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Bulletin of the Seismological Society of America; February 1996; v. 86; no. 1A; p. 144-158
© 1996 Seismological Society of America
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A radial model of anelasticity consistent with long-period surface-wave attenuation

Joseph J. Durek* and Göran Ekström

Department of Earth and Planetary Sciences, 20 Oxford St.Harvard University, Cambridge, Massachusetts 02138

Abstract

A new global model of radial variations in intrinsic shear and compressional attenuation, Qµ(r) and Q{kappa}(r), is presented. The model, called QL6, is derived from recent observations of long-period (150 < T < 300 sec) Rayleigh- and Love-wave attenuation and an extensive set of mode decay observations compiled from the literature. Our preferred model consists of six layers of constant Q, where the parameterization of Qµ(r) follows that of the anelastic component of the preliminary reference earth model (PREM). Relative to the commonly used models of PREM and QM1, lower values of Qµ are required in the upper 200 km of the mantle to explain observations of Love-wave attenuation. The observations require a finite level of compressional attenuation, preferentially located in the upper mantle. An analysis using continuous spline-basis functions supports the layered parameterization—with the recovered model possessing strong gradients in Qµ at the 670-km discontinuity; at the bottom of the asthenosphere; and to a lesser extent, at the base of the lithosphere. However, the continuous model does not have a significant discontinuity in Qµ at the 400-km phase boundary.

Footnotes

* Presently at Seismographic Station, 475 McCone Hall, University of California at Berkeley, Berkeley, California 94720.




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