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Characteristics of body-wave attenuations in the Bhuj crust

Simanchal Padhy
Characteristics of body-wave attenuations in the Bhuj crust
Bulletin of the Seismological Society of America (December 2009) 99 (6): 3300-3313


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, gamma , in the geometrical spreading function, r (super gamma ) (r is the hypocentral distance). The analysis is based on the measurement of 378 aftershocks of the 2001 Bhuj earthquake (M (sub w) 7.6). The events were recorded by six stations of the network in the frequency range of 1-24 Hz. The values of Q (super -1) (sub P) and Q (super -1) (sub S) , corresponding to spectral amplitude decays, show strong frequency dependence and are expressed as (0.052+ or -0.019)f (super -(1.1+ or -0.06)) and (0.02+ or -0.01)f (super -(1.0+ or -0.04)) , respectively, when gamma is fixed at unity. The ratio Q (super -1) (sub P) /Q (super -1) (sub S) 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 epsilon of 6%-8%, a correlation length a of 0.4-1.2 km, and epsilon (super 2) /a nearly equal 10 (super -2) -10 (super -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 Q (super -1) (sub P) and Q (super -1) (sub S) obtained in Bhuj.

ISSN: 0037-1106
EISSN: 1943-3573
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 99
Serial Issue: 6
Title: Characteristics of body-wave attenuations in the Bhuj crust
Author(s): Padhy, Simanchal
Affiliation: National Geophysical Research Institute, Council of Scientific and Industrial Research, Hyderabad, India
Pages: 3300-3313
Published: 200912
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 63
Accession Number: 2010-012556
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables, sketch map
N23°11'60" - N23°11'60", E69°54'00" - E69°54'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201008
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