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Review

Selected Worldwide Cases of Land Subsidence Due to Groundwater Withdrawal

1
Department of Civil & Environmental Engineering, University of Cyprus, 1678 Nicosia, Cyprus
2
Laboratory of Engineering Geology and Hydrogeology, Department of Geological Sciences, School of Mining and Metallurgical Engineering, National Technical University of Athens, Zographou Campus, 157 73 Athens, Greece
3
Institute of Geological Sciences, University of Bern, 3012 Bern, Switzerland
4
College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China
*
Authors to whom correspondence should be addressed.
Water 2023, 15(6), 1094; https://doi.org/10.3390/w15061094
Submission received: 2 February 2023 / Revised: 27 February 2023 / Accepted: 7 March 2023 / Published: 13 March 2023
(This article belongs to the Special Issue Risk Analysis in Landslides and Groundwater-Related Hazards)

Abstract

:
The present review paper focuses on selected cases around the world of land subsidence phenomena caused by the overexploitation of aquifers. Land subsidence is closely related to human activity. In particular, the development of technology has led to an exponential increase in industrial and agricultural production, as well as extensive urbanization, mainly in large cities. The action of those parameters, along with the effects of climate change, has led to further increases in water demands, which have mainly been served by overexploitation of the aquifers. Overexploitation, in conjunction with broader geo-tectonic conditions, can trigger severe land subsidence phenomena, resulting in significant damage affecting the physical and man-made environment. The scope of the present study is to provide a critical review of the existing literature on land subsidence due to aquifer overexploitation and highlight the main causal factors driving this process. The methods developed in the past and their outcomes hold significant importance in sustainable development strategic planning.

1. Introduction

Land subsidence is defined as an endogenous phenomenon caused by differential vertical displacements of the Earth’s surface due to either natural or anthropogenic factors [1,2,3,4]. This process is mainly affected by the hydrological, geological, and tectonic conditions of the wider area, as well as by the geotechnical characteristics of subsurface formations. Subsidence can be triggered by the consolidation of formations by overexploitation of aquifers [5,6,7] or natural gas and oil [8], sinkhole collapse [9,10,11], oxidation of organic soils [12] or the collapse of underground mining cavities [13,14,15,16].
The mechanism behind land subsidence phenomena caused by overexploitation of aquifers is based on the principle of effective stress, which states that when a saturated soil is subjected to total stress σ, this stress can be expressed by the following equation [17]:
σ = σ + u
where u is the pressure acting on the water and the granular structure, and σ′ is the effective stress supported by the granular structure only.
A decrease in the pore water pressure and an increase in the normal effective stress are aftereffects of the incidence of excessive groundwater withdrawal from aquifer systems. The evolution of this process results in the compaction of the hydrostratigraphic units, which eventually leads to land subsidence [18,19].
During the 20th century, subsidence was observed in over 150 cities worldwide [20], causing widespread problems in both the built environment and infrastructure, resulting in significant economic losses and, in some cases, the loss of human lives. More specifically, the main effects can be summarized as (1) seawater intrusion or protrusion [21,22,23,24], (2) linear network damage such as roads, irrigation and electricity networks [25]; and (3) building damage.
The management of this phenomenon is an extremely complex process with an uncertain outcome due to the fact that: (a) the first visible signs of this phenomenon tend to be recorded at times later than its initial activation; (b) it may be difficult to delineate the extent of the affected area since no sign of subsidence may be observed on the ground surface and (c) the failure mechanism is complicated by the interplay of multiple factors, making it hard to determine the extent of its impact.
The assessment of pre-event risk and post-event damage due to land subsidence is highly correlated with ground movement deformations. In terms of detecting and monitoring land subsidence phenomena, there are two prevailing techniques: (a) Geodetic surveys [26,27,28] and (b) remote sensing techniques. Regarding the former, it necessitates costly equipment and measures deformations on a point-by-point basis. It is mainly used for the accurate measurement of the deformation after the phenomenon activation. During the last two decades, Earth Observation (EO) techniques and technologies have been widely applied in land subsidence. Differential Interferometric Synthetic Aperture Radar (DInSAR) and Global Positioning System (GPS) are the most popular EO techniques with numerous applications around the world [2,3,18]. The outcome of the implementation of the DInSAR technique is based on the analysis of two different radar images gathered over the same area at different times with the same acquisition mode and properties [29].
Using these techniques, one can detect the initiation condition, the spatiotemporal fluctuations, and the extent of the affected area.
Both the activation and consequences of this geohazard are difficult to predict as they depend on factors characterized by major uncertainties, such as an area’s geological, geotechnical, and hydrogeological conditions, in addition to the influence of human activities. Numerous studies have been conducted to estimate the correlation between groundwater withdrawal and vertical deformation rates [7,18,30,31,32,33,34,35,36,37,38,39]. In general, both the extent and rate of vertical deformation are proportional to the groundwater level drop and the mechanical characteristics of the associated geological formations.
The main objectives of the study are to (a) present significant land subsidence examples in selected areas around the world (USA, Mexico, China, Japan, Indonesia, Iran, Italy, Spain, and Greece), highlighting the increasing intensity of these events; (b) understand the main causal factors driving this process and (c) empathize the valuable information which can be acquired by modern remote sensing techniques for the determination of the spatiotemporal distribution of the subsidence. Besides the fact that land subsidence has caused significant economic loses in the 20th century due to the rising water demands, the determination of the extent to which the primary causal factors contribute to this geohazard is still in its early stages on a global level. The main contribution of our study is the synoptic presentation of several selected papers that describe in detail land subsidence phenomena worldwide in such a manner that readers can independently evaluate the derived information. Our research is among the initial efforts to investigate the causal and triggering factors behind the emergence of this phenomenon. The study of historical subsidence phenomena can help local and regional competent authorities to understand the risks arising from their occurrence. This knowledge will enable them to take appropriate mitigation measures to ensure the future safe development of agricultural, tourism, housing, and other economic activities.

2. Land subsidence in the United States of America (USA)

The USA had the highest growth of any country worldwide during the 20th century. Therefore, the water requirements needed to meet its industrial and agricultural needs, as well as those of intense urbanization, were enormous. These demands have led to extensive overexploitation of aquifers and the activation of land subsidence. According to data from sites of hydrogeological interest in 1975 [40,41], aquifer overexploitation in eight of the sites exceeded 700 × 106 m3/year (south and southwestern USA), and in 30 of the sites was between 30 × 106 and 700 × 106 m3/year (south, central and western USA).

2.1. Las Vegas, Nevada

Las Vegas Valley is a rapidly growing metropolitan area. The systematic over-pumping of aquifers to meet the needs of the increasing population began in 1950 [42]. The drawdown of the aquifer in the west–north-western section of the valley exceeded 90 m during the early 1990s [43]. This situation, combined with the geo-tectonic characteristics of the area, led to the activation of land subsidence. The recorded vertical displacements in 1948, in parts of the valley, exceeded 2 m compared to data from 1935 [44], causing significant damage to roads, houses and other buildings (Figure 1).
An earlier study, which was carried out using interferometric synthetic aperture radar (InSAR) techniques for the period 1992–1997, found that the maximum vertical deformation rate was around 19 cm [45]. Moreover, it was observed that the spatial extent of the deformations was related to both the geological and tectonic structures (faults) and the thickness of the clay layers. Considering the land subsidence map for the period 1963–2000 [46], the maximum values appear to occur in the north-eastern part of Las Vegas Valley and exceed 170 cm. New studies conducted in the period 2000–2010 [47] found that the land subsidence rate has declined significantly over the last decades due to measures that were taken to reduce aquifer overexploitation, which led to an increase in the groundwater level.
Figure 1. (A) drill pipes lifting, (B) Damaging house in the Windsor Park District due to land subsidence [48].
Figure 1. (A) drill pipes lifting, (B) Damaging house in the Windsor Park District due to land subsidence [48].
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2.2. San Joaquin Valley, California

The San Joaquin Valley in California is one of the world’s largest agricultural areas [49]. Therefore, its water supply demands are a key priority for local authorities. Aquifer overexploitation has led to extensive land subsidence across the valley [25]. An area of 13,000 km2 has vertical deformation values of at least 0.3 m [50,51]. Notably, the maximum recorded land subsidence value in this area is almost 9 m [52] (Figure 2).
To address this phenomenon, local authorities conducted surface water inflow projects in the late 1960s, resulting in reduced demand for groundwater. Since the end of 1971, the annual land subsidence rate has been reduced by 50–70%. However, the intense droughts between 1976–1977, 1990–1994, 2007–2010, and 2012–2017 significantly reduced surface water inflow and increased overexploitation of the aquifer. This situation resulted in an increase in land subsidence rates, reaching values observed before the construction of surface water inflow projects [53,54]. A recent study compared data on groundwater level and vertical land motion and evaluated that 0.5–1.5 years are required for groundwater level in aquitard and aquifer units to equilibrate. However, during this period, residual compaction of aquitards and land subsidence continues beyond the drought period [55].
Figure 2. The maximum vertical deformations in the San Joaquin Valley, California. The signs on the column were placed at the approximate former altitudes of the earth’s surface between 1925 and 1977 [56].
Figure 2. The maximum vertical deformations in the San Joaquin Valley, California. The signs on the column were placed at the approximate former altitudes of the earth’s surface between 1925 and 1977 [56].
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2.3. Long Beach Area, California

The Long Beach area of California represents the most important example of oil extraction-induced land subsidence. Since the onset of oil extraction in this area in the early 1940s, land subsidence has been observed. The maximum subsidence value was recorded in the Wilmington area and reached 8.8 m [8]. As a result, seawater inundation of inland areas has occurred, causing significant damage (Figure 3). Researchers determined that to deal with this phenomenon, and it was necessary to restore the volume of the extracted oil by injecting water back into the wells. However, this method, despite its high cost, did not yield the expected results.

2.4. Santa Clara Valley, California

The first land subsidence phenomena due to aquifer overexploitation in the United States were recorded in California’s Santa Clara Valley [58]. During the first half of the 20th century, agricultural activities intensified. After the Second World War, during the period 1945–1970, rapid population growth changed the local economy from primarily rural-based to industrial and urban. The evolution of land subsidence is closely linked to the primary factors that affect the pumping of groundwater, such as population growth, land use change and surface water inflow [59].
The maximum land subsidence values occurred in San Jose (4 m) between 1910 and 1995. This phenomenon was more intense in the northern part of the valley near the San Francisco Bay area. An area of approximately 44 km2 experienced land subsidence in the range of 0.5–2.5 m, resulting in substantially increased flooding risk [60].
An economic study [61] estimated that the direct cost of the land subsidence phenomenon in this area was over $131.1 million in 1979 and $332 million in 2003. This amount includes the cost of constructing embankments around the southern part of San Francisco Bay, maintenance of existing embankments, elevation of the railway and road network, increasing the sewage capacity and constructing pumping stations. Notably, approximately 1000 water wells were damaged or destroyed during the period 1960–1965 due to land subsidence.

2.5. The City of Houston, Texas

The largest urban area in the United States affected by land subsidence is the metropolitan city of Houston in Texas. The city was established in 1836 as a commercial city from which steamers transported goods to the southeast. Aquifer exploitation to meet domestic and agricultural needs began in the late 1880s. The opening of the waterway channel in 1914 made Houston one of the largest ports in the United States. The area’s industry grew significantly during the Second World War, resulting in an increase in the population. To address the problem of aquifer overexploitation, surface water channels were created in the central and eastern districts of Houston. However, recent urban development towards the north and west of the city continues to be based on aquifer exploitation [59,62].
Based on previous studies, land subsidence exceeding 0.3 m was observed over an area of more than 8000 km2 until 1979. The highest deformation values, reaching up to 3 m, occurred in the Pasadena area (Figure 4). After the inflow of surface water in the east of Houston commenced at the end of the 1970s, vertical deformation rates decreased significantly [63]. According to vertical displacement data for the period 1906–1995, the city’s intense urbanization appears to have shifted the subsidence phenomenon from the bay to the inland areas to the north and west of Houston [64,65].
The regulations for reducing groundwater withdrawal [66] have been enacted as a result of the need to mitigate vertical displacements. In addition, land subsidence is likely to continue throughout the 21st century [67]. Vertical deformation values exceeding 49 mm/year (using the Advanced Land Observation Satellite) and 34 mm/year (using the Sentinel-1A/B satellite) were recorded in the periods July 2007 to January 2011 and December 2015 to August 2017, respectively, affecting significant parts of the Houston area [68].
Figure 4. Land subsidence in the area of Pasadena [69].
Figure 4. Land subsidence in the area of Pasadena [69].
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2.6. Arizona

Land subsidence in central and southern Arizona was first recorded during the 1940s, primarily in rural areas [70]. This subsidence was driven by systematic over pumping of the aquifer, which led to a significant water level drop exceeding 150 m [71,72]. Notably, vertical displacements in this area exceeded 5.7 m both in the western part of Phoenix, near the Air Force Base, between 1957–1991 [73] and in the Eloy region between 1948–1985 [74]. The Arizona Water Resources Department has monitored vertical displacements in this region since 2002 using InSAR techniques and has identified more than 25 areas that have suffered from land subsidence, covering an area exceeding 7300 km2 [75]. These have since been expanded to encompass more than 26 individual land subsidence areas, covering an area exceeding 7500 km2 [76]. This land subsidence has also led to the formation of extensive surface ruptures (Figure 5). Their size varies and may exceed 3 m in width and 10 m in depth [77]. The Arizona Geological Survey (AZGS) has mapped more than 251 km of surface ruptures since 2007 [78]; this number had exceeded 273 km by 2017. Overall, the current trends in the evolution of vertical displacements and surface ruptures in this area demonstrate that this geohazard is still ongoing and will likely continue into at least the near future.

3. Land Subsidence in Mexico

In recent decades, urban development in several Mexican cities, combined with intensive agricultural activity, has caused land subsidence [81]. The pumping of the aquifers provided 70% of the water needs of 122.3 million of Mexico’s inhabitants in 2013 [82], leading to a significant water level drop and consolidation of compressible subsurface formations [83]. This phenomenon affects a significant part of the country. According to recent research that was conducted using InSAR techniques for the period 2007–2011 [84], 21 different regions were identified as experiencing land subsidence. The phenomenon is more intense in Mexico City, where vertical displacements of over 30 cm/year were recorded, whereas vertical movements in other districts did not exceed 5–10 cm/year. Some examples are as follows.

3.1. Mexico City

Mexico City, with a population of 9 million, is the most important economic, industrial and cultural center of the country. This city is located over alluvial deposits, and land subsidence began to appear in the late 18th century [85]. The groundwater level drop of around 1 m/year has caused vertical displacements of up to 40 cm/year. During the past 100 years, the total vertical displacements in the center of the city reached values of up to 7.5 m [86]. As a result (Figure 6), extensive damages have been identified in urban infrastructure and transportation and drainage networks [87,88,89,90,91,92,93]. To address this issue, the local authorities required the use of deeper foundations for major constructions, including the use of piles.
Several surveys have been conducted to determine the evolution and rate of vertical displacements in Mexico City. Initial studies were based on geodetic measurements [96] and piezometers [97,98], whereas more modern research has used GPS [88] and InSAR techniques [36,88,99,100,101,102,103,104,105]. The first studies recorded land subsidence of up to 50 cm/year in the historical area and the city center (1940–1960), while later studies (2002–2007) identified lower vertical displacements reaching values up to 30–35 cm/year in the eastern and central parts of the city. The evolution of the phenomenon to date is confirmed by multiple studies conducted using Earth observation techniques or GPS leveling measurements [106,107,108]. These studies confirm that the vertical displacements between 2014 and 2020 have reached 39 cm/year [109], increasing the number of people living in zones at high to very high risk to 1.5 million.

3.2. The State of Sonora

The state of Sonora is in the northwestern part of Mexico, and since 1960, its aquifer has been overexploited. According to surveys in 1993 [110], the pumping of groundwater was three times larger than the inflow of water into the aquifer due to the low cost of pumping. This has resulted in the salinization of the aquifer, causing significant damage to 8000 hectares of irrigated land.

3.3. Celaya

Celaya is the third-most populated city in Mexico’s Guanajuato region, with a population of 300,000 inhabitants (as of 2005). In recent decades, the total pumping of its aquifer has increased gradually; in 1985, pumping occurred at a rate of 538 × 106 m3/year; in 2004, it reached 593 × 106 m3/year, and in 2008 it approached 600 × 106 m3/year [111]. As a result, the overall groundwater level drop for the period 1956–2008 reached 90 m [112]. Using data from Envisat and InSAR techniques for the period 2003–2006, land subsidence was observed in the center of the city at rates ranging from 2–3 cm/year [113,114] to 7–10 cm/year [115]. During the period 2007–2011 [84], the vertical displacements approached 9 cm/year, while for the period 2012–2014, the average value was 4–6 cm/year [116]. All of the aforementioned land subsidence has caused significant damage to the buildings and infrastructures of this city [117].

3.4. Morelia City

Morelia is the capital and largest city of the Michoacán state in central Mexico. The expansion of the city (by an average of 1.8 km2/year between 1975 and 2020) has led to groundwater overexploitation and triggered land subsidence, causing significant damage to houses and infrastructure [118]. To constrain the patterns and rates of subsidence, this area has been investigated using satellite observations [84,114,115,116,119,120]. All the studies have consistently found that the maximum vertical displacements are taking place in the northern part of the area. The vertical displacement rates have been estimated at 3.5 cm/year for the period 2003–2006 [114,115] and 7–8 cm/year for the period 2003–2010 (Figure 7) [119,120], 7 cm/year for 2007–2011 [84], 4–6 cm/year for 2012–2014 [116] and 2.74 cm/year for 2014–2017 [121]. Additionally, a recent study that used Earth observation techniques estimated subsidence rates up to 9 cm/year between 2014 and 2021 [122].

3.5. The City of San Luis Potosi

San Luis Potosi is located in north–central Mexico and has also suffered from the land subsidence phenomenon. Specifically, in the cities of San Luis Potosi and Soledad de Graciano Sanchez, land subsidence became visible during the 1990s and caused significant damage to sidewalks and sewer pipes, as well as generating cracks in the walls and roofs of buildings [123].

4. Land Subsidence in China

Since the mid-20th century, China has experienced rapid agricultural and industrial growth. Consequently, the water demands to meet industrial, agricultural and urban needs have increased. Statistical data [124] show that 164 different regions with a total extent of 181,300 km2 have been overexploited. The areas with the highest over-pumping levels occupy 77,000 km2, i.e., 42.5% of the total overexploited region. According to groundwater monitoring systems in 17 provinces of North China (with a total extent of 750,000 km2), the total groundwater reserves decreased by 15.1 billion m3 between 2001 and 2002. Generally, from 1994 to 2002, the groundwater reserves in North China decreased consistently, with some fluctuations between 1994 and 1998. The largest decreases were recorded in 1997 (17 billion m3) and 2001 (20 billion m3) [125].
Land subsidence due to aquifer level drops had been observed in 90 cities by 2005; of these, 80% are located in areas along the coastal zone [126]. A total area of approximately 70,000 km2 is affected by these phenomena [32]. In recent years, the areas with land subsidence greater than 200 mm increased from 79,000 km2 in 2009 to 90,000 km2 in 2012 [127].
As noted above, this phenomenon is located both along the coastal urban area [127,128,129,130,131,132] and within urban cities such as Shanghai [128,133,134], Tianjin [135,136,137], Taiyuan [138], Suzhou [139,140], Cangzhou [141] and Beijing [142], as well as in cities located within the Delta of Yangtze Suzhou River such as Wuxi and Changzhou [143]. Some examples of this phenomenon are as follows.

4.1. Shanghai

China’s largest city, with a population of 24 million, is located on the estuary of the Yangtze River. The aquifer, which occurs within Quaternary deposits, has a thickness ranging from 200 to 300 m. According to historical data, groundwater pumping first took place in 1860, with the first subsidence recorded in 1921 [134]. The exploitation of the aquifer continued, reaching 2 m3/s in 1962, and, as a result, the rates of vertical displacement increased. By 2005, the average vertical displacements in the urban area reached 1.92 m, while the maximum values were as high as 2.9 m [134].
In terms of planning, the latest regulations for managing land subsidence in Shanghai were approved in 2013. Relying on these regulations, land subsidence across the entire administrative region has been reduced to around 5 mm per year [144]. However, vertical displacements of up to 26 mm/year were observed in the districts of Fengxian, southern Jinshan and Songjiang for the period between January 2018 and March 2020 [145], thus highlighting that the area is still subsidence-prone, causing significant problems in the city.

4.2. The Cities of Suzhou City, Wuxi City and Changzhou City

These cities are located southwest of Shanghai along the Yangtse River. They overlie Quaternary deposits with a thickness of 150–220 m that thicken from the west to the east and from the south to the north [139]. The first land subsidence phenomena were observed in this area in the 1960s. In recent decades, the total area with a vertical deformation exceeding 20 cm approached 6000 km2. The maximum subsidence values of 84.2 cm have been recorded in Jiaxin City [146].

4.3. Beijing

Beijing is the capital of China and the second-largest city in terms of population (14.5 million). Two-thirds of its drinking water and its industrial water supply are both derived from its aquifer, with the annual water pumping volume exceeding 25 × 108 m3 [142]. The first land subsidence was recorded in 1935 [126]. Concurrent with the industrial development of the city to the east in the period 1955–1983, the vertical displacements increased to rates of 16–28 mm/year [147]. Measures taken by the government between the 1980s and 1990s succeed in mitigating this phenomenon. However, since 1999, the combination of prolonged drought and rising water demand has led to re-overexploitation of the aquifer and reactivation of the subsidence phenomenon. As a result, the average vertical displacements rates during 1999–2009 were 15–25 mm/year, with the highest value observed in 2009 (137 mm/year).
The maximum land subsidence rate during the period 1935–2009 reached 1163 mm [148] and 1980 mm over the past three decades (1992–2022) [149]. According to data collected in 2012 [147], two-thirds of the Beijing plain was affected by land subsidence. An area of 2996 km2 experienced total vertical displacements exceeding 10 mm; in addition, an area of 1538 km2 experienced total land subsidence exceeding 30 mm and an area of 50 km2 experienced total vertical displacements exceeding 500 mm [150].
The South-to-North Water Diversion Project (which was created in 2015) significantly changed the area’s land subsidence trends. Specifically, two years after the outset of this project, the area with land subsidence decreased from 79% to 60%, while the maximum vertical displacement rate decreased from 141 mm/year [151] to 135 mm/year [152].

4.4. Tianjin City

Tianjin city is a major industrial city located along the Bohai coast to the west of the Pacific Ocean with a population of 7.5 million. This city overlies Quaternary deposits with a thickness varying from 100 to 330 m in the north and from 300 to 430 m in the south of the area [136]. The first recorded land subsidence was in 1923 [126] and resulted from the combined effect of the aquifer level drop and the area’s tectonic structure. The phenomenon intensified during the period 1966–1985 when the volume of pumped water reached 1 × 108 m3/year [131]. The average vertical displacement rate in this city was 26 mm/year for the period 2011–2012. The area with land subsidence greater than or equal to 10 mm in 2013 occupied 7838 km2. In addition, the extent of land subsidence with values greater than or equal to 50 mm was close to 1637 km2 [127], and the area in which the vertical displacements exceeded 50 cm reached 7270 km2 [150,153]. The maximum recorded vertical displacement values in this area exceed 3.1 m [20,126]. Thus, given the area’s location and low elevation, the ground surface is below sea level in the coastal zones, resulting in significant damage to infrastructure. Numerous pump stations have been constructed to prevent the intrusion of seawater within the urban area (Figure 8).
Recent studies have highlighted that the subsidence rate has increased significantly over time. In detail, the average vertical displacement rate has increased from 2.4 cm/year for the period 2010–2014 to around 5 cm/for the period 2015–2019 [154,155].
Figure 8. Land subsidence in the area of Tianjin city. (A) An increase in the height of the embarkments due to land subsidence 1995 and 1998 1998 Governance Section. (B) Damage to the water supply system [156].
Figure 8. Land subsidence in the area of Tianjin city. (A) An increase in the height of the embarkments due to land subsidence 1995 and 1998 1998 Governance Section. (B) Damage to the water supply system [156].
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4.5. Hebei Province

Hebei Province is located to the west of Bohai Bay (Yellow Sea), and its population is 71 million. This area is founded on Quaternary formations with thicknesses varying from 300 to 580 m [157]. The first land subsidence deformation was recorded in Handan in 1960, and in recent decades, the phenomenon has expanded to affect an area of 70,000 km2, equivalent to 97% of the province. The total area for the year 2013, in which vertical displacements were greater than or equal to 50 mm, was close to 11,400 km2 [127]. In addition, land subsidence exceeding 50 cm affects an area of 6430 km2 [150]. During the 1990s, an area of 337.9 km2 was identified in which the vertical displacements were more than 1 m [153]. The largest subsidence values for the period 1970–2013 reached 2.68 m and were recorded in Cangzhou. In addition to land subsidence, surface ruptures have also been observed in the Hebei Province: according to recorded data, 228 surface ruptures were detected in 1989, 402 in 1993, 482 in 2000, and 839 in 2013 [158].

4.6. The City of Shian

The city of Shian is built on the southern part of the Lóane plain and has a population of almost 8.5 million. It is located on Quaternary formations whose thickness varies from 300 to 1000 m [159]. The first land subsidence phenomena were recorded in the late 1950s, while surface ruptures occurred after 1976. The major MW 7.6 earthquake on 28th July 1976 resulted in an increase in the number of surface raptures [139,160].

5. Japan

The rapid concentration of population in the urban centers of Asian coastal cities has resulted in the overexploitation of aquifers and caused significant problems, such as land subsidence and water salination [161,162]. This phenomenon is particularly intense in Japan’s major cities such as Tokyo [163], Osaka and Nagoya, where land subsidence was observed in the period 1950–1970 [164]. A few representative examples are as follows.

5.1. Kanto–Tokyo Plain

The Kanto Plain is located in central Japan and covers an area of approximately 16,000 km2. Tokyo city, with a population of 13.1 million people (2011), is the largest urban area in Japan and is located in the southern part of the plain. Tokyo’s first water supply system was established in 1913 [165]; subsequently, numerous wells have been drilled to meet the city’s needs. Pumping activities increased dramatically during the economic growth of the 1950s and 1960s; for example, pumping in the eastern part of the city increased to 1 million m3/day [166]. However, over-pumping of the aquifer has caused severe land subsidence. The maximum values reached 23.89 cm/yr in 1968 in the area of Edogawaw-Ku [167]. To reduce the impacts of this phenomenon, the Japanese government established rigorous laws in 1957, and, as a result, pumping in eastern Tokyo decreased from 800 mm/year in 1960 to 100 mm/year in 1980 [168].

5.2. Nobi Plain

The Nobi Plain is located in central Japan and occupies an area of approximately 1800 km2. It is one of the country’s most densely populated areas, with 1000 inhabitants/km2 [169]. In the 1920s, the groundwater level was close to the surface [170]. However, since 1945, there has been a dramatic increase in the pumping of the aquifer to meet industrial and agricultural needs. This situation led to groundwater drawdown and the onset of land subsidence. This phenomenon increased exponentially in the following years, with vertical displacements exceeding 20 cm recorded in 1973 [171].
Strict pumping regulations that were introduced successfully mitigated the negative consequences of this phenomenon—the area in which the rates of vertical displacement exceeded 1 cm decreased from 283 km2 in 1975 to 9 km2 in 2004 [172]. In addition, the earth’s surface in some places, such as Gocho and Matsunaka, in the east–southeast of the plain, was uplifted by 20–25 mm [172].

6. Indonesia

Many Indonesian cities, such as Jakarta, Bandung, and Semarang, have been affected by land subsidence due to aquifer overexploitation. This phenomenon has caused extensive damage to buildings and infrastructure and flooding in coastal areas.

6.1. The City of Jakarta

Jakarta, the Indonesian capital, has a population approaching 8.7 million people (2004) and requires large volumes of water to meet its urban and industrial needs. This situation has resulted in aquifer overexploitation and the onset of land subsidence [26,173,174]. According to GPS measurements and InSAR techniques, for the period 1982–2011, vertical displacements ranging from 1 to 15 cm/year were widely observed, with some higher values reaching 20 to 28 cm/year [175]. The maximum land subsidence values are observed mainly in the coastal area, which exceeded 4.1 m during the period 1974–2010 (Figure 9). The ongoing subsidence trend in the coastal area is confirmed by a recent study that identified vertical displacement rates of around 30 to 40 mm/year between March 2017 and April 2020 [176].

6.2. Semarang

Semarang is a city that covers approximately 373.7 km2 and is located in the northern part of the province of Java, with a population approaching 1.5 million inhabitants (2010). In this city, during the early 1990s, intense urbanization occurred, particularly in the northern coastal zones [178]. Large volumes of groundwater were pumped to cover the needs of the population, industry and commercial activities [178]; specifically, the total volume of pumped groundwater increased from 23 million m3 in 1990 to 38 million m3 in 2000 [179]. However, this systematic overexploitation caused severe land subsidence phenomena [23,180], which have become gradually larger over time [181]. The vertical displacements, according to InSAR data, varied from 8 cm/year during 2007–2009 [179] to around 15 cm/year (in specific areas) during 2015–2017 [182]. In the case of coastal cities such as Jakarta and Semarang (Figure 10), land subsidence also leads to the phenomenon of severe flooding [23].

6.3. Bandung

Bandung, the capital of the Java province, has a population of 2.4 million inhabitants. In this area of Indonesia, land subsidence has been observed due to groundwater overexploitation [184,185,186]. Studies conducted between 2000 and 2011 indicate that this area has suffered from vertical deformations with an average annual rate of 8 cm/year [175]. These values have since increased to 10–12 cm/year for the period 2015–2017 [187].

7. Iran

In Iran, land subsidence due to aquifer over-pumping of the aquifer has been observed in the cities of Tehran, Mashhad, Kashmar, Varamin, Kashan and Rafsanjan [188]. Tehran, with a population of 9.1 million, is the capital of Iran; the average altitude of the city is 1191 m, while the Tehran basin occupies an area of 2250 km2. This area has undergone intense urbanization in addition to significant agricultural and industrial activities, resulting in large water needs. Systematic aquifer overexploitation has led to significant groundwater level drops; between 1984 and 1991, the level drop reached 4 m, from 1995 to 2004, it was 6 m, and for the period 2007–2012, a further 1.65 m water drop occurred. Notably, small periodic variations in aquifer level were observed during the years 1991–1995 and 2005–2006. Therefore, the overall water level drop for the period of 28 years was 11.65 m, i.e., 42 cm/year [189]. This aquifer overexploitation has also resulted in land subsidence, with the first vertical displacements recorded in 1990 [190]. The maximum values recorded in 2004–2008 exceeded 200 mm/year [191], while the cumulative vertical displacements reached 39.6 cm in 2004–2010 and 88.4 cm in 2014–2017 [192]. These high subsidence rates have caused damage to settlements, roads and infrastructure (Figure 11).

8. Italy

8.1. Venice

The phenomenon of land subsidence in the Venice region is more complex than in the other examples discussed so far. In addition to land subsidence induced by the groundwater level drop, the sea level in the Venetian Lagoon has increased due to climate change. During the past century, the vertical displacements relative to sea level reached 23 cm. Of this value, 12 cm can be attributed to land subsidence due to natural (3 cm) or anthropogenic (9 cm) causes, while 11 cm can be attributed to sea level rise [194]. The resulting increase in flooding has led to both direct and indirect damage, causing significant concern to local authorities. Overpumping of the aquifer in this area is related to the creation of the first industrial plants in the 1930s, with the maximum over-pumping rates recorded in the period 1950–1970. This scenario resulted in land subsidence along the Marghera industrial zone (7 mm/year), the southern part of the lagoon (6 mm/year), the city of Venice (5 mm/year) and the northeast border area of the lagoon (2 mm/year) during the period 1952–1968. The highest values were measured between 1968 and 1969 in the Marghera industrial zone (17 mm) and the city of Venice (14 mm) [195]. Local authorities implemented measures to reduce industrial overexploitation of the aquifer in 1970; these measures resulted in the rapid recovery of the aquifer and an increase in its groundwater level. As confirmed by measurements, the phenomenon of land subsidence was eliminated in 1973 [196,197]. Taking into account measurements that were acquired between 1973 and 1993, the stability of the inland area was confirmed, however, decreases of 1–2 mm/year along the coastline and in the north and south areas of the city were recorded [198,199,200]. Given that the Adriatic Sea level increased by 1.23  ±  0.13 mm/year from 1872 to 2019 (after removing the effects of subsidence) [201], Venice city continues to face the joint problem of land subsidence taking place at the ends of the lagoon combined with rising sea level due to climate change.

8.2. Ravenna

The Ravenna area is in northern Italy in the south-eastern part of the Padou river and covers an area of approximately 38,000 km2. Over the last century, extensive land subsidence has been recorded in this area due to both natural and anthropogenic factors. From 1897 to the Second World War, the average vertical displacement rate was 5 mm/year. After the Second World War, intense industrial growth combined with the extraction of natural gas led to the overexploitation of the aquifer. This situation has resulted in a significant increase in vertical displacement values, with values reaching 110 mm/year recorded in 1972–1973 [202,203]. To combat this issue, the state took strict measures, and the phenomenon was reduced. Notably, the overall vertical deformation for an area covering around a third of Ravenna (including the city and a significant part of the coastal zone) is close to 1 m. In an area covering 10 km2 between the historic center and the coastline, the maximum subsidence values exceed 1.6 m. In recent decades, the subsidence phenomenon in the mainland has significantly decreased; however, some coastal areas continue to subside at a rate of around 10 mm/year [204].

8.3. Bologna Region

During recent decades, significant land subsidence has been observed in the Bologna region. This city is situated on Holocene and Middle Pleistocene deposits with a total thickness of 400 m. Considering previous research that was conducted for the period 1974–1981, the vertical deformation rate due to the overexploitation of the aquifer exceeded 11 cm/year. According to recent studies [205], this rate (due to policy changes) appears to exhibit a consistently decreasing trend with seasonal variations.

9. Spain

In Spain, intensive overexploitation affected 77 aquifers [86], most of which are located in the southeast of the country. The water needs for Spain’s agriculture and tourism are rising in the summer months when water availability is lower and, in general, the demand exceeds the available water supply [206]. A typical example of this situation is the city of Murcia, which is located on the bank of the Segura River in south-eastern Spain. In this area, aquifer over pumping has caused severe land subsidence, damaging both infrastructure and city buildings. According to a previous study [207] using satellite systems (TerraSAR-X), for the period between July 2008 and September 2009, a subsidence rate of 5 mm/year was observed in this area, with maximum recorded subsidence values of 35 mm/year.

10. Greece

10.1. Kalochori, Thessaloniki

In the village of Kalochori [1,2,208,209,210,211], rapid industrial development in the early 1960s, combined with extensive aquifer over-pumping by the Water Company of Thessaloniki, led to a significant water level drop in the aquifer which, over time, has reached a magnitude of 40 m [210,212]. Researchers suggest that aquifer drawdown has resulted in the consolidation of the underlying alluvial deposits in this area and the onset of land subsidence. The vertical displacements recorded over the last 50 years have reached 3 to 4 m [1]. The maximum recorded deformation occurs in areas where the thickness values of the Quaternary deposits are higher, highlighting the important role of the thickness of these formations in determining their geotechnical behavior [2]. Notably, due to the smooth stratification in this area, no surface ruptures have been observed. However, this phenomenon has caused significant damage in the form of seawater intrusion—currently, the inland areas are located 4 m below sea level, and embankments have been built to protect the village from flooding.

10.2. Anthemounda Valley, Thessaloniki

In Anthemounda Valley [4], the increase in water pumping to meet urban, tourist and industrial needs has led to the consolidation of Neogene and Quaternary deposits and the onset of land subsidence. Due to the area’s tectonic structure, subsidence has been observed along the coastal zone of the basin in the Peraia area, causing damage to various houses [213]. Similar phenomena have also been recorded in the vicinity of Thessaloniki International Airport. The correlation between decreasing groundwater levels and vertical deformation has been confirmed by recent studies conducted using InSAR satellite technology [2,4]. More specifically, between April 1995 and June 2001, small displacement rates were observed in the coastal zone of the Peraia settlement, with average values ranging from −1.5 to +1.5 mm/year. In contrast, deformation rates recorded in Ano Peraia were much larger, ranging from −10 to −15 mm/year. Recent studies based on Sentinel-1 data (during the years 2015–2019) indicate that vertical displacements are still ongoing throughout the entire basin [214].

10.3. East Larisa Plain

In East Larisa Plain [215,216,217,218,219], systematic aquifer overexploitation to meet agricultural needs has led to a significant groundwater level drop of 50 m over a 20-year period (1981–2001) [220] and the onset of land subsidence since 1986. The occurrence of this phenomenon in areas where the thickness of the alluvial deposits varies significantly (both in the margins and the central part of the plain) has resulted in the formation of surface ruptures. The subsidence phenomenon has also caused considerable damage to villages, farmland and roads. According to a recent InSAR-based study [218], the area exhibits both uplift and subsidence processes with annual rates of up to −2.9 and 6.6 mm/year, respectively, for the years 1995–2008. While some of these changes can be attributed to tectonic movements, there is also a continuous deformation mechanism that correlates strongly with recorded groundwater level changes in this area.

10.4. West Larisa Plain

In West Larisa Plain, the combination of the presence of alluvial formations and aquifer drawdown has resulted in extensive land subsidence that has been observed since 1980 [221]. This phenomenon, due to the area’s tectonic structure (presence of active faults), has caused surface ruptures that have damaged the settlements of Farsala and Stavros.

10.5. Thriasio Basin

In the Thriasio basin, which is located 25 km west of the capital of Greece, systematic overexploitation of the aquifer during recent decades to meet the agricultural, industrial and urban needs has led to a significant groundwater level drop and the onset of land subsidence. According to a recent study [222] based on the Persistent Scatter Interferometry (PSI) technique, vertical displacement ranging from −3 mm/year to −10 mm/year was observed for the period between May 1992 and November 2003. These rates reached −3.5 to −5  mm/year (based on Interferometric Point Target Analysis) for the period 2002–2010 [223].

10.6. Amyntaio Basin

In the Amyntaio basin, the systematic over-pumping of the aquifer during the last decades, from both the Amyntaio open pit coalmine (to protect the slopes of the mine) and the wells for irrigation purposes, led to a significant drop level of the aquifer which reaches 70 m [224,225,226]. This drawdown has resulted in the consolidation of Quaternary deposits and the occurrence of land subsidence and surface ruptures damaging villages and infrastructure (Figure 12). The highest values of vertical displacements, which reached 1.5 m, were observed in areas near the mine. It is worth mentioning that the phenomena were so intense that it was necessary to relocate the settlement of Anargiroi.

11. Discussion

Land subsidence caused by aquifer overexploitation is a widespread geohazard that has affected significant areas around the world since the early 20th century [227]. The failure mechanism of this phenomenon is complex and depends on the combined action of multiple factors, geological, hydro-geological, morphological, and tectonic settings, and human activities, whereas its intensity is strongly related to aquifer level drops [228,229,230]. Thus, to manage the risk arising from this phenomenon, it is necessary to understand the geological and tectonic structure of the research area and the geotechnical characteristics of its underlying formations, as well as the impact of anthropogenic activities. The objective of the review paper was to present significant cases of land subsidence due to aquifer exploitation to identify factors that contribute significantly to the occurrence and evolution of the phenomena. In contrast to most review studies, our paper presents the screened papers in sufficient detail so that the reader can derive as much information as possible about the manifestation and evolution of the land subsidence phenomenon in the research area. This allows the independent evaluation of the relevant papers also from the side of the reader. Table 1 summarizes the present cases with details concerning the cause of overexploitation, and the resulting vertical displacements, whereas Figure 13 illustrates the distribution of the data.
For most of the presented cases, land subsidence phenomena occur mainly in flat areas where unconsolidated sediments accumulate in alluvial basins or coastal plains and in urban or agricultural areas characterized by prolonged dry periods. In addition to the water resource requirements of industry, agricultural needs are particularly high and participate to a large extent in the overexploitation of aquifers. Over 48% of the studied cases concern land subsidence phenomena induced by groundwater extraction for industrial needs and over 40% for agricultural demands. Oil extraction and mining activities are also responsible for severe land subsidence phenomena that may affect a large portion of settlements, such as the cases in Long Beach in California, USA and Amyntaio plain, Greece [8,224,225,226]. Furthermore, land subsidence evolves in water-stressed basins, resulting in groundwater depletion and compaction of susceptible aquifer systems. From the present study, it has been derived that maximum recorded deformation occurs in areas with considerable thickness in alluvial deposits, which highlights the important role of the thickness of these formations in determining their geotechnical behavior [2,224,225,226]. Most of the observed land subsidence occurs in highly populated areas. Characteristic examples are Shanghai and Beijing in China [145,147] and Mexico City in Mexico [96,102,109], which have a long history of land subsidence phenomena induced by over-pumping and dewatering processes because of increased domestic water demand. According to Herrera et al. [231], about 22% of the world’s major cities are in areas characterized as potential subsidence areas. Figure 14 illustrates the global spatial distribution of annual groundwater withdrawal (km3/y) and the percentage of areas equipped for irrigation with groundwater. Those areas that heavily depend on groundwater resources are areas with high numbers of land subsidence occurrences. Therefore, those areas might be potential areas of land subsidence in the future.
Another point that should be highlighted is the fact that in coastal areas that are subject to land subsidence phenomena, the sea level rise may enhance the negative effects of land subsidence in the man-made and natural environment. Jakarta and Semarang in Indonesia, Venice and Ravenna in Italy, and Shanghai in China are cases where the sea level rise has a significant contribution to the recorded damages [23,145,201,202,203]. In most cases, the establishment of optimized aquifer exploitation plans and strict regulations had a positive effect on the displacement rate, with a significant decrease in land subsidence phenomena in Shanghai and Beijing (China), Kanto and Nobi (Japan), Ravenna and Bologna region (Italy) [144,151,152,168,172,202,203,205]. In other cases, aquifer exploitation plans fail, resulting in the continuation of the phenomena, proving in practice the complexity of the mechanism responsible for the occurrence and evolution of land subsidence [145,201,204]. Field investigations (geological, topographic, geodetic surveys, and global positioning system) were the main investigation tool until the 90s [2,4,45,68,84,114,115,145,149,176,182,187,191,207], whereas remote sensing techniques were the main tool afterward [233,234,235]. According to Ciampalini et al. [236], traditional ground-based monitoring methods are time-consuming, labor-intensive, and costly, whereas remotely-sensed techniques are more efficient and powerful. Satellite and radar measurements that are obtained from remote sensing techniques prove to be highly accurate, with near-real-time tracking and millimeter accuracy. From our analysis, it was concluded that many studies involve the usage of both geodetic and remote sensing techniques [109,127,154,155,175,194,195,218].

12. Concluding Remarks

The first visible signs of this phenomenon tend to be recorded at times later than its initial activation, thus making the management of land subsidence phenomena a difficult, if not irreversible, situation. In addition, it may be difficult to delineate the extent of the affected area since no sign of subsidence may be observed on the ground surface. The existence of these disadvantages makes the management of this phenomenon an extremely complex process with an uncertain outcome in the context of a future safe development plan. However, despite these issues, modern remote sensing techniques can provide valuable information about the spatiotemporal distribution of the subsidence phenomenon and can help to address these disadvantages. For this reason, it is vital to monitor areas that may be affected by land subsidence using these techniques before further development of agricultural, tourist, residential, industrial or any other socio-economic activities. By adopting this approach, the vertical displacements caused by the overexploitation of the underlaying aquifer will be immediately noticed, allowing government and regional agencies to take all the necessary mitigation measures to ensure the safe and sustainable development of society and the environment. In our study, despite the review of several papers that constitute some of the most well-documented work about land subsidence, an additional number of studies could be added to cover different areas around the world. Cases from Africa, North America and Oceania are not included in the present study. Future efforts could involve analyzing a greater number of areas affected by land subsidence phenomena and establishing a closer look at the hidden relations between groundwater fluctuations, displacement rates and geo-environmental settings.

Author Contributions

Conceptualization, P.T. (Ploutarchos Tzampoglou) and P.T. (Paraskevas Tsangaratos); methodology, P.T. (Ploutarchos Tzampoglou) and W.C.; writing—original draft preparation, P.T. (Ploutarchos Tzampoglou); writing—review and editing, I.I., K.K., P.T. (Paraskevas Tsangaratos), X.Z. and W.C.; supervision, P.T. (Paraskevas Tsangaratos); All authors have read and agreed to the published version of the manuscript.

Funding

This research received no external funding.

Data Availability Statement

Not applicable.

Conflicts of Interest

The author declares no conflict of interest.

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Figure 3. (A,B) Seawater rushes over the mainland in the Long Beach area, California, (C). Water injections [57].
Figure 3. (A,B) Seawater rushes over the mainland in the Long Beach area, California, (C). Water injections [57].
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Figure 5. The effects of land subsidence in the area of Arizona. (A) Max vertical deformation reached 75 cm between 1940–1950 [79]. (B) Surface ruptures were reopened after a major rain in August 2005 [77]. (C) Surface ruptures [80].
Figure 5. The effects of land subsidence in the area of Arizona. (A) Max vertical deformation reached 75 cm between 1940–1950 [79]. (B) Surface ruptures were reopened after a major rain in August 2005 [77]. (C) Surface ruptures [80].
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Figure 6. Damage due to land subsidence in Mexico City. (A) Vertical differential deformation [94]. (B,C) Damage to infrastructure [95].
Figure 6. Damage due to land subsidence in Mexico City. (A) Vertical differential deformation [94]. (B,C) Damage to infrastructure [95].
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Figure 7. Vertical deformation rate in Morelia between 2003–2010 using PSI analysis of ENVISAT images [119].
Figure 7. Vertical deformation rate in Morelia between 2003–2010 using PSI analysis of ENVISAT images [119].
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Figure 9. Land subsidence due to the overexploitation of the aquifer between 1974–2010 in Jakarta, Indonesia [177].
Figure 9. Land subsidence due to the overexploitation of the aquifer between 1974–2010 in Jakarta, Indonesia [177].
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Figure 10. (A) Floods due to the land subsidence phenomena in Jakarta [183], (B) Coastal flooding on April 2009 in Semarang [23].
Figure 10. (A) Floods due to the land subsidence phenomena in Jakarta [183], (B) Coastal flooding on April 2009 in Semarang [23].
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Figure 11. Damages due to the overexploitation of the aquifer in Tehran: (A) uplifting of boreholes (Sabashahr). (Β) damage to the electricity network red arrows showing the deviation from the vertical (Sabashahr). (C) Damaged boreholes suggesting a drop of 30 cm (Eslamshahr and Ahmadabad) [193].
Figure 11. Damages due to the overexploitation of the aquifer in Tehran: (A) uplifting of boreholes (Sabashahr). (Β) damage to the electricity network red arrows showing the deviation from the vertical (Sabashahr). (C) Damaged boreholes suggesting a drop of 30 cm (Eslamshahr and Ahmadabad) [193].
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Figure 12. (A) Wall fence damaged due to vertical displacements of up to 30 cm at Valtonera village. (B) Damaged building wall and (C) greenhouse at Anargiroi village.
Figure 12. (A) Wall fence damaged due to vertical displacements of up to 30 cm at Valtonera village. (B) Damaged building wall and (C) greenhouse at Anargiroi village.
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Figure 13. Geographic distribution of the data (Vertical displacements using Earth Observation techniques (mm/year)).
Figure 13. Geographic distribution of the data (Vertical displacements using Earth Observation techniques (mm/year)).
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Figure 14. Groundwater withdrawal and an area equipped for irrigation with groundwater (data source [232]).
Figure 14. Groundwater withdrawal and an area equipped for irrigation with groundwater (data source [232]).
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Table 1. Characteristic examples of land subsidence due to aquifer overexploitation worldwide since the early 20th century.
Table 1. Characteristic examples of land subsidence due to aquifer overexploitation worldwide since the early 20th century.
AreaCause of OverexploitationMax Vertical Displacements (m)Vertical Displacements Using Earth Observation Techniques (mm/Year)Period of MonitoringData and Methods
Las Vegas, Nevada, USAurbanization>2 [44] 1935–1924
190 [45]1992–1997InSAR
San Joaquin Valley, California, USAagricultural needs9 [52] 1925–1977
Long beach area, California, USAoil extraction8.8 [8]
Santa Clara Valley, California, USAagricultural and industrial needs4 [60] 1910–1995
The city of Houston, Texas, USAagricultural and domestic needs0.3 [63] until 1979
49 [68]2007–2011ALOS
34 [68]2015–2017Sentinel-1A/B satellite
Arizona, USAagricultural needs5.7 [73,74] 1957–1991
Mexico City, Mexicourbanization7.5 [86] 1900–2002
500 [96]1940–1960Geodetic surveys
300–350 [100,101,102,103,104,105]2002–2007InSAR
390 [109]2014–2020Earth Observations techniques and GPS leveling
Celaya, Mexicoagricultural and industrial needs 70–100 [115]2003–2006Envisat and InSAR techniques
90 [84]2007–2011ALOS InSAR timeseries
40–60 [116]2012–2014Envisat and InSAR techniques
Morelia city, Mexicourbanization 70–80 [114,115]2003–2010InSAR
70 [84]2007–2011ALOS InSAR timeseries
90 [122]2014–2021Earth observation techniques
Shanghai, Chinaurban and industrial needs2.9 [134] 1962–2005
26 [145]2018–2020InSAR timeseries
Jiaxin City, Chinaagricultural needs0.84 [146] by 2002
Beijing, Chinaurban and industrial needs1.16 [148] 1935–2009
1.98 [149] 1992–2022InSAR
16–28 [147]1955–1983
15–25 (max:137) [147]1999–2009
Tianjin City, Chinaindustrial needs3.1 [20,126]
26 [127]2011–2012InSAR and GPS leveling
24 [154,155]2010–2014InSAR and GPS leveling
50 [154,155]2015–2019InSAR and GPS leveling
Hebei province, Chinaurban and industrial needs2.68 [153] 1970–2013
Kanto- Tokyo plain, Japanurban and industrial needs 239 [167]1968
Nobi, Plain, JapanIndustrial and agricultural needs0.2 [171] by 1973
Jakarta, Indonesiaurban and industrial needs 10–150 (max: 200–280) [175]1982–2011InSAR and GPS leveling
30–40 [176]2017–2020INSAR (Sentinel-1 SAR data)
Semarang, Indonesiaurbanization 80 [179]2007–2009ALOS–PALSAR satellite SAR interferometry
150 [182]2015–2017SBAS DInSAR analyses using Envisat-ASAR, ALOS-PALSAR, and Sentinel-1A SAR
Bandung, Indonesiaurbanization 80 [175]2000–2011InSAR and GPS leveling
100–120 [187]2015–2017Sentinel-1/2 and ALOS-2 satellite images
Tehran, Iranurban, agricultural, and industrial needs0.88 [192] 2014–2017PS-InSAR
200 [191]2004–2008PS
Venice, Italyindustrial needs 5 [194]1952–1968Geodetic and InSAR
14 [195]1968–1969Geodetic and InSAR
1–2 [198,199,200]1973–1993
Ravenna, Italynatural and man-made factors1.6 [204] 1897–2002GPS leveling
110 [202,203]1972–1973
Murcia, Spaintourism and agricultural needs 5 (max: 35) [207]2008–2009satellite systems (TerraSAR-X)
Kalochori, Greeceindustrial needs4 [1]
Anthemounda valley, Greeceindustrial needs 10–15 [2,4]1995–2001InSAR
East Larisa Plain, Greeceagricultural needs 2.9 [218]1995–2008InSAR/field observations
Thriasio basin, Greeceagricultural needs 3.5–5 [223]2002–2010GPS leveling/field observation
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Tzampoglou, P.; Ilia, I.; Karalis, K.; Tsangaratos, P.; Zhao, X.; Chen, W. Selected Worldwide Cases of Land Subsidence Due to Groundwater Withdrawal. Water 2023, 15, 1094. https://doi.org/10.3390/w15061094

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Tzampoglou P, Ilia I, Karalis K, Tsangaratos P, Zhao X, Chen W. Selected Worldwide Cases of Land Subsidence Due to Groundwater Withdrawal. Water. 2023; 15(6):1094. https://doi.org/10.3390/w15061094

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Tzampoglou, Ploutarchos, Ioanna Ilia, Konstantinos Karalis, Paraskevas Tsangaratos, Xia Zhao, and Wei Chen. 2023. "Selected Worldwide Cases of Land Subsidence Due to Groundwater Withdrawal" Water 15, no. 6: 1094. https://doi.org/10.3390/w15061094

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