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Shear velocity and density of an attenuating earth

Hart, Robert S. and Anderson, Don L. and Kanamori, Hiroo (1976) Shear velocity and density of an attenuating earth. Earth and Planetary Science Letters, 32 (1). pp. 25-34. ISSN 0012-821X. doi:10.1016/0012-821X(76)90180-1.

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The dispersion that must accompany absorption is taken into account in many recent body-wave investigations but has been largely ignored in surface-wave and free-oscillation studies. In order to compare body-wave and free-oscillation data a correction must be made to travel times or periods to account for absorption-related physical dispersion. The correction depends on the frequency and Q of the data and can be as high as 1% which is much larger than the uncertainty of the raw data. Corrected toroidal mode data is inverted to obtain shear velocity and density versus depth. The average shear velocity in the upper 600 km is ∼2% greater than obtained from the uncorrected data. The resulting shear-wave travel times oscillate about the Jeffreys-Bullen values with an average baseline of only +0.5 second. Thus, the discrepancy between body-wave and free-oscillation studies is eliminated.

Item Type:Article
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URLURL TypeDescription
Kanamori, Hiroo0000-0001-8219-9428
Additional Information:© 1976 Elsevier Scientific Publishing Company. Received April 14, 1976; Revised version received June 14, 1976. This research was supported by the Advanced Research Projects Agency of the Department of Defense and was monitored by the Air Force Office of Scientific Research under Contract F44620-72-C-0078. We would like to acknowledge helpful discussions with H.P. Liu and to credit M. Randall with reopening interest in this problem which has lain fallow in spite of the obvious implications of the work of Jeffreys, Futterman, Lomnitz, Strick, Davies and Carpenter.
Funding AgencyGrant Number
Advanced Research Projects Agency (ARPA)UNSPECIFIED
Air Force Office of Scientific Research (AFOSR)F44620-72-C-0078
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Caltech Division of Geological and Planetary Sciences2743
Issue or Number:1
Record Number:CaltechAUTHORS:20150211-144235072
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Official Citation:Robert S. Hart, Don L. Anderson, Hiroo Kanamori, Shear velocity and density of an attenuating earth, Earth and Planetary Science Letters, Volume 32, Issue 1, September 1976, Pages 25-34, ISSN 0012-821X, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54741
Deposited By: Tony Diaz
Deposited On:11 Feb 2015 22:53
Last Modified:10 Nov 2021 20:37

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