Abstract
In order to better understand the attenuation characteristics in the crust of the central and western Tien Shan orogenic belt, we investigate both Qp and Qs values by applying the extended coda-normalization method. We estimate the frequency-dependent attenuation of both P and S waves in the frequency band of 1.0–20.0 Hz using data from local networks. The average frequency relations of Qp and Qs have been derived as Qp = (61 ± 9) × f(1.21±0.08) and Qs = (77 ± 6) × f(1.11±0.04) by fitting a power-law frequency dependence model for the study region. The low Q0 and high η values indicate that the central and western Tien Shan is a tectonically and seismically active region. We also find lateral variations of both Qp,s and Qs/Qp values, reflecting complex tectonic structures in the study area. In general, the relatively high-attenuation areas corresponding to tectonically active regions are found beneath mountainous ranges in the central Tien Shan whereas the relatively low-attenuation areas are associated with stable regions, such as Fergana Basin and Issyk-Kul Lake. Besides, regions in the central Tien Shan with Qs/Qp > 1 are likely partially saturated with fluids or rich in scattering heterogeneities, whereas regions in the western Tien Shan display Qs/Qp < 1, possibly suggesting almost complete fluid saturation.
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taken from the following papers: Kanto, Japan (Yoshimoto et al. 1993); Oaxaca, Mexico (Castro and Munguia 1993); Southeastern South Korea (Chung and Sato 2001); Central South Korea (Kim et al. 2004); Northwestern Turkey (Bindi et al. 2006); Koyna, India (Sharma et al. 2007); East-Central Iran (Ma’ hood et al. 2009); Bhuj, India (Padhy 2009); Kumaun Himalaya (Singh et al. 2012); Kinnaur Himalaya, India (Kumar et al. 2014); Garhwal Himalaya, India (Negi et al. 2015); Alborz, Iran (Farrokhi and Hamzehloo 2017); Western part of Iran (Fard et al. 2019)
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Acknowledgements
We would like to thank the Editor Tomas Fischer and two reviewers for their constructive comments, which help improve the manuscript. This work is supported by the NSFC project (no. 41803034) and International Partnership Program of Chinese Academy of Sciences (Grant no. 132744KYSB20190039). The facilities of IRIS Data Services, and specifically the IRIS Data Management Center, were used for access to waveforms, related metadata, and/or derived products used in this study. IRIS Data Services are funded through the Seismological Facilities for the Advancement of Geoscience and EarthScope (SAGE) Proposal of the National Science Foundation under Cooperative Agreement EAR-1261681. The figures are made with GMT5 (Wessel et al. 2013) and Matplotlib (Hunter 2007). ObsPy (Beyreuther et al. 2010) is used to analyze and process the seismograms.
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Ma, X., Huang, Z. Attenuation of High-Frequency P and S Waves in the Crust of Central and Western Tien Shan. Pure Appl. Geophys. 177, 4127–4142 (2020). https://doi.org/10.1007/s00024-020-02504-1
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DOI: https://doi.org/10.1007/s00024-020-02504-1