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Characteristics of Body-Wave Attenuations in the Bhuj Crust

National Geophysical Research Institute, Council of Scientific and Industrial Research, Uppal Road, Hyderabad-500007, India padhys{at}rediffmail.com

The frequency-dependent attenuations of P and S waves in the crust beneath Bhuj are estimated using the extended coda-normalization method for varying the exponent, , in the geometrical spreading function, r (r is the hypocentral distance). The analysis is based on the measurement of 378 aftershocks of the 2001 Bhuj earthquake (M_w 7.6). The events were recorded by six stations of the network in the frequency range of 1–24 Hz. The values of and , corresponding to spectral amplitude decays, show strong frequency dependence and are expressed as (0.052±0.019)f^-(1.1±0.06) and (0.02±0.01)f^-(1.0±0.04), respectively, when is fixed at unity. The ratio is found to be larger than unity for the whole frequency range. A model of random heterogeneity characterized by an exponential autocorrelation function with a root mean square fractional fluctuation of 6%–8%, a correlation length a of 0.4–1.2 km, and ²/a10^-2–10^-3 km for the frequency range from 1 to 24 Hz can simulate the observed attenuation properties. This suggests that a scattering model well reproduce the frequency-dependent characteristics of and obtained in Bhuj.