Land subsidence has been ongoing in the dry lake beds throughout the Mojave and Morongo groundwater basins since the 1960s. In a study conducted from 2004 - 2009, continuous GPS stations were added to interferometric synthetic aperture radar (InSAR) methods to measure changes in land surface altitude.
Spatially detailed maps of interferometric synthetic aperture radar (InSAR) methods were used to characterize land subsidence associated with groundwater-level declines during various intervals of time between 1992 and 1999 in the Mojave River and Morongo groundwater basins (Sneed and others, 2003). Concerns related to the potential for new or renewed land subsidence in the basins resulted in a cooperative study between the Mojave Water Agency (MWA) and the U.S. Geological Survey (USGS) in 2006. InSAR data were developed to determine the location, extent, and magnitude of vertical land-surface changes in the Mojave River and Morongo ground-water basins for time intervals ranging from about 35 days to 14 months between 1999 and 2000 and between 2003 and 2004. Continued analysis of InSAR data, coupled with geologic and hydrogeologic data, to determine the location, extent, and magnitude of vertical land-surface changes in the Mojave River and Morongo groundwater basins is presented from 2004 to 2009. The results from many future land-subsidence studies, which are scheduled about every 10 years, will be available on the Mojave Water Resources Interactive Map.
For more information, please visit the Mojave Land-Subsidence Studies site.
Below are publications associated with this project.
Land subsidence in the southwestern Mojave Desert, California, 1992–2009
Detection and measurement of land subsidence using interferometric synthetic aperture radar and Global Positioning System, San Bernardino County, Mojave Desert, California
Below are partners associated with this project.
- Overview
Land subsidence has been ongoing in the dry lake beds throughout the Mojave and Morongo groundwater basins since the 1960s. In a study conducted from 2004 - 2009, continuous GPS stations were added to interferometric synthetic aperture radar (InSAR) methods to measure changes in land surface altitude.
Fissure near Lucerne Lake along State Route 247 (visible in background), Mojave Desert, California. The localized subsidence in five areas near dry lake beds was caused by declining water levels in fine-grained (clay and silt) sediments. In the Mojave River and Morongo Groundwater Basins (fig. 2), the combination of variable climatic conditions, tectonic activity, and other factors resulted in complex depositional patterns of clay in the subsurface, which, combined with water-level declines, define the lateral extent and magnitude of subsidence. (Credit: Michelle Sneed, USGS. Public domain.) Spatially detailed maps of interferometric synthetic aperture radar (InSAR) methods were used to characterize land subsidence associated with groundwater-level declines during various intervals of time between 1992 and 1999 in the Mojave River and Morongo groundwater basins (Sneed and others, 2003). Concerns related to the potential for new or renewed land subsidence in the basins resulted in a cooperative study between the Mojave Water Agency (MWA) and the U.S. Geological Survey (USGS) in 2006. InSAR data were developed to determine the location, extent, and magnitude of vertical land-surface changes in the Mojave River and Morongo ground-water basins for time intervals ranging from about 35 days to 14 months between 1999 and 2000 and between 2003 and 2004. Continued analysis of InSAR data, coupled with geologic and hydrogeologic data, to determine the location, extent, and magnitude of vertical land-surface changes in the Mojave River and Morongo groundwater basins is presented from 2004 to 2009. The results from many future land-subsidence studies, which are scheduled about every 10 years, will be available on the Mojave Water Resources Interactive Map.
For more information, please visit the Mojave Land-Subsidence Studies site.
- Publications
Below are publications associated with this project.
Land subsidence in the southwestern Mojave Desert, California, 1992–2009
Groundwater has been the primary source of domestic, agricultural, and municipal water supplies in the southwestern Mojave Desert, California, since the early 1900s. Increased demands on water supplies have caused groundwater-level declines of more than 100 feet (ft) in some areas of this desert between the 1950s and the 1990s (Stamos and others, 2001; Sneed and others, 2003). These water-level deAuthorsJustin T. Brandt, Michelle SneedDetection and measurement of land subsidence using interferometric synthetic aperture radar and Global Positioning System, San Bernardino County, Mojave Desert, California
Land subsidence associated with ground-water-level declines has been recognized as a potential problem in parts of the Mojave Desert, California. Ground water has been the primary source of domestic, agricultural, and municipal water supplies in the desert since the early 1900s. Pumping of ground water from the Mojave River and Morongo ground-water basins in the southwestern Mojave Desert resultedAuthorsMichelle Sneed, Marti E. Ikehara, Sylvia V. Stork, Falk Amelung, Devin L. Galloway - Partners
Below are partners associated with this project.