Two‐dimensional inversion of audiomagnetotelluric (AMT) sounding data define buried resistivity distributions that reflect subsurface geology and structure within the upper kilometer beneath Pleasant Valley, a 1–2 km‐deep pull‐apart basin in Joshua Tree National Park, southern California. The Park lies within the Eastern California Shear Zone just east of the San Andreas Fault, and is surrounded by developing desert communities. Understanding the subsurface in and around the Park is important for management of groundwater resources, for mitigation of seismic hazards, and for unraveling the tectonic evolution of the region. Our resistivity models, interpreted in conjunction with gravity inversions, show transitions between coarse‐grained and fine‐grained alluvium, resistive (> 400 ohm‐m) crystalline rocks, and the locations of range‐front and intra‐basin faults.
|Title||An integrated geophysical approach for groundwater and seismic hazard management in Joshua Tree National Park, southern California|
|Authors||Darcy McPhee, Victoria E. Langenheim, Bruce A. Chuchel, Louise Pellerin|
|Publication Type||Conference Paper|
|Publication Subtype||Conference Paper|
|Record Source||USGS Publications Warehouse|
|USGS Organization||Geology, Minerals, Energy, and Geophysics Science Center; National Cooperative Geologic Mapping and Landslide Hazards|