Abstract
Several strong to great earthquakes occurred in northeast India, indicating that the region is seismically very active. For a better understanding of the complex nature of tectonics in the Eastern Himalaya, a frequency-dependent attenuation relation based on coda waves is developed. The backscattering model of Aki and Chouet (J. Geophys. Res. 80: 3322–3342, 1975) is used to study the dependency of coda-Q on lapse time windows and frequency. Analysis of waveforms from 104 local earthquakes recorded by a five-station local seismological network provides frequency-dependent coda-Q relations: Qc = (61±8)f(1.23±0.03) (30s lapse time), Qc = (83±9)f(1.17±0.03) (40s lapse time) and Qc = (104±8)f(1.15±0.04) (50s lapse time). These estimated relationships clearly demonstrate Qc's depth dependency, as longer lapse time windows would carry deeper depth information. Also, the increase in the value of Q0 (Qc at 1 Hz) with lapse time depicts heterogeneity decrease with depth. The observed quality factor is highly variable with the frequency and lapse time. The higher the value of ‘n,' the more seismically active the region. The observed Qc relation is found equivalent to other similar seismically active regions.
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Acknowledgements
The authors are grateful to IIT Roorkee and Prof. H R Wason for providing the data. Authors acknowledge the contribution of the Generic Mapping Tool (GMT). They are thankful to editors Prof. Somnath Dasgupta and Prof. Anand Joshi and also two anonymous reviewers for providing constructive comments to improve the quality of the manuscript.
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Rohtash Kumar: Code and manuscript writing; Amritansh Rai: Manuscript revision and data analysis; Prashant Kumar Singh, S P Singh and Vinay Kumar: Data analysis; Raghav Singh and S P Maurya: Manuscript compilation; S C Gupta and Arjun Kumar and G P Singh: Manuscript review and overall supervision.
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Communicated by Somnath Dasgupta
Corresponding editor: Somnath Dasgupta
Rohtash Kumar: deceased on 3rd May, 2023.
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Kumar, R., Rai, A., Singh, R. et al. Understanding the physical state and tectonics of Eastern Himalaya using coda wave attenuation. J Earth Syst Sci 132, 186 (2023). https://doi.org/10.1007/s12040-023-02197-9
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DOI: https://doi.org/10.1007/s12040-023-02197-9