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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Tectonic geodesy revealing geodynamic complexity of the Indo-Burmese arc region, North East India
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Tectonic geodesy revealing geodynamic complexity of the Indo-Burmese arc region, North East India

机译：构造大地测量学揭示了印度东北部印度-缅甸弧区的地球动力学复杂性

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摘要

The plate boundary between India and Sunda plates across the Indo-Burmese arc (IBA) region is probably the most neglected domain as far as the plate motion, crustal deformation and earthquake occurrence processes are concerned. Because of the limitedor no geodetic measurements across the IBA region, debate continues on the most appropriate plate boundary model for the region. Subduction along this boundary occurred in geological past, but whether it is still active is a debatable issue. It is believed that the predominantly northward India-Sunda relative plate motion of about 36 mm/year is partitioned between the Indo-Burmese wedge (IBW) and the Sagaing Fault (SF). However, it is not clear how relative plate motion between India and Sunda plates isaccommodated across the IBA region - whether localized, partitioned or distributed, and in particular what is the slip rate and mode of slip accommodation across faults in the region? In such cases, Global Positioning System (GPS) measurements of crustal deformation have proved to be the best and probably the only tool. Our detailed seismo-tectonic study, crustal deformation study using high precision GPS measurements of eight years, strain rate estimates, field studies, analytical and finite element modelling of GPS data from the IBW region in North East India provide evidence for present-day active deformation front (or the plate boundary fault) between the India and Burma plates. On the basis of our extensive studies, it is now suggested that the Churachandpur-Mao Fault (CMF), a geologically older thrust fault, accommodates motion of about 16 mm/year through dextral strike-slip manner. The motion across the CMF constitutes about 43% of the relative plate motion of 36 mm/year between the India andSunda plates. The remaining motion is accommodated at SF. On the basis of modelling, which suggests low friction along the CMF, absence of low-magnitude seismicity along the CMF, lack of historic and great and major earthquakes on the CMF and regions around it, and field studies, it is proposed that the motion across the CMF occurs predominantly in an aseismic manner. Such behaviour of the CMF significantly lowers the seismic hazard in the region.
机译：就板块运动，地壳变形和地震发生过程而言，印度和India达板块之间跨越印缅弧线（IBA）区域的板块边界可能是最被忽视的领域。由于整个IBA地区的测量数据有限或没有大地测量，有关该地区最合适的板块边界模型的争论仍在继续。沿该边界的俯冲发生在地质历史中，但它是否仍处于活跃状态尚有待商issue。据信，印度-Sunda板块的主要向北相对运动约为36 mm / a，被划分为印度缅甸楔形（IBW）和实皆断裂（SF）之间。但是，目前尚不清楚印度和桑达板块之间的相对板块运动如何适应整个IBA区域-无论是局部的，分区的还是分布的，尤其是该区域断层的滑移率和滑移适应模式是什么？在这种情况下，事实证明，全球定位系统（GPS）地壳变形的测量是最好的，也许是唯一的工具。我们详细的地震构造研究，使用八年高精度GPS测量的地壳变形研究，应变率估算，现场研究，来自印度东北部IBW地区的GPS数据的分析和有限元建模为当今的主动变形提供了证据印度和缅甸板块之间的前缘（或板块边界断层）。在我们广泛研究的基础上，现在提出丘拉克汉德普-毛断层（CMF）是地质上较早的逆冲断层，通过右旋走滑方式可容纳约16毫米/年的运动。穿越CMF的运动约占印度和Sun他板块之间36 mm /年相对板块运动的43％。剩余的运动在SF处进行。在建模的基础上，表明沿CMF的摩擦较小，沿CMF没有低震级地震，在CMF及其周围地区没有历史性，大地震和大地震，并通过实地研究，提出了运动方法。跨越CMF的过程主要以抗震方式发生。 CMF的这种行为大大降低了该地区的地震危险。

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