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Modelling of earthquake locations and source parameters in Kachchh region to understand genesis of earthquakes

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Abstract

Modelling of earthquake source locations and parameters infers seismogenesis of earthquakes. In this study, we modelled the earthquake source locations through hypocenter location algorithm using the difference in arrival time of P and S waves and source parameters through the Levenberg–Marquardt non-linear inversion method using S-wave spectra. A total of 340 aftershocks of 2001 Bhuj mainshock (\( 1.8 \le M_{w} < 4.3 \)), which have occurred in Kachchh, Gujarat, India from January 2014 to January 2015, are located in this study. Out of 340 aftershocks, digital waveforms of 78 aftershocks (\( 2.2 \le M_{w} < 3.9 \)) are used for estimation of the earthquake source parameters. The results obtained from earthquake locations show two clusters of seismicity along the Kachchh Mainland Fault (KMF) and North Wagad Fault (NWF) and three felt events (\( M_{w} \ge 3.0 \)); one along the Katrol Hill Fault (KHF) (\( M_{w} = 3.3 \)), two along the Banni Fault (BF) (\( M_{w} = 3.0,3.2 \)). The generation of these three felt events is attributed to the triggering mechanisms caused by the migration of fluids or the stress pulse generated by the 20 MPa stress drop of the Mw 7.7 Bhuj earthquake. A marked concentration of events is noticed in 15–30 km depth range, which could be attributed to the presence of a mafic intrusive body, resulting in stress build-up for earthquake generation in this region. The results of source parameters; seismic moment (M0), source radius (r) and stress drop (Δσ) vary from 1.86 × 1012 to 3.2 × 1015 N m, 146–262 m and 0.04–5.73 MPa, respectively. The maximum stress drop value is estimated to be 5.73 MPa at 24 km depth for the largest studied event of \( M_{w} \) 3.9. Large stress drops are confined to the 8–33 km depth range, which indicates the probable existence of the base of the seismogenic layer in this depth range. This observed large stress drops could be attributed to stresses induced by crustal mafic intrusive bodies and the presence of aqueous fluids in the lower crust below the region.

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Acknowledgements

The authors are grateful to the Director, Council of Scientific and Industrial Research–National Geophysical Research Institute (CSIR–NGRI), Hyderabad, India, for his kind permission to publish this work. This study is also supported by the Council of Scientific and Industrial Research (CSIR) 12 Five-Year-Plan Project (Heart) at the CSIR–NGRI, in Hyderabad. BS is thankful to CSIR for providing a Senior Research Fellow (SRF) Fellowship for conducting this research at the Academy of Scientific and Innovative Research (AcSIR)–NGRI.

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  1. Academy of Scientific and Innovative Research (AcSIR), CSIR–National Geophysical Research Institute, Uppal Road, Hyderabad, India

    Bhoopendra Singh

  2. CSIR–National Geophysical Research Institute, Uppal Road, Hyderabad, India

    Bhoopendra Singh & Prantik Mandal

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  1. Bhoopendra Singh
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  2. Prantik Mandal
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Correspondence to Bhoopendra Singh.

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Communicated by M Radhakrishna

Appendix

Appendix

Table A1 Locations of Bhuj aftershocks which have occurred during January 2014 to January 2015.
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Table A2 Hypocentral parameters of aftershock events which have used for estimation of source parameters.
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Table A3 Source parameters of 78 aftershock events which have occurred during May–June 2014.
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Singh, B., Mandal, P. Modelling of earthquake locations and source parameters in Kachchh region to understand genesis of earthquakes. J Earth Syst Sci 129, 31 (2020). https://doi.org/10.1007/s12040-019-1290-7

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