Published December 1964
| Published
Journal Article
Open
Attenuation of shear waves in the upper and lower mantle
- Creators
- Kovach, Robert L.
- Anderson, Don L.
Abstract
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.
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.Attached Files
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Additional details
- Eprint ID
- 45332
- Resolver ID
- CaltechAUTHORS:20140430-073408090
- AF-49(638)-1337
- Air Force Office of Scientific Research (AFOSR)
- Created
-
2014-04-30Created from EPrint's datestamp field
- Updated
-
2023-07-02Created from EPrint's last_modified field
- Other Numbering System Name
- Caltech Division of Geological Sciences
- Other Numbering System Identifier
- 1274