Post-Seismic Deformation from the 2009 Mw 6.3 Dachaidan Earthquake in the Northern Qaidam Basin Detected by Small Baseline Subset InSAR Technique.
Post-Seismic Deformation from the 2009 Mw 6.3 Dachaidan Earthquake in the Northern Qaidam Basin Detected by Small Baseline Subset InSAR Technique.
复制标题
小基线子集InSAR技术检测2009年柴达木盆地北部大柴旦6.3级地震震后形变
DOI：
10.3390/s16020206
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发表时间：
2016-02-05
期刊：
影响因子：
--
通讯作者：
Li Z
中科院分区：
文献类型：
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作者：
Liu Y;Xu C;Wen Y;Li Z
2009年8月28日，柴达木盆地北部中国发生6.3级逆冲断层地震。由于这一偏远地区缺乏地面观测，本研究提出了采用小基线子集InSAR技术的高精度、高时空分辨率的震后形变序列。在时间尺度上，随时间由快变慢，震后334天，沿视线最大抬升7.4厘米。在空间尺度上，上盘比下盘更明显，上盘从中间到两侧逐渐减小。然后，我们提出了一种通过归一化来计算同震变形和震后变形之间的相关系数的方法。相关系数为0.73，表明这两个阶段都发生了相似的地下过程。结果表明，在震后19-334天内，余滑可能主导震后形变，主要发生在断层几何形状和深度与c-地震破裂相似的情况下，部分延伸到更浅和更深的部位。
On 28 August 2009, one thrust-faulting Mw 6.3 earthquake struck the northern Qaidam basin, China. Due to the lack of ground observations in this remote region, this study presents high-precision and high spatio-temporal resolution post-seismic deformation series with a small baseline subset InSAR technique. At the temporal scale, this changes from fast to slow with time, with a maximum uplift up to 7.4 cm along the line of sight 334 days after the event. At the spatial scale, this is more obvious at the hanging wall than that at the footwall, and decreases from the middle to both sides at the hanging wall. We then propose a method to calculate the correlation coefficient between co-seismic and post-seismic deformation by normalizing them. The correlation coefficient is found to be 0.73, indicating a similar subsurface process occurring during both phases. The results indicate that afterslip may dominate the post-seismic deformation during 19–334 days after the event, which mainly occurs with the fault geometry and depth similar to those of the c-seismic rupturing, and partly extends to the shallower and deeper depths.