Abstract
Northeast India and its surrounding regions are seismically one of the six most active regions of the world which has experienced 19 large (M ≥ 7) including 3 great earthquakes (M ≥ 8). The region has five major tectonic domains having its own evolutionary history and characteristics. Seismicity and seismotectonic correlation of the region is studied by earthquake distribution pattern in different magnitude and depth relating to each tectonic domain dividing the area into five blocks. It has been observed that the Main Central Thrust (MCT) and Main Boundary Thrust (MBT) along the line of collision between the Indian and Eurasian plate are predominant site of shallow earthquake events of the area to the north whereas Indo-Burma belt is the prime area of intermediate earthquakes evidencing the continuous subduction of Indian plate to the Burmese to the east. Besides intra plate activity in Shillong plateau and Mikir Hills is also shaking the region. The epicentral concentration around Kopili lineament clearly shows that this is the most active lineament of Assam valley.
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