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AKi 1980
AKi, K. (1980). Scattering and attenuation of shear waves in the lithosphere. Journal of Geophysical Research 85: doi: 10.1029/JB080i011p06496. issn: 0148-0227.

Recent measurements of Qβ-1 of S waves in the lithosphere for frequency range from 0.02 to 25 Hz show a remarkable frequency dependence and systematic variation from place to place depending on the current tectonic activity. In order to test the hypothesis that the attenuation of S waves may be caused by the loss of energy by scattering due to heterogeneity, the amplitudes of S and coda waves were measured simultaneously for 900 local earthquakes in the central Japan for various frequency bands. The data were interpreted using the S to S single-scattering theory for coda waves, which is now supported by the observed agreement between Q of coda and Qβ, and also by the observed identical local site effect on coda and S waves. The result shows that the loss of energy from S waves required to explain coda amplitudes agrees with the attenuation of S waves within the uncertainty of measurements. This conclusion is supported by several recent studies on Q of coda, Q of Lg, Aβ, and coda excitation by other workers.

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Journal
Journal of Geophysical Research
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American Geophysical Union
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