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Far-field waveforms from an arbitrarily expanding, transparent spherical cavity in a prestressed medium

Minster, J. B. and Suteau, A. M. (1977) Far-field waveforms from an arbitrarily expanding, transparent spherical cavity in a prestressed medium. Geophysical Journal of the Royal Astronomical Society, 50 (1). pp. 215-233. ISSN 0016-8009. http://resolver.caltech.edu/CaltechAUTHORS:20141111-165343330

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Abstract

Stress relaxation due to a growing cavity in a uniformly prestressed (pure shear) elastic medium is investigated, using the transparent source approximation of Archambeau (1972). A simple representation of the far-field radiation is obtained. A planar, circular dislocation of same growth history as the cavity is constructed which yields the same far-field pulses, except for geometrical effects. It is shown that different ‘equivalent’ dislocations must be used to model P and S pulses wherever the rupture velocity is trans-sonic. Simple analytical forms for the far-field pulses are derived which hold even in the case of relatively complicated source growth history. The dependence of waveforms on the various source parameters is illustrated by selected waveform calculations. It is suggested that this model yields an adequate representation of the far-field tectonic release radiation from underground explosions.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1111/j.1365-246X.1977.tb01330.xDOIArticle
http://gji.oxfordjournals.org/content/50/1/215.abstractPublisherArticle
Additional Information:Copyright © 2014 The Royal Astronomical Society. Received 1976 November 3; in original form 1976 August 23. Part of this research was completed as both authors were at the Institut de Physique du Globe de Paris, and was supported by Institut National d'ktronomie et de Geophysique. We are grateful to Dr C. B. Archambeau and an anonymous reviewer for useful criticisms and suggestions. Calculations were performed at the Seismological Laboratory of the California Institute of Technology. This research was partly supported by the Advanced Research Projects Agency of the Department of Defense and was monitored by the Air Force Office of Scientific Research under Contract No. F44620-72-C4078.
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Funding AgencyGrant Number
Advanced Research Projects Agency (ARPA)UNSPECIFIED
Air Force Office of Scientific Research (AFOSR)F44620-72-C4078
Record Number:CaltechAUTHORS:20141111-165343330
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20141111-165343330
Official Citation:J. B. Minster and A. M. Suteau Far-field waveforms from an arbitrarily expanding, transparent spherical cavity in a prestressed medium Geophys. J. Int. (1977) 50 (1): 215-233 doi:10.1111/j.1365-246X.1977.tb01330.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51622
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:12 Nov 2014 15:59
Last Modified:13 Feb 2019 18:06

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