COSEISMIC DISPLACEMENT AND FAULT SLIP OF THE MW6.1 NAPA EARTHQUAKE IN AMERICA REVEALED BY SENTINEL-1A INSAR DATA

doi:10.3969/j.issn.0253-4967.2016.02.004

Abstract

Abstract:

We achieved the coseismic displacements of the Napa M_W6.1 earthquake located in California US occurring on 24 August 2014 by using InSAR data from the newly launched ESA's Sentinel-1A satellite. The 30m×30m ASTER GDEM was used to remove the terrain effect, and phase unwrapping method of branch-cut algorithm was adopted. In order to obtain a better coseismic displacement field, we also tested 90m×90m SRTM data to remove the terrain effect and Minimum Cost Flow algorithm to unwrap the phase. Results showed that the earthquake caused a significant ground displacement with maximum uplift and subsidence of 0.1m and -0.09m in the satellite light of sight(LOS). Based on the Sentinel-1A dataset and sensitivity based iterative fitting(SBIF) method of restrictive least-squares algorithm, we obtained coseismic fault slip distribution and part of the earthquake source parameters. Inversion results show that the strike angle is 341.3°, the dip angle is 80°, rupture is given right-lateral fault, average rake angle is -176.38°, and the maximum slip is ~0.8m at a depth of 4.43km. The accumulative seismic moment is up to 1.6×10¹⁸N·m, equivalent to a magnitude of M_W6.14.

Key words: Sentinel-1A, Napa earthquake, D-InSAR, coseismic displacement, inversion

摘要：

利用欧洲空间局新发射的Sentinel-1A卫星获取的第1对同震SAR影像，采用30m×30m分辨率的ASTER GDEM数据去除地形效应，应用枝切法解缠，得到了2014年8月24日美国加利福尼亚州纳帕地震的地表同震形变场。为了获取最优同震形变场，对比使用了90m×90m分辨率的SRTM数据去除地形相位，以及最小费用流方法进行相位解缠。结果显示此次地震造成形变场在LOS方向（Line Of Sight）的最大抬升量和最大沉降量分别达到了0.1m和0.09m。基于获取的同震形变场，采用限制性最小二乘算法进行敏感性迭代拟合，获取了此次地震的断层滑动分布及部分震源参数。反演结果表明发震断层的走向为341.3°，倾角为80°，破裂以右旋走滑为主，平均滑动角为-176.38°，最大滑动量达0.8m，位于地表下约4.43km处。此次地震累计释放地震矩1.6×10¹⁸N·m，约合矩震级M_W6.14。

关键词: Sentinel-1A, 纳帕地震, D-InSAR, 同震形变, 反演

CLC Number:

P315.2

ZUO Rong-hu, QU Chun-yan, ZHANG Guo-hong, SHAN Xin-jian, SONG Xiao-gang, WEN Shao-yan, XU Xiao-bo. COSEISMIC DISPLACEMENT AND FAULT SLIP OF THE M_W6.1 NAPA EARTHQUAKE IN AMERICA REVEALED BY SENTINEL-1A INSAR DATA[J]. SEISMOLOGY AND GEOLOGY, 2016, 38(2): 278-289.

左荣虎, 屈春燕, 张国宏, 单新建, 宋小刚, 温少妍, 徐小波. 基于Sentinel-1A数据获取美国纳帕M_W6.1地震同震形变场及断层滑动反演[J]. 地震地质, 2016, 38(2): 278-289.

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