InSAR Deformation Map (IMAGE) Arizona State University Caption InSAR deformation map indicating the rate of downward movement (sinking) of the Earth's surface, during the study period from 2007-2010. The map highlights the occurrence of the fastest land subsidence in the southern portions of California's Central Valley. Credit ASU Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.