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Attenuation of High Frequency P and S Waves in the Gujarat Region, India

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Abstract

The local earthquake waveforms recorded on broadband seismograph network of Institute of Seismological Research in Gujarat, India have been analyzed to understand the attenuation of high frequency (2–25 Hz) P and S waves in the region. The frequency dependent relationships for quality factors for P (Q P) and S (Q S) waves have been obtained using the spectral ratio method for three regions namely, Kachchh, Saurashtra and Mainland Gujarat. The earthquakes recorded at nine stations of Kachchh, five stations of Saurashtra and one station in mainland Gujarat have been used for this analysis. The estimated relations for average Q P and Q S are: Q P = (105 ± 2) f 0.82 ± 0.01, Q S = (74 ± 2) f 1.06 ± 0.01 for Kachchh region; Q P = (148 ± 2) f 0.92 ± 0.01, Q S = (149 ± 14) f 1.43 ± 0.05 for Saurashtra region and Q P = (163 ± 7) f 0.77 ± 0.03, Q S = (118 ± 34) f 0.65 ± 0.14 for mainland Gujarat region. The low Q (<200) and high exponent of f (>0.5) as obtained from present analysis indicate the predominant seismic activities in the region. The lowest Q values obtained for the Kachchh region implies that the area is relatively more attenuative and heterogeneous than other two regions. A comparison between Q S estimated in this study and coda Q (Qc) previously reported by others for Kachchh region shows that Q C > Q S for the frequency range of interest showing the enrichment of coda waves and the importance of scattering attenuation to the attenuation of S waves in the Kachchh region infested with faults and fractures. The Q S/Q P ratio is found to be less than 1 for Kachchh and Mainland Gujarat regions and close to unity for Saurashtra region. This reflects the difference in the geological composition of rocks in the regions. The frequency dependent relations developed in this study could be used for the estimation of earthquake source parameters as well as for simulating the strong earthquake ground motions in the region.

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Acknowledgments

The authors are grateful the reviewers for their constructive comments. The authors are grateful to their respective organizations for support. The study was supported by the Department of Science and Technology/Ministry of Earth Sciences, Government of India.

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Authors and Affiliations

  1. Institute of Seismological Research, Raisan, Gandhinagar, 382 009, Gujarat, India

    Sumer Chopra & B. K. Rastogi

  2. Department of Geophysics, Kurukshetra University, Kurukshetra, 132119, Haryana, India

    Dinesh Kumar

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  1. Sumer Chopra
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Chopra, S., Kumar, D. & Rastogi, B.K. Attenuation of High Frequency P and S Waves in the Gujarat Region, India. Pure Appl. Geophys. 168, 797–813 (2011). https://doi.org/10.1007/s00024-010-0143-8

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