Consider the following statements regarding major faults contributing to seismic activity in Northeast India:
- The Kopili Fault is a seismically active fault associated with the Main Himalayan Thrust (MHT) and extends across Assam and Arunachal Pradesh.
- The Lohit Thrust and Naga Thrust are part of the Eastern Himalayan tectonic framework, contributing to high seismicity in the region.
- The Disang Thrust and Haflong Fault are associated with the Shillong Plateau’s intra-plate seismic activity, which has historically recorded major earthquakes.
- The Dhubri Fault and Ultapani Thrust mark the transition between the Indian Plate and the Indo-Myanmar Subduction Zone, influencing seismic patterns in lower Assam and adjoining areas.
Which of the above statements is/are correct?
(A) 1, 2, and 4 only
(B) 1 and 3 only
(C) 2 and 4 only
(D) 1, 2, 3, and 4
Correct Answer: (A) 1, 2, and 4 only
Statement 1 is correct: The Kopili Fault is an active seismic zone associated with the Main Himalayan Thrust (MHT), known for moderate to high earthquakes in Assam and Arunachal Pradesh.
Statement 2 is correct: The Lohit Thrust and Naga Thrust are part of the Eastern Himalayan and Indo-Myanmar tectonic system, playing a crucial role in regional seismicity.
Statement 3 is incorrect: The Disang Thrust and Haflong Fault are linked to the Indo-Myanmar Orogenic Belt, not the Shillong Plateau, which is more influenced by faults like the Dauki Fault.
Statement 4 is correct: The Dhubri Fault and Ultapani Thrust represent structural weaknesses at the boundary between the Indian Plate and Indo-Myanmar Tectonics, affecting Assam’s seismic activity.
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