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High-frequency spectra observed at Anza, California: Implications for Q structure

INSTITUTE OF GEOPHYSICS AND PLANETARY PHYSICS (A-025) SCRIPPS INSTITUTE OF OCEANOGRAPHY UNIVERSITY OF CALIFORNIA, SAN DIEGO, LA JOLLA, CALIFORNIA 92093

Abstract

Data from the Anza array in southern California have been analyzed to yield a model for the depth dependence of attenuation. The result is obtained from a formal inversion of the distance dependence of the spectral decay parameter, , observed from sources at a wide range of distances from single stations.

The inversion procedure assumes constant Q_i in plane layers and finds models which are as nearly constant with depth as possible. We find that the data cannot be explained by a model in which Q_i is constant with depth and that the data generally require three-layer models. The resulting models typically give Q_i for P waves between 300 and 1000 in the top 5 km, rising to 1000 to 3000 at greater depths, and decreasing to 700 to 1000 around 12 km depth. Q_i for S waves is slightly higher in most cases. Because this depth dependence of Q_i is generally correlated with the depths of earthquake epicenters, we suggest that Q_i may be due to a pressure and temperature-controlled intrinsic attenuation mechanism.

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