Geology
The region of Saurashtra is a geologically active part of West India, and falls in the seismic zone 3 of the Zoning Map of the Bureau of Indian Standards. The region as a whole and the area around Bhavnagar in particular has been tectonically unstable.
Between 9 August 2000 and 15 December 2000, there was a series of earthquakes in east Saurashtra with epicenters in Bhavnagar. 132 earthquakes of 0.5M to 3.8M were recorded. There were five earthquakes greater than 3M, with a maximum magnitude of 3.8. These events were confined to an area which covered southern part of the Bhavnagar city and Tarsamiya village on the outskirts of the town. There were no loss of life recorded during this earthquake.
According to historical records, an earthquake of magnitude 7 occurred near Bhavnagar in February 1705. Earthquake swarm activity also occurred in and around Paliyad (60 km north of Bhavnagar) during July—August 1938 for about two months, with four earthquakes of magnitude greater than or equal to 5 and a maximum magnitude of 6.0.
Read more about this topic: Bhavnagar