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History

The Koyna region located close to the west coast of India is the most outstanding example of Reservoir Triggered Seismicity (RTS), where triggered earthquakes have been occurring in a restricted area of 20x30 sq km since the impoundment of Shivajisagar Lake in 1962. These include the largest triggered earthquake of M~6.3 on Dec 10 1967, 22 earthquakes of M>5, about 200 earthquakes of M~4, and several thousand smaller earthquakes since 1962.

The RTS was further enhanced by impoundment of the nearby located Warna reservoir in 1993. There is no other source of seismic activity within 50 km of the Koyna Dam. The continuing seismicity at Koyna for the past five decades, with most of the events occurring within a depth of ~7km, makes it the most suitable site for deep drilling and setting up of an observatory at depth to enable earthquake related near field observations.