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Title: Attenuation of high-frequency P and S waves in Garhwal Himalaya, India
Authors: Tripathi J.N.
Singh P.
Sharma M.L.
Published in: Tectonophysics
Abstract: Tectonics of a region plays important role on the attenuation characteristics of the region. Attenuation characteristics have been estimated to understand the effect of the heterogeneity of the region in a tectonically active Garhwal region of Himalaya. Seismic body wave attenuation characteristics in the region is studied using 234 short-period, seismic observations from local events. The P-wave attenuation (QP-1) and S-wave attenuation (QS-1) were estimated by applying the state-of-the-art, extended coda normalization method for the frequency range from 1.5 to 24Hz. Estimates of QP-1 and QS-1 decrease from (15.86±0.90)×10-3 and (5.35±0.51)×10-3 at 1.5Hz to (0.54±0.11)×10-3 and (0.34±0.06)×10-3 at 24Hz, respectively. The values of QP-1 and QS-1 show strong frequency dependence and fit the power-law relation QP-1(f)=(27.43±3.15)×10-3f (-1.16±0.06) and QS-1(f)=(8.05±0.74)×10-3f (-0.93±0.05), respectively. Obtained results are in the range of those reported for QP-1 and QS-1 of the other seismically active regions. The ratio of QP-1/QS-1 is larger than unity in the entire analyzed frequency range and may suggest high degree of heterogeneity in the region. © 2014 Elsevier B.V.
Citation: Tectonophysics (2014), 636(): 216-227
Issue Date: 2014
Publisher: Elsevier
Keywords: Body waves
Garhwal Himalayas
Quality factor
Seismic attenuation
Wave propagation
ISSN: 401951
Author Scopus IDs: 7003845661
Author Affiliations: Tripathi, J.N., Department of Earth and Planetary Sciences, University of Allahabad, Allahabad, 211002, India
Singh, P., Department of Earth and Planetary Sciences, University of Allahabad, Allahabad, 211002, India
Sharma, M.L., Department of Earthquake Engineering, Indian Institute of Technology, Roorkee, 247667, India
Funding Details: Authors are grateful to the Editor Prof. Rob Govers, and two anonymous reviewers for their valuable comments and suggestions that improved the quality of the paper. Authors are also thankful to Mr. Shakeel Asharaf for his help in preparation of Fig. 1 . The data used for the study were acquired under the research project funded to MLS by Department of Science and Technology (DST), New Delhi. Thus, the financial grant by DST is thankfully acknowledged.
Corresponding Author: Tripathi, J.N.; Department of Earth and Planetary Sciences, University of AllahabadIndia
Appears in Collections:Journal Publications [EQ]

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