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Bulletin of the Seismological Society of America; February 1971; v. 61; no. 1; p. 79-92
© 1971 Seismological Society of America
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The elastic residual field of a very long strike-slip fault in the presence of a discontinuity

KACPER RYBICKI*

LAMONT-DOHERTY GEOLOGICAL OBSERVATORY COLUMBIA UNIVERSITY, PALISADES, NEW YORK 10964

Abstract

On the basis of dislocation theory, formulas for the elastic residual field of a long strike-slip fault in a half-space with a vertical and horizontal discontinuity are given. The obtained results are applied to the 1966 Parkfield-Cholame earthquake. There is good agreement between the calculated residual stress field and the distribution of aftershocks.

The influence of an underlying layer on the residual-surface displacements and strains of a long, vertical strike-slip fault located in the surface layer was found. Both displacements and strains diminish faster as a function of distance from a fault in the presence of a more rigid underlying layer. The computed results show that the dislocation model of a fault in a homogeneous half-space can be inadequate in many cases.

Footnotes

* On leave from Institute of Geophysics of the Polish Academy of Science during the academic year 1969-70.




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