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Bulletin of the Seismological Society of America; August 1973; v. 63; no. 4; p. 1375-1391
© 1973 Seismological Society of America
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A numerical study of tectonic stress release by underground explosions

D. J. ANDREWS

DEPARTMENT OF EARTH AND PLANETARY SCIENCES MASSACHUSETTS INSTITUTE OF TECHNOLOGY, CAMBRIDGE, MASSACHUSETTS 02139

Abstract

Fault dislocation driven by the hoop stress associated with the P wave from an underground explosion is proposed as a mechanism for tectonic stress release. The mechanism is examined in two-dimensional numerical simulations. Determined initial value problems can be posed, from which plots of near-field motion are obtained. If tectonic stress is near the limit allowed by friction, then sliding can explain observed SH amplitudes. The source-time functions of both the explosion and the dislocation are equivalent to step functions at long periods. The corner period for the dislocation is less than 1 sec for low-yield explosions with relative double-couple strengths less than 1.0.




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