Low to Moderate Earthquake at 2 crustal depths in Arunachal Himalaya

The growth of Himalayas is a continuous process. This causes frequent earthquakes in the region. The study from Wadia Institute of Himalayan Geology says that the seismic activity in the eastern most part of Himalayas generate earthquake in two concentrated depths.

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According to the study, low magnitude earthquakes are caused at 1-15 km depth and earthquakes of magnitude 4 and above are generated between 25 and 35 km depth. The region between these depths are void of seismic activities. It is made of a zone of partial melts.


The growth of Himalayas is mainly due to reverse faults. In reverse faults, the rocks on the lower surface of the fault plane move under the static rocks that are on the upper surface. This is called under thrusting. The Indian plate under thrusts beneath the Eurasian plate.

The under thrusting keeps modifying drainage pattern of rivers, landforms. This is the main reason for the immense seismic activity in the Himalayan region.

TTS Zone of Himalayas: Significance:

The TTS Zone is Tuting-Tidding Suture Zone of the Eastern Himalayas. It takes a sharp southward bend in the TTS Zone. It is the zone where the Himalayas connect with the Indo-Burma range.

The TTS Zone has gained importance lately as GoI is bringing in several new infrastructure projects in the region. This includes hydroelectric power projects, road, and railway construction. Thus, it is important to understand the pattern of seismic activity in the region.

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