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Sensors (Basel). 2016 Feb 5;16(2):206. doi: 10.3390/s16020206.

Post-Seismic Deformation from the 2009 Mw 6.3 Dachaidan Earthquake in the Northern Qaidam Basin Detected by Small Baseline Subset InSAR Technique.

Liu Y1,2,3, Xu C4,5,6, Wen Y7,8,9, Li Z10.

Author information

1
School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China. Yang.Liu@sgg.whu.edu.cn.
2
Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China. Yang.Liu@sgg.whu.edu.cn.
3
Collaborative Innovation Center for Geospatial Technology, Wuhan 430079, China. Yang.Liu@sgg.whu.edu.cn.
4
School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China. cjxu@sgg.whu.edu.cn.
5
Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China. cjxu@sgg.whu.edu.cn.
6
Collaborative Innovation Center for Geospatial Technology, Wuhan 430079, China. cjxu@sgg.whu.edu.cn.
7
School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China. ymwen@sgg.whu.edu.cn.
8
Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China. ymwen@sgg.whu.edu.cn.
9
Collaborative Innovation Center for Geospatial Technology, Wuhan 430079, China. ymwen@sgg.whu.edu.cn.
10
Department of Geodesy, National Geomatics Center of China, Beijing 100048, China. zcli@nsdi.gov.cn.

Abstract

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.

KEYWORDS:

InSAR; post-seismic deformation; small baseline subset technique; the 2009 Mw 6.3 Dachaidan earthquake; the Qaidam basin

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