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Unfamiliar Lineament Among Factors Causing Earthquakes in Assam

Unfamiliar Lineament Among Factors Causing Earthquakes in Assam

Context:

The region of North-Eastern India is demarcated as Seismic zone V, indicating a zone of high earthquake vulnerability.

Details:

  • The movement of the Indian Plate towards the North-East direction is on a collision course with the Eurasian plate part of the Himalayan Region.
  • The frequent Earthquakes in northern Assam are a result of an unfamiliar lineament, which is a linear feature in a landscape dependent on the underlying geological structure like a fault.
  • The Sonitpur district of Assam where earthquakes occurred recently lies within a tectonically complex triangular area bounded by:

1. a north-south trending lineament,

2. the northwest-southeast trending Kopili Fault, and

3. the east-west trending Atherkhet Fault.

  • The other faults spread across the northeast and affecting the region of Sonitpur are the Siang Fracture, Namula Thrust, Yemla Fault and the Canyon Thrust.
  • Active faults in the region include the Main Central Thrust, Main Boundary Thrust, Main Himalayan Thrust and various other subsidiary faults.
  • The north-south lineament and the oblique convergence of the Indian plate in addition to the Atherkhet and Kopili faults are the major cause of repetitive earthquakes.

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