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Attenuation models of the earth

Anderson, Don L. and Hart, R. S. (1978) Attenuation models of the earth. Physics of the Earth and Planetary Interiors, 16 (4). pp. 289-306. ISSN 0031-9201. https://resolver.caltech.edu/CaltechAUTHORS:20150218-093908079

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Abstract

Free oscillation and body wave data are used to construct average Q models for the earth. The data set includes fundamental and overtone observations of the radial, spheroidal and toroidal modes, ScS observations and amplitudes of body waves as a function of distance. The preferred model includes a low-Q zone at both the top and the bottom of the mantle. In these regions the seismic velocities are likely to be frequency dependent in the “seismic” band. Absorption in the mantle is predominantly due to losses in shear. Compressional absorption may be important in the inner core. A grain-boundary relaxation model is proposed that explains the dominance of shear over compressional dissipation, the roughly frequency independent average values for Q and the variation of Q with depth. In the high-Q regions, the lithosphere and the midmantle (200–2000 km), Q is predicted to be frequency dependent. However, the low-Q regions of the earth, where Q is roughly frequency independent, dominate the observations of attenuation.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/0031-9201(78)90068-7DOIArticle
http://www.sciencedirect.com/science/article/pii/0031920178900687PublisherArticle
Additional Information:© 1978 Published by Elsevier B.V. Received 31 May 1977, Revised 20 June 1977, Accepted 20 June 1977, Available online 26 October 2002. We thank Hiroo Kanamori, L. Burdick, A. Dziewonski, T. Ahrens and R. Sailor for their helpful discussions and comments. E. Okal, B. Bolt, D. Brillinger, R. Geller and S. Stein kindly made available data prior to publication. Freeman Gilbert and Ray Buland provided us with an extensive eigenfunction data tape. 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 No. F49620-77-C-0022. Contribution Number 2916, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125.
Funders:
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)F49620-77-C-0022
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences2916
Issue or Number:4
Record Number:CaltechAUTHORS:20150218-093908079
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150218-093908079
Official Citation:Don L. Anderson, R.S. Hart, Attenuation models of the earth, Physics of the Earth and Planetary Interiors, Volume 16, Issue 4, May 1978, Pages 289-306, ISSN 0031-9201, http://dx.doi.org/10.1016/0031-9201(78)90068-7. (http://www.sciencedirect.com/science/article/pii/0031920178900687)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54934
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:18 Feb 2015 18:07
Last Modified:03 Oct 2019 08:01

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