Discussion
Which one of the following earthquakes was triggered by impoundment of water reservoirs ?
Answer: C
The reservoir-triggered earthquake is the 1967 Koyna earthquake.
The Koyna Dam in Satara district, Maharashtra, was impounded in 1962. Seismic activity increased after filling, and on 11 December 1967 a magnitude 6.3 earthquake struck, killing about 180 people. It is the largest known reservoir-triggered earthquake, and seismicity in the Koyna-Warna region still follows the annual loading and unloading of the reservoirs.
The 1934 Bihar-Nepal and 1950 Assam (Assam-Tibet) earthquakes were great tectonic earthquakes of the Himalayan collision zone. The 1995 Kobe earthquake was caused by slip on an active strike-slip fault in Japan. None was triggered by a reservoir.
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