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Attenuation of shear waves in the upper and lower mantle

Kovach, Robert L. and Anderson, Don L. (1964) Attenuation of shear waves in the upper and lower mantle. Bulletin of the Seismological Society of America, 54 (6). pp. 1855-1864. ISSN 0037-1106.

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The attenuation of seismic waves is a direct measure of the absorption due to nonelastic processes in the earth. The well known difficulties in obtaining body wave amplitude decrement data have been avoided by studying the spectral ratios of multiple ScS and sScS phases from two deep focus earthquakes recorded at near normal incidence. The average Q, for shear, in the mantle is about 600 for the frequency range 0.015 to 0.07 cps. Assuming that equal radiation occurs upwards and downwards from the source the average Q for the upper 600 km of the mantle is determined to be about 200 and about 2200 for the rest of the mantle. The value for Q at the base of the mantle is at least 5000 for shear waves.

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Additional Information:© 1965 Seismological Society of America. Manuscript received June 29, 1964. This research was supported by Contract AF-49(638)-1337 of the Air Force Office of Scientific Research as part of the Advanced Research Projects Agency project VELA. The authors profited from conversations with Charles B. Archambeau, S. W. Smith and Frank Press. Computer programs written by Bruce Julian were used in this study.
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Air Force Office of Scientific Research (AFOSR)AF-49(638)-1337
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Caltech Division of Geological Sciences1274
Issue or Number:6
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Official Citation: Robert L. Kovach and Don L. Anderson Attenuation of shear waves in the upper and lower mantle Bulletin of the Seismological Society of America December 1964 54:1855-1864
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45332
Deposited By: Ruth Sustaita
Deposited On:30 Apr 2014 15:01
Last Modified:03 Oct 2019 06:29

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