Source model of 2016 Mw6.6 Aketao earthquake, Xinjiang derived from Sentinel-1 InSAR observation

被引:5
|
作者
Ma, Yun [1 ,2 ]
Qiao, Xuejun [1 ,2 ]
Chen, Wei [1 ,2 ]
Zhou, Yiyan [1 ]
机构
[1] China Earthquake Adm, Inst Seismol, Wuhan 430071, Hubei, Peoples R China
[2] China Earthquake Adm, Key Lab Seism Geodesy, Wuhan 430071, Hubei, Peoples R China
基金
美国国家科学基金会;
关键词
Aketao earthquake; Differential interferometry; Coseismic deformation; Focal mechanism inversion;
D O I
10.1016/j.geog.2018.05.001
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
On 25 November 2016 (14:24:30 UTC), an Mw6.6 earthquake occurred in Aketao county of Xinjiang. We derived the coseismic deformation field of the earthquake from ESA's Sentinel-1B images and inverted the fault geometry and slip distribution by using a homogenous half-space elastic model and the Steepest Decent Method (SDM) program. The slip model shows that the rupture plane is about 68 km in length and 40 km in width and has an average strike of 105.2 degrees SE and an average dip of 76.0 degrees S. The average amount of slip is similar to 0.16 m and the maximum amount of slip is 0.59 m. The estimated seismic moment is 1.31 x 10(19 )N.m and the corresponding moment magnitude is Mw6.68. The dislocation is mainly distributed in the depth of 5-22 km, where the rupture center is located at 39.17 degrees E, 74.38 degrees N, and a depth of similar to 8.8 km, so this earthquake is a shallow earthquake. In terms of the tectonic settings, the earthquake was triggered by the release of residual stresses on the seismogenic Muji fault. The ruptures were stimulated simultaneously by the main shock, which made the slip distribution pattern of a strike-slip fault with a double fracture. Due to the tectonic setting and the seismic gap between the ruptures, the Muji fault would have a risk of rupture to some extent and trigger an earthquake in future. (C) 2018 Institute of Seismology, China Earthquake Administration, etc. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.
引用
收藏
页码:372 / 377
页数:6
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