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Data Series 804

Magnetic Susceptibility Data for Some Exposed Bedrock in the Western Conterminous United States

By Mark E. Gettings and Mark W. Bultman


In-place rock magnetic susceptibility measurements for 746 sites in the western conterminous United States are reported in a database. Of these 746 sites, 408 sites are in the Silverton Caldera area of the San Juan Mountains of southwestern Colorado. Of the 408 sites in the Silverton Caldera area, 106 sites are underground. The remaining 338 sites outside the Silverton Caldera area were on outcropping rock, are distributed from southern Arizona to northwestern Wyoming, and include data from California, Nevada, Utah, Colorado, and New Mexico. Rock-density measurements are included for some sites. These data have been collected by various U.S. Geological Survey studies from 1991 through 2012 and are intended to help improve geophysical modeling of the Earth’s crust in the Western United States. A map-based graphical user interface is included to facilitate use of the data.

First posted February 19, 2014

For additional information, contact:
Contact Information, Geology, Minerals, Energy, & Geophysics Science Center—Tucson
USGS, c/o University of Arizona
ENRB Bldg, 520 N. Park Ave, Rm 355
Tucson, AZ 85719-5035

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Suggested citation:

Gettings, M.E., and Bultman, M.W., 2014, Magnetic susceptibility data for some exposed bedrock in the western conterminous United States: U.S. Geological Survey Data Series 804, 5 p., with graphical user interface,

ISSN 2327-638X (online)



Introduction and Background

Data Acquisition

Database Access with Graphical User Interface

References Cited


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