1967 Koynanagar earthquake
|Date *||11 December 1967|
|Origin time *||22:51:23 December 10 UTC |
|Magnitude||6.6 Mw |
|Depth||15 km (9 mi) |
|Total damage||$400,000 |
|Max. intensity||VIII (Severe) |
|Casualties||177–180 dead 
2,272 injured 
|* Deprecated||See documentation.|
The 1967 Koynanagar earthquake occurred near Koynanagar town in Maharashtra, India on 11 December local time. The magnitude 6.6 shock hit with a maximum Mercalli intensity of VIII (Severe). It occurred near the site of Koyna dam, raising questions about induced seismicity, and claimed at least 177 lives and injured over 2,200.
More than 80% of the houses were damaged in Koyana Nagar Township, but it did not cause any major damage to the dam except some cracks which were quickly repaired. There have been several earthquakes of smaller magnitude there since 1967. The deadly earthquake caused a 10–15 cm (3.9–5.9 in) fissure in the ground which spread over a length of 25 kilometers (16 mi). Some geologists believe that the earthquake was due to reservoir-triggered seismic activity, but senior project officials have repeatedly denied this conclusion.
- ISC (2016), ISC-GEM Global Instrumental Earthquake Catalogue (1900–2012), Version 3.0, International Seismological Centre
- USGS (September 4, 2009), PAGER-CAT Earthquake Catalog, Version 2008_06.1, United States Geological Survey
- National Geophysical Data Center / World Data Service (NGDC/WDS), Significant Earthquake Database, National Geophysical Data Center, NOAA, doi:10.7289/V5TD9V7K
- Rajesh Menon (October 3, 2005). "Tremors may rock Koyna for another two decades". The Indian Express.
- Vishwas Kothari (15 March 2011). "Koyna to be epicentre of global study". The Times of India.
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