Determination of land subsidence related to ground-water-level declines using Global Positioning System and leveling surveys in Antelope Valley, Los Angeles and Kern Counties, California, 1992
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Potentiometric surface of principal aquifer of the Lancaster groundwater subbasin
Historical PreciseLeveling Surveys
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14 in Lancaster 218 bench marks 90th Street East Angeles County Antelope Valley aquifer aquifer system aquifer-system compaction Avenue G bench marks BM California concrete post projecting control stations coordinates datum deep aquifer dirt rd drive EAFB eB Avenue ellipsoidal ellipsoidal height error estimated subsidence fine-grained ft above ls ft/yr Geodetic Survey geoid GEOID90 Global Positioning System GPS survey ground-water levels Highway 138 HPGN hydraulic head hydrograph intersection Julian day Lakebed land subsidence land-surface elevations Last recovered locations Magni marks in Antelope measured multiple-constraint adjustment orthometric heights Palmdale PEARBLOSSOM Period of record primary vertical-control stations Rate tude Rate rates of subsidence Rogers Lake Rosamond Blvd San Andreas Fault Sierra Highway Sierra Hwy square concrete post Street East Avenue tectonic tectonic uplift Township 9 North/Range tude Rate tude U.S. Geological Survey USC&GS monument USGS vector length vertical water-level declines Water-level elevation West Avenue