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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/5899
Title: Coda wave attenuation characteristics for Kumaon and Garhwal Himalaya, India
Authors: Kumar A.
Sinvhal A.
Joshi A.
Kumar D.
Sandeep
Kumar P.
Published in: Natural Hazards
Abstract: Uttarakhand Himalayas are among one of the most seismically active continental regions of the world. The Himalayan belt in this region is divided into Kumaon and Garhwal Himalaya. The Kumaon Himalayas has not experienced any large earthquake in the recent past; however, this region is frequently visited by small-magnitude earthquakes. The objective of this paper was to determine regional attenuation characteristics from data recorded by local strong motion networks operating in these two regions, using coda waves. Coda wave quality factor estimates for the Kumaon and the Garhwal Himalaya region have been made in high-frequency range using single backscattering model given by Aki and Chouet (J Geophys Res 80:3322–3342, 1975). Coda waves of 30-s window length, filtered at six different frequency bands, centered at 1.5, 3.0, 6.0, 12.0, 20.0 and 28.0 Hz, have been analyzed using the single backscattering method. The frequency-dependent Qc(f) relationship for the Kumaon and Garhwal Himalaya was obtained as Qc = (65 ± 2.4)f(1.07±.04) and Qc = (96 ± 6.9)f(1.06±.04), respectively, which indicate a higher attenuating medium in the Kumaon Himalaya as compared to Garhwal Himalaya. The obtained difference of attenuation characteristics in this region is further compared with the rate of decay of peak ground acceleration with respect to magnitude and distance parameters by using regression model of peak ground acceleration obtained from available strong motion data in this region. Present studies clearly indicate that there is good evidence for high rate of attenuation in the Kumaon Himalaya as compared to the Garhwal Himalaya. © 2014, Springer Science+Business Media Dordrecht.
Citation: Natural Hazards (2015), 75(2): 1057-1074
URI: https://doi.org/10.1007/s11069-014-1370-6
http://repository.iitr.ac.in/handle/123456789/5899
Issue Date: 2015
Publisher: Kluwer Academic Publishers
Keywords: Acceleration
Attenuation
Coda Q
Himalaya
Scattering
ISSN: 0921030X
Author Scopus IDs: 57209569502
6603253484
55682260000
17035060600
55914925100
57192586891
Author Affiliations: Kumar, A., Department of Earth Sciences, Indian Institute of Technology, Roorkee, India
Sinvhal, A., Department of Earthquake Engineering, Indian Institute of Technology, Roorkee, India
Joshi, A., Department of Earth Sciences, Indian Institute of Technology, Roorkee, India
Kumar, D., Department of Geophysics, Kurukshetra University, Kurukshetra, India
Sandeep, Department of Earth Sciences, Indian Institute of Technology, Roorkee, India
Kumar, P., Department of Earth Sciences, Indian Institute of Technology, Roorkee, India
Corresponding Author: Kumar, A.; Department of Earth Sciences, Indian Institute of TechnologyIndia
Appears in Collections:Journal Publications [ES]

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