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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/5842
Title: Body Wave Crustal Attenuation Characteristics in the Garhwal Himalaya, India
Authors: Negi S.S.
Paul A.
Joshi A.
Kamal,
Published in: Pure and Applied Geophysics
Abstract: We estimate frequency-dependent attenuation of P and S waves in Garhwal Himalaya using the extended coda normalization method for the central frequencies 1.5, 2, 3, 4, 6, 8, 10, 12, and 16 Hz, with earthquake hypocentral distance ranging from 27 to 200 km. Forty well-located local earthquake waveforms were used to study the seismic attenuation characteristics of the Garhwal Himalaya, India, as recorded by eight stations operated by Wadia Institute of Himalayan Geology, Dehradun, India, from 2007 to 2012. We find frequency-dependent P and S wave quality factors as defined by the relations Q<inf>P</inf> = 56 ± 8f0.91±0.002 and Q<inf>S</inf> = 151 ± 8f0.84±0.002 by fitting a power-law frequency dependence model for the estimated values over the whole region. Both the Q<inf>P</inf> and Q<inf>S</inf> values indicate strong attenuation in the crust of Garhwal Himalaya. The ratio of Q<inf>S</inf>/Q<inf>P</inf> > 1 obtained for the entire analyzed frequency range suggests that the scattering loss is due to a random and high degree of heterogeneities in the earth medium, playing an important role in seismic wave attenuation in the Himalayan crust. © 2014, Springer Basel.
Citation: Pure and Applied Geophysics (2015), 172(6): 1451-1469
URI: https://doi.org/10.1007/s00024-014-0966-9
http://repository.iitr.ac.in/handle/123456789/5842
Issue Date: 2015
Publisher: Birkhauser Verlag AG
Keywords: Body waves
coda normalization
lapse time
quality factor
seismic attenuation
ISSN: 334553
Author Scopus IDs: 56611509800
55415037600
55682260000
55608940500
Author Affiliations: Negi, S.S., Wadia Institute of Himalayan Geology, Dehradun, Uttarakhand 248001, India
Paul, A., Wadia Institute of Himalayan Geology, Dehradun, Uttarakhand 248001, India
Joshi, A., Department of Earth Science, Indian Institute of Technology, Roorkee, India
Kamal, Department of Earth Science, Indian Institute of Technology, Roorkee, India
Corresponding Author: Negi, S.S.; Wadia Institute of Himalayan GeologyIndia
Appears in Collections:Journal Publications [ES]

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