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Open-File Report 2012–1191

Prepared in Cooperation with the U.S. Army Corps of Engineers

Measurement of Near-Surface Seismic Compressional Wave Velocities Using Refraction Tomography at a Proposed Construction Site on the Presidio of Monterey, California

By Michael H. Powers and Bethany L. Burton

Thumbnail of and link to report PDF (3.1 MB)Abstract

The U.S. Army Corps of Engineers is determining the feasibility of constructing a new barracks building on the U.S. Army Presidio of Monterey in Monterey, California. Due to the presence of an endangered orchid in the proposed area, invasive techniques such as exploratory drill holes are prohibited. To aid in determining the feasibility, budget, and design of this building, a compressional-wave seismic refraction survey was proposed by the U.S. Geological Survey as an alternative means of investigating the depth to competent bedrock. Two sub-parallel profiles were acquired along an existing foot path and a fence line to minimize impacts on the endangered flora. The compressional-wave seismic refraction tomography data for both profiles indicate that no competent rock classified as non-rippable or marginally rippable exists within the top 30 feet beneath the ground surface.

First posted October 2, 2012

For additional information contact:
Director, Crustal Geophysics and Geochemistry Science Center
U.S. Geological Survey
Box 25046, Mail Stop 964
Denver, CO 80225
http://crustal.usgs.gov/

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Suggested citation:

Powers, M.H., and Burton, B.L., 2012, Measurement of near-surface seismic compressional wave velocities using refraction tomography at a proposed construction site on the Presidio of Monterey, California: U.S. Geological Survey Open-File Report 2012–1191, 17 p.



Contents

Abstract

Introduction

Geological Background

Seismic Refraction Method

Seismic Refraction Survey

Conclusions

Acknowledgments

References Cited

Appendix 1: Seismic Refraction Traveltime Curves


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