Depth to Bedrock Based on Modeling of Gravity Data of the Eastern Part of Edwards Air Force Base, California

Open-File Report 2019-1128
Prepared in cooperation with the Air Force Civil Engineer Center
By: , and 

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Abstract

We describe a gravity survey acquired to determine the thickness of basin-fill deposits (depth to bedrock) and to delineate geologic structures that might influence groundwater flow beneath the eastern part of Edwards Air Force Base, California. Inversion of these gravity data combined with geologic map and well information provides an estimate of the thickness of basin-fill deposits (defined here as Cenozoic sedimentary and volcanic rocks). After removing the gravitational effect of the basin-fill deposits, the inversion also results in a gravity map that reflects variations in the bedrock density. The depth to bedrock is generally less than 1 kilometer in the map area, except for localized depressions north and south of Kramer Hills, northwest-trending pockets about 4 kilometers northeast of Rogers Lake, and a large depression southwest of Rogers Lake. In the area near Leuhman Ridge, depth to bedrock is shallow. The Spring and Leuhman faults do not coincide with large variations in basin-fill thickness or with prominent gravity gradients, suggestive of minor vertical displacement and minor horizontal displacement at their southeastern mapped extents where they project across a large gravity low.

Suggested Citation

Langenheim, V.E., Morita, A., Christensen, A.H., Cromwell, G., and Ely, C., 2019, Depth to bedrock based on modeling of gravity data of the eastern part of Edwards Air Force Base, California: U.S. Geological Survey Open-File Report 2019–1128, 12 p., https://doi.org/10.3133/ofr20191128.

ISSN: 2331-1258 (online)

Study Area

Table of Contents

  • Abstract
  • Introduction
  • Datasets
  • Gravity Field
  • Computation Method for Modeling the Thickness of the Basin-fill Deposits
  • Gravity Results
  • Acknowledgments
  • References Cited

Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Depth to bedrock based on modeling of gravity data of the eastern part of Edwards Air Force Base, California
Series title Open-File Report
Series number 2019-1128
DOI 10.3133/ofr20191128
Year Published 2019
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Geology, Minerals, Energy, and Geophysics Science Center
Description Report: iv, 12 p.; Dataset; Metadata
Country United States
State California
Other Geospatial Edwards Air Force Base
Online Only (Y/N) Y
Additional Online Files (Y/N) Y
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