Strongest earthquake recorded in Indian history.

The 1819 Rann of Kutch earthquake occurred at about 18:45 to 18:50 local time on 16 June. It had an estimated magnitude ranging from 7.7 to 8.2 on the moment magnitude scale and a maximum perceived intensity of XI (Extreme) on the Mercalli intensity scale. It triggered a tsunami and caused at least 1,543 deaths.
The earthquake caused an area of subsidence to that formed the Sindri Lake and a local zone of uplift to the north about 80 km long, 6 km wide and 6 m high that dammed the Puram river. This natural dam was known as the Allah Bund (“Dam of God”).

Source: http://en.wikipedia.org/wiki/1819_Rann_of_Kutch_earthquake