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Book Chapter

Seismic Waves from a Horizontal Force*

By
J. E. White
J. E. White
Research Department, Ohio Oil Company, Denver, Colorado; formerly with Field Research Laboratories, Magnolia Petroleum Company, Dallas, Texas.
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S. N. Heaps
S. N. Heaps
Field Research Laboratories, Magnolia Petroleum Company, Dallas, Texas.
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P. L. Lawrence
P. L. Lawrence
Field Research Laboratories, Magnolia Petroleum Company, Dallas, Texas.
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Published:
January 01, 2000

Abstract

As part of a program of fundamental research on seismic waves, a generator was built for applying a transient horizontal force at the surface of the ground and the resulting seismic waves were observed in some detail. The force is applied when a mass swinging through an arc strikes a target anchored to the earth. Surface geophones along a line in the direction of the force register vertically polarized shear waves refracted back up to the surface, whereas geophones on a line perpendicular to the force register horizontally polarized shear waves. The speeds of the two types of shear waves are often different, indicating anisotropy. Geophones buried below the target show a down-going shear wave. Variation of amplitude with angle, and other features, are in qualitative agreement with the results given by Rayleigh and others for the waves due to a force at a point in an infinite solid. Love waves and other surface waves were observed, which of course would not be expected from an nterior force.

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Contents

Society of Exploration Geophysicists Geophysics Reprint Series

Seismic Wave Propagation: Collected Works of J. E. White

J. E. White
J. E. White
Professor Emeritus, Colorado School of Mines
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Society of Exploration Geophysicists
Volume
21
ISBN electronic:
9781560802471
Publication date:
January 01, 2000

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