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Bulletin of the Seismological Society of America; February 1984; v. 74; no. 1; p. 61-78
© 1984 Seismological Society of America
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S*

P. R. GUTOWSKI, F. HRON, D. E. WAGNER and S. TREITEL

AMOCO PRODUCTION RESEARCH, P.O. BOX 591, TULSA, OKLAHOMA 74102
INSTITUTE OF EARTH AND PLANETARY PHYSICS DEPARTMENT OF PHYSICS UNIVERSITY OF ALBERTA, EDMONTON, ALBERTA, Canada, T6G 2J1

Abstract

The interesting and common situation of shallow point sources close to the free surface can be modeled using an explicit elastic finite difference procedure. If the source depth is less than the predominant wavelength from the surface or other well-defined elastic boundary, then shear waves S*, are generated with an amplitude which depends strongly on the source depth. As the source depth is decreased, the amplitude of the resulting shear wave increases exponentially and the particle motion is confined to a plane perpendicular to the direction of propagation. These shear waves radiate from a point on the boundary directly above the source with a radiation pattern that is zero at grazing incidence, rises to a positive maximum at about 55° from the vertical, changes polarity, and increases negatively until merging with the PS wave. Since the use of shallow explosive sources for seismic exploration is favorable for the generation of S*, we present a field data case as an illustration.




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