This is the fourth tremor to have jolted the region so far this month - an earthquake measuring 5.3 on the Richter scale took place Monday, while another of 4.9 magnitude was experienced Aug 19, and a tremor of 5.6 intensity shook the region Aug 11.

The seven northeastern states - Assam, Meghalaya, Mizoram, Tripura, Nagaland, Arunachal Pradesh and Manipur - considered by seismologists as the sixth major earthquake prone belt in the world. The region experienced one of the worst earthquakes, measuring 8.7 on the Richter scale, in 1897 that claimed lives of more than 1,600 people.