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An attempt has been made to invert a large set of attenuation data for Love waves and toroidal oscillations in the Earth, using a recent method by Backus and Gilbert. The difficulty in finding an acceptable model of internal friction which explains the data, under the assumption that the internal friction is independent of frequency, casts doubt on the validity of this assumption. A frequency-dependent model of internal friction is presented which is in good agreement with the seismic data and with recent experimental measurements of attenuation in rocks.
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David D. Jackson (1971) studied this question.
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