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The Arakan Mountains (Arakan Range, Rakhine Range, Rakhine Yoma , Arakan Yoma, Rakhine Roma, Arakan Roma is a mountain range in western Burma (Myanmar), between the coast of Rakhine State and the Central Burma Basin, in which flows the Irrawaddy River.
It is the most prominent of a series of parallel ridges that arc through Assam, Nagaland, Mizoram and Burma.
Prof Sarbeswar Kalita, head of the Department of Environmental Science, Gauhati University(GU) observed that the Arakan Yoma area has stressed so much which may lead to a major seismic event.
The 1762 Arakan earthquake occurred on 2 April, with an epicentre somewhere on the coast from Chittagong (modern Bangladesh) to Arakan in modern Burma. It had an estimated magnitude of as high as 8.8 on the moment magnitude scale and a maximum estimated intensity of XI (Extreme) on the Mercalli intensity scale.
It triggered a local tsunami in the Bay of Bengal and caused at least 200 deaths.
The earthquake was associated with major areas of both uplift and subsidence.
The strain may have re triggered by two earthquakes which struck the northeastern part of India twice this year.
According to Prof Kalita, "In the case of the Shillong Plateau, the centre stage of the historic 8.3 magnitude earthquake of 1897, R Bilham of the University of Colorado, USA, and VK Gaur, a former scientist of the Indian Institute of Astrophysics, Bangalore, are of the opinion that recurrence of an earthquake of the magnitude of the 1897 one would require around 400 years in that area. Both the scholars attribute this to the peculiar geological condition prevailing in the Shillong Plateau area."
While speaking on the duration pattern of earthquake jolts he said that the duration of an earthquake depends on its magnitude. The more the magnitude the jolt of an earthquake lasts longer.
He also added that some incidents of release of accumulated strain energy have taken place in the western part of the Eastern Himalayas which covers Nepal, Sikkim and Bhutan, as for the eastern part of this tectonic belt it seems to be comparatively dormant after the great August 15, 1950 earthquake.
Source: Inputs from agencies/Internet
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