A total of 10 aftershocks were felt in the day after a massive earthquake of 6.4 magnitude jolted Assam and other north eastern states in the morning causing widespread damage.
According to the report, a total of 6 aftershocks of the magnitude of 3.2 to 4.7 on the Richter scale were felt within 2 and half hours of the main shock.
The preliminary analysis shows that the event is located near to Kopili Fault closer to Himalayan Frontal Thrust (HFT).
The area is seismically very active falling in the highest Seismic Hazard zone V associated with collisional tectonics where Indian plate subducts beneath the Eurasian Plate.
The historical and instrumentally recorded earthquake data (NCS catalogue) reveals that the region is affected by moderate to large earthquakes and the most prominent events among those are the earthquake of Magnitude 6.0 on the Richter scale that occurred on July 29, 1960 in Assam.
“Damages to buildings also reported within 100 km from epicentre in areas of Sonitpur, Nagaon, Guwahati as received from Central Seismological Observatory, NCS, Shillong and Regional Meteorological Centre IMD, Guwahati,” officials said.