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Bulletin of the Seismological Society of America; February 1980; v. 70; no. 1; p. 101-125
© 1980 Seismological Society of America
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Short-period S-wave attenuation under the United States

ZOLTAN DER, EUGENE SMART and AUDREY CHAPLIN

ALEXANDRIA LABORATORIES TELEDYNE GEOTECH, ALEXANDRIA, VIRGINIA 22314

Abstract

A study of short-period S-wave spectra from deep events recorded at LRSM stations indicates severe attenuation of S waves under the Western United States. The average differential in ts* between the Eastern and Western United States was found to be ~0.67 ± 0.19 sec (95 per cent confidence interval), which is several times greater than {Delta} tp* ~ 0.2 - 0.25 for short-period P. This indicates that most, if not all, energy loss occurs in shear deformation. The numerical value of the ts* differential is also smaller than that derived from long-period spectra indicating a frequency dependence of Q.




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