Abstract
A strong frequency dependence of apparent Q β −1 of shear waves was found for the frequency range from 1 to 25 Hz using band-pass filtered records of about 900 earthquakes occurring in the central Japan area with focal depths from 0 to 150 km. The method used for estimating Q β is a single-station method based on elimination of the source effect from S waves by the use of coda spectra. The validity of the method is confirmed by agreement between the results obtained independently using data from two stations in the same area.
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