Recent Seismicity Patterns and Microearthquake Activity on an Active Intraplate Fault System at Koyna-Warna, Western India
Authors
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CSIR- National Geophysical Research Institute, Uppal Road, Hyderabad – 500007
D. Shashidhar -
CSIR- National Geophysical Research Institute, Uppal Road, Hyderabad – 500007
K. Mallika
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CSIR- National Geophysical Research Institute, Uppal Road, Hyderabad – 500007
C. R. Mahato
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CSIR- National Geophysical Research Institute, Uppal Road, Hyderabad – 500007
B. S. Maity
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CSIR- National Geophysical Research Institute, Uppal Road, Hyderabad – 500007
H. V. S. Satyanarayana
DOI:
https://doi.org/10.1007/s12594-017-0794-5Abstract
Recent seismic activity of the Koyna region, western India is reported in this article. The Koyna region is considered to be one of the premier sites of reservoir triggered seismicity worldwide and it has been quite active since the initial impoundment of Shivaji Sagar Lake, north of Koyna Dam, during 1962 and nearby Warna Reservoir in 1985. Recently, a borehole seismic network consisting of 6 seismometers is deployed below the Deccan Traps to monitor the earthquakes in the study region, which recorded a large number of microearthquakes. A dense network of 23 surface broadband seismometers was also operative during the study period. A total of 2478 earthquakes of ML -0.8 to 3.7 recorded by the borehole seismic network, occurred during January 2016 to May 2017. Seismicity patterns in the recent time, which includes a few new zones of intense seismicity clusters in the vicinity of the borehole locations, are identified. Reservoir water levels are found to be strongly associated with the seismicity patterns. The seismicity is mostly concentrated in the vicinity of the Donachiwada fault and Warna during January - May, whereas it spreads during June - December. 'b' values have been estimated and found to be varying from 0.74 to 0.93. Seismicity continues to be present in the identified block where the pilot borehole has been drilled.
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