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首页> 外文期刊>International Journal of Earth Sciences >Crustal deformation rates in Assam Valley, Shillong Plateau, Eastern Himalaya, and Indo-Burmese region from 11 years (2002-2013) of GPS measurements
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Crustal deformation rates in Assam Valley, Shillong Plateau, Eastern Himalaya, and Indo-Burmese region from 11 years (2002-2013) of GPS measurements

机译：GPS测量的11年（2002年至2013年）以来，阿萨姆山谷，西隆高原，喜马拉雅东部和印度缅甸地区的地壳形变速率

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摘要

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 similar to 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 -25.1A degrees A +/- 0.2A degrees N, -97.8A degrees A +/- 1.8A degrees E with an angular velocity of 0.533A degrees A +/- 0.10A degrees A 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 similar to 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 similar to 16 mm/year motion is accommodated in Indo-Burmese Fold and Thrust Belt, both as normal convergence (similar to 6 mm/year) and active slip (similar to 7-11 mm/year) in this region.
机译：本研究报告了使用11年（2002年至2013年）的GPS观测值，印度东北部构造复杂的当代变形。西隆高原的中部和位于阿萨姆邦谷的高原以北的一些地方表现得像一块刚性块，其印度固定南向速度接近7毫米/年。西隆高原-阿萨姆河谷中部（SH-AS）块的欧拉旋转极估计为-25.1A度A +/- 0.2A度N，-97.8A度A +/- 1.8A度E相对于印度固定参考系的角速度为0.533A度A +/- 0.10A度A Myr（-1）。位于西隆高原和Mikir断层之间的科皮里断层记录的右旋滑移为4.7 +/- 1.3毫米/年，锁定深度为10.2 +/- 1.4公里，表明阿萨姆邦谷断层破碎。目前，Mikir断层的西部边缘似乎已被锁定在阿萨姆邦地块，表明该区域的应变积累。 GPS速度的一阶弹性错位模型估计，沿喜马拉雅东部喜马拉雅山主冲断带的滑移速率为16 mm /年，该滑坡被锁定在距地面130 km的宽度至17 km的深度，并具有印度下冲作用。在主要中央推力以南的小喜马拉雅山，大约每年有9毫米的弧线法线会聚，表明高应变积累。印度-桑达板块运动（SSE）36毫米/年（SSE）中，印度缅甸褶皱和推力带大约容纳16毫米/年的运动，既有正常会聚度（类似于6毫米/年），又有活动滑移（类似于7-11毫米/年）。

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