Seismotectonics Overview of Surma Valley in Northeast India

Seismotectonics Overview of Surma Valley in Northeast India

ABSTRACT

Surma valley and its adjoining area is one of the most complex tectonic provinces in the world. The geographical boundary with latitude 22°-26°N and longitude 90°-95°E covers a considerable portion of NER, India. Plate boundary zone and the intraplate area are the main components of NER, India. The intraplate part of the region comprises the Shillong Plateau, the Mikir Hills and the Assam valley jawed between the Himalayan and Burmese arc, Tripura folded belt, Brahmaputra Valley and the intermountain depression of upper Assam. Besides these, Surma valley is also a complex tectonic feature comprising two active faults namely Mat and Sylhet fault. All these features with its complicated geotectonic setup influence the NER, India to be seismically very active which can be revealed from smaller magnitude earthquakes that release sizable energy daily.

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