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首页> 外文期刊>Journal of geophysical research. Solid earth: JGR >Interseismic and Postseismic Shallow Creep of the North Qaidam Thrust Faults Detected with aMultitemporal InSAR Analysis
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Interseismic and Postseismic Shallow Creep of the North Qaidam Thrust Faults Detected with aMultitemporal InSAR Analysis

机译：北柴达木推力故障检测到具有仿药令人生作分析的苦损和后近蠕变

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Understanding the mechanisms by which earthquake cycles produce folding and accommodate shortening is essential to quantify the seismic potential of active faults and integrate aseismic slip within our understanding of the physical mechanisms of the long-term deformation. However, measuring such small deformation signals in mountainous areas is challenging with current space-geodesy techniques, due to the low rates of motion relative to the amplitude of the noise. Here we successfully carry out a multitemporal Interferometric Synthetic Aperture Radar analysis over the North Qaidam fold-thrust system in NE Tibet, where eightMw >5.2 earthquakes occurred between 2003 and 2009.We report various cases of aseismic slip uplifting the thickened crust at short wavelengths.We provide a rare example of a steep, shallow, 13-km-long and 6-km-wide afterslip signal that coincides spatially with an anticline and that continues into 2011 in response to a Mw 6.3 event in 2003.We suggest that a buried seismic slip during the 2003 earthquake has triggered both plastic an-elastic folding and aseismic slip on the shallow thrusts.We produce a first-order two-dimensional model of the postseismic surface displacements due to the 2003 earthquake and highlight a segmented slip on three fault patches that steepen approaching the surface. This study emphasizes the fundamental role of shallow aseismic slip in the long-term and permanent deformation of thrusts and folds and the potential of Interferometric Synthetic Aperture Radar for detecting and characterizing the spatiotemporal behavior of aseismic slip over large mountainous regions.
机译：了解地震循环产生折叠和适应缩短的机制对于量化积极故障的地震潜力并在我们对长期变形的物理机制的理解中整合抗性滑动的必然。然而，由于相对于噪声幅度的幅度低，测量山区中的这种小变形信号具有当前的空间地理区域的挑战。在这里，我们成功对NE西藏的北柴达木折叠式系统进行了多型干涉综合孔径雷达分析，其中2003年至2009年之间发生了8mW> 5.2地震。我们报告了各种抗震滑度造成了在短波长的增厚外壳的疾病。我们提供了一个罕见的陡峭，浅薄，13公里长，6公里宽的余下信号的例子，其在空间上与斜线相一致，并在2003年的MW 6.3活动中继续到2011年。我们建议埋藏2003年地震期间的地震滑动引发了浅推力的塑料弹性折叠和抗空血障碍。我们由于2003年地震而产生一流的二维模型，由于2003年的地震，突出了三个故障分割的综合陡峭接近表面的补丁。本研究强调了浅埋抗性滑动在长期和永久变形的浅层和折叠的长期变形以及干涉性合成孔径雷达的潜力，用于检测和表征大山区的抗性滑动的时空行为。

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