MINING RELATED SUBSIDENCE IN CRESCENT VALLEY, NEVADA, FROM RADAR INTERFEROMETRY: IMPLICATIONS FOR GEODYNAMIC INTERPRETATION OF PERMANENT GLOBAL POSITIONNING SYSTEM VELOCITIES

Interferometry Synthetic Aperture Radar (InSAR) reveals high rate and frequency of ground motion link to mining and agricultural related water extraction in Nevada, USA. The deformation rates within the basins reach several tens of centimeters in the 1992-2001 period. A two dimensional inversion from SAR data reveals centimeter scale horizontal deformation on the edge of a subsidence system. Subsidence and vertical deformation also affects bedrock on which GPS permanent stations are setup for regional tectonic experiment. InSAR reveals that the Basin and Range geodetic network (BARGEN) permanent GPS station LEWI‘s velocity is likely to represent in part the ground motion related to mining activities in the nearby Crescent Valley area thus introducing bias to geodynamic interpretation from LEWI's velocity.