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首页> 外文期刊>Bulletin of the Seismological Society of America >Global Positioning System (GPS) Measurements of Crustal Deformation across the Frontal Eastern Himalayan Syntaxis and Seismic-Hazard Assessment
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Global Positioning System (GPS) Measurements of Crustal Deformation across the Frontal Eastern Himalayan Syntaxis and Seismic-Hazard Assessment

机译：全球定位系统（GPS）测量东额喜马拉雅前缘地壳的地壳变形和地震危险性评估

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摘要

Tectonics and earthquake occurrence processes of the two Himalayan syntaxes are complex. Their limited accessibility has restricted seismological investigations in these regions, resulting in poor knowledge about the geodynamic processes. Here, we provide Global Positioning System (GPS) measurements of crustal deformation across the frontal eastern Himalayan syntaxis (EHS). In this region, the Indian plate obliquely underthrusts the Eurasian plate, and the eastward-extruding Tibetan plateau moves around the EHS due to India-Eurasia convergence. Our GPS measurements in the region suggest that the frontal EHS accommodates at least ～20 mm=yr of oblique convergence between the Indian and Eurasian plates. Under the frontal EHS, on which this convergence is accommodated through a stick-and-slip process, the 65 km wide main thrust zone of the plate boundary interface currently is locked. These measurements and the limited information about the great 1950 Assam earthquake (M_w 8.6) suggest that this great earthquake probably occurred in the EHS.
机译：两种喜马拉雅语法的构造和地震发生过程很复杂。它们的可及性有限，限制了这些地区的地震学研究，导致对地球动力学过程的了解不足。在这里，我们提供了喜马拉雅前额叶东部语法树（EHS）上地壳变形的全球定位系统（GPS）测量。在该地区，印度板块斜向俯冲于欧亚板块，由于印度-欧亚大陆的融合，向东挤压的青藏高原绕着EHS移动。我们在该地区的GPS测量结果表明，额叶EHS至少在印度和欧亚板块之间的倾斜汇聚处约〜20 mm = yr。在额叶EHS之下（通过粘滑过程实现了这种收敛），目前已锁定了板块边界界面的65 km宽的主推力区。这些测量结果和有关1950年阿萨姆邦大地震（M_w 8.6）的有限信息表明，这次大地震可能发生在EHS中。

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