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The effect of attenuation on gross earth models

Hart, R. S. and Anderson, D. L. and Kanamori, H. (1977) The effect of attenuation on gross earth models. Journal of Geophysical Research, 82 (11). pp. 1647-1654. ISSN 0148-0227. doi:10.1029/JB082i011p01647.

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In most recent free oscillation studies of the earth's interior the effect of absorption upon the eigenperiods of the earth has been ignored. This is equivalent to assuming that the earth is close to perfectly elastic. Since the actual earth is significantly anelastic over seismic frequencies, a frequency-dependent correction of the order of 1% must be applied to the normal mode periods in order that models based on those modes may be compared with body wave results. The eigenperiods of an earth model based on uncorrected data, model C2 (Anderson and Hart, 1976a), are adjusted for attenuation and then inverted to determine the resulting overall perturbation in the earth model. The corrected normal mode data as well as the uncorrected data can be fitted by a spherically symmetric earth model. The effect of including the attenuation term is to generally increase seismic velocities, particularly shear velocities, throughout the model. An important consequence of this change is to reduce or eliminate base line discrepancies between body wave results and normal mode results.

Item Type:Article
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Kanamori, H.0000-0001-8219-9428
Additional Information:Copyright 1977 by the American Geophysical Union. (Received July 23, 1976; revised November 22, 1976; accepted December 12, 1976.) Paper number 6B0923. 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 thank Tom Jordan and Richard Sailor for calling our attention to two recent Soviet papers on the subject of this paper. Contribution 2788 of the Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California.
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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 Sciences2788
Issue or Number:11
Record Number:CaltechAUTHORS:20141106-143256840
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Official Citation:Hart, R. S., D. L. Anderson, and H. Kanamori (1977), The effect of attenuation on gross earth models, J. Geophys. Res., 82(11), 1647–1654, doi:10.1029/JB082i011p01647.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51390
Deposited By: George Porter
Deposited On:06 Nov 2014 22:45
Last Modified:10 Nov 2021 19:10

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