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首页> 外文期刊>Journal of Asian earth sciences >Estimation of strain distribution using GPS measurements in the Kumaun region of Lesser Himalaya
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Estimation of strain distribution using GPS measurements in the Kumaun region of Lesser Himalaya

机译：在小喜马拉雅山的库玛恩地区使用GPS测量估算应变分布

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摘要

The continuous process of continent-continent collision between the Indian and the Eurasian plates has led to the formation of the Himalayan range and continuously caused earthquakes in the region. Large earthquakes with magnitudes of 8 and above occur in this region infrequently, releasing the elastic strain accumulated over years around the plate boundary. Geodetic measurements can help estimate the strain distribution along the fault system. These measurements provide information on active deformations and associated potential seismic hazards along the Himalayan arc. In order to understand the present deformation around the plate boundary, we collected GPS data during three campaigns in the years of 2005-2007 at 16 sites in the Kumaun region of the Lesser Himalaya. Horizontal velocity vectors estimated in ITRF2000 are found to be in the range of 41-50 mm/yr with an uncertainty level of the order of 1 mm/ yr. The velocity field indicates that the present convergence of around 15 mm/yr takes place in the Kumaun Himalaya. Further, we estimate the strain components in the study area for understanding the currently active tectonic process in the region. The estimated dilatational strain indicates that the northern part near the Main Central Thrust (MCT) is more compressional than the southern part. Maximum shear strain is mostly accommodated in the northern part too. The maximum shear and dilatational strain rates are about 1.0 and 0.5 μstrain/yr. It is seen that the distribution of high shear strain spatially correlates with seismicity. The maximum of extensional and compressional strains due to the force acting along the Main Central Thrust (MCT) in the NW-SE direction are found to be 0.4 and 0.1 μstrain/yr, respectively. The maximum shear strain in the northern part of the Himalaya appears to be associated with the convergence of the region proposed by other geophysical studies.
机译：印度洋与欧亚大陆板块之间不断发生的大陆-大陆碰撞过程，导致了喜马拉雅山脉的形成，并在该地区不断引起地震。在该区域很少发生8级以上的大地震，释放了多年以来在板块边界附近累积的弹性应变。大地测量可以帮助估计沿断层系统的应变分布。这些测量提供了有关沿喜马拉雅弧线的主动变形和相关的潜在地震危险的信息。为了了解当前板块边界附近的变形，我们在2005年至2007年的3次运动中收集了GPS数据，这些运动在小喜玛拉雅山库马恩地区的16个地点进行。发现ITRF2000中估计的水平速度矢量在41-50 mm / yr的范围内，不确定性级别为1 mm / yr的数量级。速度场表明，目前的约15毫米/年的会聚发生在库马云喜马拉雅山。此外，我们估计研究区域中的应变分量，以了解该地区当前活跃的构造过程。估计的膨胀应变表明，靠近主中心推力（MCT）的北部比南部的受压更大。最大的剪切应变也主要容纳在北部。最大剪切应变和扩张应变率约为1.0和0.5μs/ yr。可以看出，高剪切应变的分布在空间上与地震活动有关。发现由于沿NW-SE方向沿主中心推力（MCT）作用的力引起的最大拉伸应变和压缩应变分别为0.4和0.1μs/ yr。喜马拉雅山脉北部的最大剪切应变似乎与其他地球物理研究提出的区域收敛性有关。

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  • 来源
    《Journal of Asian earth sciences》 |2010年第6期|p.658-667|共10页
  • 作者

    M. Ponraj; rnS. Miura; rnC.D. Reddy; rnS.K. Prajapati; rnS. Amirtharaj; rnS.H. Mahajan;

  • 作者单位

    Indian Institute of Geomagnetism, New Panvel, Navi Mumbai 410 218, India;

    rnGraduate School of Science, Tohoku University, Aoba-ku, Sendai 9808578, Japan;

    rnIndian Institute of Geomagnetism, New Panvel, Navi Mumbai 410 218, India;

    rnIndian Institute of Geomagnetism, New Panvel, Navi Mumbai 410 218, India;

    rnIndian Institute of Geomagnetism, New Panvel, Navi Mumbai 410 218, India;

    rnIndian Institute of Geomagnetism, New Panvel, Navi Mumbai 410 218, India;

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  • 正文语种 eng
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  • 关键词

    convergence; strain; deformation; lesser himalaya; GPS;

    机译：收敛;应变;形变;小喜马拉雅山全球定位系统;

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