The present study reports the contemporary deformation of the tectonically complex northeast India using 11 years (2002–2013) of GPS observations. The central Shillong Plateau and few sites north of Plateau located in Assam Valley behave like a rigid block with ~7 mm/year India-fixed southward velocity. The Euler pole of rotation of this central Shillong Plateau–Assam Valley (SH–AS) block is estimated to be at −25.1° ± 0.2°N, −97.8° ± 1.8°E with an angular velocity of 0.533° ± 0.10° Myr−1 relative to India-fixed reference frame. Kopili fault located between Shillong Plateau and Mikir massif records a dextral slip of 4.7 ± 1.3 mm/year with a locking depth of 10.2 ± 1.4 km indicating the fragmentation of Assam Valley across the fault. Presently, western edge of Mikir massif appears to be locked to Assam block indicating strain accumulation in this region. First-order elastic dislocation modelling of the GPS velocities estimates a slip rate of 16 mm/year along the Main Himalayan Thrust in Eastern Himalaya which is locked over a width of 130 km from the surface to a depth of 17 km with underthrusting Indian plate. Around ~9 mm/year arc-normal convergence is accommodated in Lesser Himalaya just south of Main Central Thrust indicating high strain accumulation. Out of 36 mm/year (SSE) India-Sunda plate motion, about ~16 mm/year motion is accommodated in Indo-Burmese Fold and Thrust Belt, both as normal convergence (~6 mm/year) and active slip (~7–11 mm/year) in this region.
International Journal of Earth Sciences – Springer Journals
Published: Oct 21, 2016
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