哨兵-1 InSAR 和全球导航卫星系统对四川-云南西北部地块地震形变的约束

IF 2.7 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Xiaoxue Xu , Lingyun Ji , Rumeng Guo , Jiangcun Zhou , Liangyu Zhu , Wenting Zhang , Chuanjin Liu
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引用次数: 0

摘要

四川-云南西北地块(NW SYB)位于青藏高原东南部,具有复杂的断层系统。其详细的地壳变形对理解青藏扩张的运动学至关重要。在本研究中,我们整合了干涉合成孔径雷达(InSAR)和全球导航卫星系统(GNSS)的数据,获得了西北SYB地区高分辨率的现今变形,从而深入了解了该地区的应变分区、断层运动学和块体运动特征。我们的研究结果表明,弹性应变不仅在断层周围堆积,而且广泛分布于断层外区域。研究区内的甘孜-玉树断层甘孜段和鲜水河断层泸火段分别发生了 5.31 毫米/年和 8.41 毫米/年的左侧走向滑动运动。小尺度断层表现出一定的变形,其中理塘断层和中甸断层的左侧和右侧滑动速率分别为 2.53 毫米/年和 1.97 毫米/年。应变分区和块体运动的空间模式表明,活跃的走向滑动断层容纳了新生代块体挤压和旋转产生的位移,从而部分协调了青藏扩张的运动差异。我们的大地测量和已有的构造观测结果表明,青藏高原的东南扩张主要由西北SYB的东西向缩短和南北向延伸所吸收,可能由上地壳的大陆性走向滑动断层和下地壳的分布式剪切所容纳。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Interseismic deformation in the northwestern Sichuan-Yunnan block constrained by Sentinel-1 InSAR and GNSS

The northwestern Sichuan-Yunnan block (NW SYB), located in the southeastern Tibetan Plateau, is characterized by complex fault systems. Its detailed crustal deformation is crucial to comprehending the kinematics of the Tibetan expansion. In this study, we integrate the Interferometric Synthetic Aperture Radar (InSAR) and Global Navigation Satellite System (GNSS) data to obtain the high-resolution present-day deformation of the NW SYB, which provides insights into the strain partitioning, fault kinematics, and block motion characteristics in this region. Our results show that the elastic strain is not only built up around faults but also widely distributed in the off-fault areas. The Ganzi segment of the Ganzi-Yushu fault and the Luhuo segment of the Xianshuihe fault in the study area accommodate 5.31 mm/yr and 8.41 mm/yr left-lateral strike-slip motion, respectively. The small-scale faults show certain deformation, among which the left-lateral and right-lateral slip rates of the Litang and Zhongdian faults are 2.53 mm/yr and 1.97 mm/yr, respectively. The spatial patterns of the strain partitioning and block motion show that the active strike-slip faults accommodate displacements from Cenozoic block extrusion and rotation, which partially coordinate the kinematic discrepancy of the Tibetan expansion. Our geodetic measurements and existing structural observations indicate that the southeastward expansion of the Tibetan Plateau is absorbed mainly by E-W shortening and N-S extension in the NW SYB, may accommodated by continental strike-slip faults in the upper crust and distributed shear in the lower crust.

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来源期刊
Tectonophysics
Tectonophysics 地学-地球化学与地球物理
CiteScore
4.90
自引率
6.90%
发文量
300
审稿时长
6 months
期刊介绍: The prime focus of Tectonophysics will be high-impact original research and reviews in the fields of kinematics, structure, composition, and dynamics of the solid arth at all scales. Tectonophysics particularly encourages submission of papers based on the integration of a multitude of geophysical, geological, geochemical, geodynamic, and geotectonic methods
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