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First motions from seismic sources in a semi-infinite homo-geneous medium overlain by an inhomogeneous layer

DEPARTMENT OF APPLIED MATHEMATICS AND THEORETICAL PHYSICS UNIVERSITY OF CAMBRIDGE, SILVER STREET, CAMBRIDGE England

Abstract

The problem of seismic radiation from buried sources situated at a depth H below the free surface of an inhomogeneous layer of thickness h(< H) overlying a semi-infinite homogeneous medium is considered. First-motion solutions have been obtained at the free surface. Three point sources—slip on a horizontal plane, strike slip on a vertical plane and dip slip on a plane dipping at 45°—are considered in detail. Numerical results are computed for a linear increase of P and S velocities in the layer. Amplitude variations and first-motion signs of P, SV and SH waves are shown graphically for homogeneous and inhomogeneous media.

Footnotes

Present address: KSEPL, Volmerlaan 6, Rijswijk (ZH) The Netherlands.