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首页> 外文期刊>Journal of Asian earth sciences >Present-day crustal deformation characteristics of the southeastern Tibetan Plateau and surrounding areas by using GPS analysis
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Present-day crustal deformation characteristics of the southeastern Tibetan Plateau and surrounding areas by using GPS analysis

机译：基于GPS分析的青藏高原东南部及周边地区现今地壳形变特征

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The southeastern Tibetan Plateau and surrounding areas comprise a typical tectonic belt in mainland China, characterized by a complex geological background and intense tectonic activity. We study present-day crustal deformation characteristics of this region based on GPS data for the periods 1999-2007 and 2009-2011. We first analyze the variations in crustal motion and strain rate, and then discuss the 3D crustal motion and local subblock activities, as well as the correlation between the intensity of crustal activity and the strain rate distribution. Finally, we explain the present-day geodynamic characteristics of the region. Our results indicate that the entire region shows overall clockwise motion with respect to the stable Eurasian Plate. The tectonic boundary belts between this region and the South China Block display significant compressional strain, accompanied by associated extensional strain. Relatively high maximum shear strain and the transition zones of the significant plane strain gradients are also mainly concentrated along the Ganzi-Yushu-Xianshuihe, Anninghe-Zemuhe-Xiaojiang, Lijiang-Xiaojinhe, and Red River faults, as well as the western and southern Yunnan Province. 3D crustal velocities further reflect significant differences in tectonic activity between different structural belts. We conclude that the regions showing higher shear strain and the transition zones of the significant plane strain gradients correspond to the areas with frequent earthquakes. According to the crustal deformation and strain characteristics, we infer that the present-day geodynamic setting of the region is related to the ongoing India-Eurasia collision and the associated resistance of the stable Alashan, Ordos, and South China blocks, resulting in the extrusion of the southeastern Tibetan Plateau crustal material with an overall clockwise flow around the Eastern Himalayas and significant compressional strain along the tectonic boundary belts. Furthermore, notable compressional strain and enhanced sub-block motions occurred around the Longmenshan fault area following the Wenchuan earthquake.
机译：青藏高原东南部及周边地区是中国大陆典型的构造带，其地质背景复杂，构造活动活跃。我们根据1999-2007年和2009-2011年的GPS数据研究了该地区的当今地壳形变特征。我们首先分析地壳运动和应变率的变化，然后讨论3D地壳运动和局部子块活动，以及地壳活动强度与应变率分布之间的相关性。最后，我们解释了该地区的当今地球动力学特征。我们的结果表明，整个区域相对于稳定的欧亚板块显示出整体顺时针运动。该区域与华南地块之间的构造边界带显示出明显的压缩应变，并伴有相关的伸展应变。最大相对最大剪切应变和明显的平面应变梯度过渡带也主要集中在赣子-玉树-咸水河，安宁河-泽木河-小江，丽江-小金河和红河断裂以及云南西部和南部省。 3D地壳速度进一步反映了不同构造带之间构造活动的显着差异。我们得出的结论是，显示较高剪切应变的区域和显着的平面应变梯度的过渡区域与地震频发的区域相对应。根据地壳变形和应变特征，我们推断该地区当前的地球动力学环境与正在进行的印度-欧亚大陆碰撞以及稳定的阿拉善，鄂尔多斯和华南块体的相关阻力有关，从而导致了挤压青藏高原东南部的地壳物质，在喜马拉雅东部周围有整体顺时针流动，并且沿构造边界带有明显的压缩应变。此外，汶川地震后，龙门山断裂带附近出现明显的压应变和次块运动。

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