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Observed asymmetry of amplitudes from a high explosive source

FLUID AND SOLID MECHANICS LABORATORY INSTITUTE OF SCIENCE AND TECHNOLOGY THE UNIVERSITY OF MICHIGAN, ANN ARBOR, MICHIGAN

Abstract

Frequency analysis of seismic magnetic tape records from a 500-ton high-explosive source shows a pronounced variation of amplitude with frequency for two different azimuths from the source. This amplitude variation is attributed, at least in part, to diffraction effects produced by the geologic structure in the vicinity of the source. The possibility of generating both SV and SH waves from P waves within this structure seems very probable.

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				D. E. WILLIS Comparison of seismic waves generated by different types of source Bulletin of the Seismological Society of America, October 1, 1963; 53(5): 965 - 978. [Abstract] [PDF]

				W. C. MEECHAM and J. DENOYER Azimuthal asymmetry of a point source in a cylindrical low velocity medium Bulletin of the Seismological Society of America, January 1, 1962; 52(1): 139 - 144. [Abstract] [PDF]