Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published July 1977 | Published
Journal Article Open

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

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.

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.

Attached Files

Published - Geophys._J._Int.-1977-Minster-215-33.pdf

Files

Geophys._J._Int.-1977-Minster-215-33.pdf
Files (998.7 kB)
Name Size Download all
md5:665bade06df8074f63951d3494bf7dcb
998.7 kB Preview Download

Additional details

Created:
August 19, 2023
Modified:
October 18, 2023