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Bulletin of the Seismological Society of America; February 1979; v. 69; no. 1; p. 17-25
© 1979 Seismological Society of America
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Causal absorption: Its effect on synthetic seismograms computed by the reflectivity method

M. E. O'NEILL and DAVID P. HILL

OFFICE OF EARTHQUAKE STUDIES U.S. GEOLOGICAL SURVEY, 345 MIDDLEFIELD ROAD, MENLO PARK, CALIFORNIA 94025

Abstract

Lomnitz's causal formulation of anelasticity is incorporated into the Fuchs-Müller-Kennett reflectivity program. For waves passing through a highly attenuating upper-mantle low-velocity zone (Q = 35), the synthetic seismograms computed with Lomnitz's weakly frequency-dependent phase velocity, c, and specific attenuation, Q, differ noticeably from those computed with frequency-independent parameters. For these waves, the first pulse is larger and more abrupt and the peaks and troughs are somewhat later for causal absorption than for noncausal absorption.




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