U.S. launches satellite survey to measure extent of San Joaquin Valley sinking
Scientists suspect that parts of the San Joaquin Valley have started to sink again after years of stability, a troubling development that geologists say can be traced to increased pumping of groundwater. To measure the extent of the problem, the U.S. Geological Survey is launching a three-year study that will use sophisticated satellite tracking to map sagging land in the valley's arid floor in western Fresno and Kings counties. Read more