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

Amrita Yadav (), D. Shashidhar, K. Mallika, N. Rao, Sunil Rohilla, H. Satyanarayana, D. Srinagesh and Harsh Gupta

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2013, vol. 69, issue 1, 965-979

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

Keywords: Koyna–Warna; RTS; Stress drop; Seismic moment; Magnitude; Focal depth (search for similar items in EconPapers)
Date: 2013
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DOI: 10.1007/s11069-013-0745-4

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