Abstract
The present work explores the attenuation characteristics of Garhwal and Kumaon regions of northwest Himalaya, India. A comparative study of P- and S-wave quality factors (Qα and Qβ) is used to appreciate the different attenuation characteristics of these two regions. The strong motion data of 105 local earthquakes recorded in Garhwal and Kumaon region are considered for the analysis. The coda normalization method is implemented to compute Qα and Qβ at each recording site of form Q(f) = Qofn. The regional relationship obtained by using site-specific quality factor relations is Qα(f) = (55 ± 3)f(0.90±0.06), Qβ(f) = (74 ± 5)f(0.87±0.08) for Garhwal region and Qα(f) = (34 ± 1)f(0.94±0.03), Qβ(f) = (58 ± 2)f(0.90±0.02) for Kumaon region, which clearly suggest the existence of spatial variation of attenuation properties in these two regions. The Kumaon region has low Qα and Qβ as compared to Garhwal, which means Kumaon region has high rate of attenuation than Garhwal region, as Q is inversely proportional to the attenuation. Hence, based on obtained attenuation properties it is proposed that Garhwal region has high seismic hazard potential zone as compared to its adjacent Kumaon region. The high value of Qβ/Qα (˃ 1) obtained in the present work indicates the presence of fluid or partially saturated rocks in the earth crust for both Garhwal and Kumaon regions. The variable value of ratio (Qβ/Qα) obtained for Garhwal and Kumaon region specifies the different fluid saturations or fluid types existing for both the regions, and it may be the possible reason of distinct attenuation properties of these two regions.
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Acknowledgements
The authors wish to thank the Director, Wadia Institute of Himalayan Geology (WIHG), Dehradun, for providing permission to publish and supporting this research work. The authors sincerely acknowledge the strong motion data provided by the WIHG, Department of Earth Sciences, Earthquake Engineering Department, Indian Institute of Technology, Roorkee, India, and website www.pesmos.in. The International Seismological Centre is acknowledged for providing earthquakes bulletin through the site (www.isc.ac.uk). The present work is an outcome of sponsored project funded by Science and Engineering Research Board, Department of Science and Technology (DST), with Grant No. ECR/2017/000367.
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Monika, Kumar, P., Sandeep et al. Spatial variability studies of attenuation characteristics of Qα and Qβ in Kumaon and Garhwal region of NW Himalaya. Nat Hazards 103, 1219–1237 (2020). https://doi.org/10.1007/s11069-020-04031-7
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DOI: https://doi.org/10.1007/s11069-020-04031-7