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《Chinese Journal of Geophysics》 2018-01
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Coseismic displacements of the 2017 Jiuzhaigou M7.0 earthquake observed by GNSS:Preliminary results

WANG YueBing;GAN WeiJun;CHEN WeiTao;YOU XinZhao;LIAN WeiPing;State Key Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration;National Earthquake Infrastructure Service;  
On 8 August 2017 an earthquake of magnitude 7.0 struck Jiuzhaigou,Sichuan Province.Coseismic displacements of this event have been captured by both the GNSS continuous stations of the Tectonic and Environmental Observation Network of Mainland China and the Ground Reinforcement System(coordinates:east is positive,north is positive).The results show that of three sites of the above observation have recorded obvious coseismic horizontal displacements.Of them,the SCJZ site 43 km to the epicenter observed a displacement of-9.8±1.5 mm in the east-west direction and 3.3±0.7 mm in the north-south direction,respectively.The SCSP site 65 km to the epicenter measured displacement of-1.8±0.7 mm in the east-west direction and-7.7±0.6 mm in the north-south direction,respectively.At GSZQ site,77 km tothe epicenter,displacements of 0.4±1.2 mm in the east-west direction and 3.6±0.8 mm in the north-south direction were detected.The distribution of these coseismic displacements suggests that the earthquake is a sinistral strike-slip event,causing the horizontal deformation within an extent less than 150 km with a very small effect on the Longmenshan fault zone in the southeast.The displacements on the Tazang fault and the Minjiang fault reach several centimeters.The results of inversion of the coseismic displacements show that the slip on the fault plane is mainly concentrated around 7 km depth,with maximum about 0.4 mand an average slip angle-15°.The corresponding moment magnitude calculated by the slip distribution is about MW6.4,which is equivalent to that from seismic wave inversion.Based on the characteristics of coseismic slip distribution,principal strain distribution,aftershock distribution and focal mechanism solutions,it is inferred that the energy accumulated in the extreme area of the earthquake rupture is fully released,causing a significant stress change on the Tazang fault,the Minjiang fault and the Huya fault,which should receive continual attention.
【Fund】: 科技基础性工作专项(2015FY210400);; 地震科技星火计划(XH16049Y);; 中国地震局地震行业科研专项(201508003);; 国家重点研究发展计划(2016YFB0501900)资助
【CateGory Index】: P315.7
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