1967 Koynanagar earthquake
Encyclopedia
1967 Koynanagar Earthquake is the earthquake
Earthquake
An earthquake is the result of a sudden release of energy in the Earth's crust that creates seismic waves. The seismicity, seismism or seismic activity of an area refers to the frequency, type and size of earthquakes experienced over a period of time...

 that occurred in and around Koynanagar town in Maharashtra
Maharashtra
Maharashtra is a state located in India. It is the second most populous after Uttar Pradesh and third largest state by area in India...

 in 1967. On 11 December 1967 a 6.5 magnitude earthquake hit Koynanagar near the site of Koyna dam
Koyna Dam
The Koyna Dam is one of the largest dams in Maharashtra, India. It is a rubble-concrete dam constructed on Koyna River which rises in Mahabaleshwar, a hillstation in Sahyadri ranges...

. The earthquake claimed at least 180 human lives and injured over 1500 people. The earthquake also damaged more than 80% of the houses in Koyana Nagar Township. However it didn't cause any major damage to the Koyna dam
Koyna Dam
The Koyna Dam is one of the largest dams in Maharashtra, India. It is a rubble-concrete dam constructed on Koyna River which rises in Mahabaleshwar, a hillstation in Sahyadri ranges...

except some cracks which were repaired afterwards. There have been several earthquakes of smaller magnitude there since 1967. The deadly earthquake had caused a 10-15 cm fissure in the ground which spread over a length of 25 km.

Some geologists believe that the earthquake was due to reservoir triggered seismic activity. But senior project officials have repeatedly denied this conclusion.
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