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Source parameters of earthquakes in the reservoir-triggered seismic (RTS) zone of Koyna–Warna, Western India

Author

Listed:
  • Amrita Yadav
  • D. Shashidhar
  • K. Mallika
  • N. Rao
  • Sunil Rohilla
  • H. Satyanarayana
  • D. Srinagesh
  • Harsh Gupta

Abstract

New empirical relations are derived for source parameters of the Koyna–Warna reservoir-triggered seismic zone in Western India using spectral analysis of 38 local earthquakes in the magnitude range M L 3.5–5.2. The data come from a seismic network operated by the CSIR-National Geophysical Research Institute, India, during March 2005 to April 2012 in this region. The source parameters viz. seismic moment, source radius, corner frequency and stress drop for the various events lie in the range of 10 13 –10 16 Nm, 0.1–0.4 km, 2.9–9.4 Hz and 3–26 MPa, respectively. Linear relationships are obtained among the seismic moment (M 0 ), local magnitude (M L ), moment magnitude (M w ), corner frequency (fc) and stress drop (∆σ). The stress drops in the Koyna–Warna region are found to increase with magnitude as well as focal depths of earthquakes. Interestingly, accurate depths derived from moment tensor inversion of earthquake waveforms show a strong correlation with the stress drops, seemingly characteristic of the Koyna–Warna region. Copyright Springer Science+Business Media Dordrecht 2013

Suggested Citation

  • Amrita Yadav & D. Shashidhar & K. Mallika & N. Rao & Sunil Rohilla & H. Satyanarayana & D. Srinagesh & Harsh Gupta, 2013. "Source parameters of earthquakes in the reservoir-triggered seismic (RTS) zone of Koyna–Warna, Western India," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 69(1), pages 965-979, October.
    • Handle: RePEc:spr:nathaz:v:69:y:2013:i:1:p:965-979
    DOI: 10.1007/s11069-013-0745-4
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    References listed on IDEAS

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    1. Pinki Hazarika & M. Ravi Kumar, 2012. "Seismicity and source parameters of moderate earthquakes in Sikkim Himalaya," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 62(3), pages 937-952, July.
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