USGS - science for a changing world

GMEG - Geophysics Unit of Menlo Park, CA- (GUMP)


Geophysics Unit of Menlo Park, CA (GUMP)

U.S. Geological Survey - Western Region - Geology and Geophysics

Watt Main



Geophysics in Joshua Tree National Park

USGS Navajo Nation Studies banner

above: Picture of Pleasant Valley, looking north with Malapai Hill in the backgroud


Craig McCabe Helicopter

above left: Craig McCabe with gravity meter backpack. above right: Helicopter gravity in Pinto Basin


We use isostatic gravity data as a basis for modeling the shape of basins beneath Joshua Tree National Park to determine the location and geometry of faults within the area. See the following USGS publication for more details:


Collecting ground magnetic data
We collect ground magnetic data to locate and characterize faults in an area where highly magnetic basaltic rocks are in contact with less magnetic granitic rocks and basin sediments.



left: Nichole Knepprath collecting ground magnetic data in the eastern Pinto Basin

AMT (coming soon...)


Geology of Joshua Tree National Park and Vicinity
3D Photographic Tour of Park Geology

Geology and Geophysics || GUMP || USGS Geophysics Hub


Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: G & G Webmasters
Page Last Modified: 13-Dec-2016@16:37