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Principal facts and an approach to collecting gravity data using near-real-time observations in the vicinity of Barstow, California

Open-File Report 2013-1264

By:
, ,
DOI: 10.3133/ofr20131264

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Abstract

A gravity survey was done in the vicinity of Barstow, California, in which data were processed and analyzed in the field. The purpose of the data collection was to investigate possible changes in gravity across mapped Quaternary faults and to improve regional gravity coverage, adding to the existing national gravity database. Data were collected, processed, analyzed, and interpreted in the field in order to make decisions about where to collect data for the remainder of the survey. Geological targets in the Barstow area included the Cady Fault, the Manix Fault, and the Yermo Hills. Upon interpreting initial results, additional data were collected to more completely define the fault targets, rather than collecting data to improve the regional gravity coverage in an adjacent area. Both the Manix and Cady Faults showed gravitational expression of the subsurface in the form of steep gravitational gradients that we interpret to represent down-dropped blocks. The gravitational expression of the Cady Fault is on trend with the linear projection of the mapped fault, and the gravitational expression of the Manix Fault is north of the current northernmost mapped strand of the fault. The relative gravitational low over the Yermo Hills was confirmed and better constrained, indicating a significant thickness of sediments at the junction of the Calico, Manix, and Tin Can Alley Faults.

Geospatial Extents

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Principal facts and an approach to collecting gravity data using near-real-time observations in the vicinity of Barstow, California
Series title:
Open-File Report
Series number:
2013-1264
DOI:
10.3133/ofr20131264
Year Published:
2013
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Reston, VA
Contributing office(s):
Geology, Minerals, Energy and Geophysics Science Center
Description:
iii, 24 p.
Number of Pages:
27
Country:
United States
State:
California
City:
Barstow
Other Geospatial:
Cady Fault;Calico Fault;Manix Fault;Tin Can Alley Fault;Yermo Hills