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DAMAGE CAUSED BY LAND SUBSIDENCE ... Overdrafting of aquifers is the major cause of subsidence in the southwestern United States, and as ground-water pumping increases, land subsidence also will increase. In many aquifers, ground water is pumped from pore spaces between grains of sand and gravel.
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geochange.er.usgs.gov/sw/changes/anthropogenic/subside/
geochange.er.usgs.gov/sw/changes/anthropogenic/subside/
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USGS - U.S. Geological Survey Ground-Water Information: Land Subsidence ... Land subsidence is a gradual settling or sudden sinking of the Earth's surface owing to subsurface movement of earth materials.
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water.usgs.gov/ogw/subsidence.html
water.usgs.gov/ogw/subsidence.html
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USGS Fact Sheet-165-00 - Land Subsidence in the U.S. (USGS - U.S. Geological Survey Office of Groundwater) ... Land Subsidence in the United States...
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water.usgs.gov/ogw/pubs/fs00165/
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Causes of Land Subsidence ... With the increasing occurrence of land subsidence and resultant earth fissures in certain areas of the state, the consequences of dropping water tables become distinct, physical and sometimes dramatically visible.
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ag.arizona.edu/AZWATER/arroyo/062land.html
ag.arizona.edu/AZWATER/arroyo/062land.html
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Subsidence - Wikipedia, the free encyclopedia
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Subsidence is the motion of a surface (usually, the Earth's surface) as it shifts downward relative to a datum such as sea-level. The opposite of subsidence is uplift, which results in an increase in...
en.wikipedia.org/wiki/Subsidence
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Land subsidence occurs when large amounts of ground water have been excessively withdrawn from an aquifer. The clay layers within the aquifer compact and settle, resulting in lowering the ground surface in the area from which the ground wat...
http://www.sanjacintoriverauthority.com/facts/land-subs...
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Land subsidence (the vertical downward movement of the land surface) has a variety of causes, including some that are related exclusively to human activities (e.g. mining and drainage of organic soils), and some that have entirely natural causes (e.g., isostatic adjustments).
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www.uwsp.edu/geo/faculty/ozsvath/LECTURES/Subsidence.ht...
www.uwsp.edu/geo/faculty/ozsvath/LECTURES/Subsidence.htm
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However since tide gauges are a relative measure of sea level height (see Variations in Sea Level), it is impossible to discern a sea level rise from land subsidence. To resolve this ambiguity, we are installing GPS receivers in the Chesapeake Bay region. ... Land subsidence, in the Chesapeake Bay region, may result from...
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www.ngs.noaa.gov/GRD/GPS/Projects/CB/SUBSIDENCE/subside...
www.ngs.noaa.gov/GRD/GPS/Projects/CB/SUBSIDENCE/subsidence.html
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