Role of transverse tectonics in the Himalayan collision: Further evidences from two contemporary earthquakes |
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Authors: | Sujit Dasgupta Basab Mukhopadhyay Manoj Mukhopadhyay D. R. Nandy |
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Affiliation: | 127. Ex Geological Survey of India, Kolkata, India 227. Geological Survey of India, Central Headquarters, 27 J.L. Nehru Road, Kolkata, 700 016, India 327. Department of Geology & Geophysics, King Saud University, P.O. Box 2455, Riyadh, 11451, Kingdom of Saudi Arabia
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Abstract: | Two contemporary earthquakes originating in the central Himalayan arc and its foredeep (Sikkim earthquake of 18.09.2011, Mw 6.9, h: 10–60 (?) km and Bihar-Nepal earthquake of 20.08.1988, Mw 6.8, h: 57 km) are commonly associated with transverse lineaments/faults traversing the region. Such lineaments/faults form active seismic blocks defining promontories for the advancing Indian Craton. These actually produce conjugate shear faulting pattern suggestive of pervasive crustal interplay deep inside the mountains. Focal mechanism solutions allow inferring that large part of the current convergence across the central Himalayan arc is accommodated by lateral slip. Similar slip also continues unabated in the densely populated foredeep for distances up to several tens of kilometers south of the Main Boundary Thrust (MBT). |
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