利用Sentinel-1A数据反演2016年青海门源MW5.9地震的同震形变场及断层参数

摘要/Abstract

摘要： 利用Sentinel-1A卫星IW模式的升、降轨雷达复数影像, 结合ESA提供的精密轨道数据进行干涉处理, 根据30 m格网间距ASTER GDEM V2数据去除地形相位获得升轨和降轨差分干涉图, 采用带有掩膜的最小费用流算法解缠差分干涉图来反演2016年1月21日发生在青海门源M_W5.9地震的降轨同震形变场, 并基于弹性半空间矩形位错模型反演该地震的断层滑动分布。结果表明: 地震造成的同震形变场长约30 km, 宽约14 km, 震中呈现抬升, 为形变极大值区, 升轨雷达视线向最大形变量约为5 cm, 降轨雷达视线向最大形变量约为7 cm; 该地震断层滑动为左旋走滑, 为走向133.6°、倾角46.7°的东北倾断层, 主要滑动量集中在1~7 km深度, 最大滑动量约2.4 m, 位于4 km的深度; 反演得出的地震矩为1.19×10¹⁸ Nm, 震级为M_W6.0。

关键词: 同震形变, Sentinel-1A, InSAR, 断层滑动分布, 2016年青海门源地震

Abstract: Based on ascending and descending tracks of the Sentinel-1A satellite IW model, combined with the precision orbit data provided by ESA, the differential interferogram is obtained by removing the terrain phase from the ASTEM GDEM V2 data with 30 m grid spacing. The differential interferogram is unwrapped by minimum cost flow algorithm in order to derive the precise coseismic surface displacements of the Menyuan M_W5.9 earthquake occurred on January 21, 2016. Then elastic half-space dislocation model are used to estimate the fault geometry. The results show that the deformation field is about 30 km long and 14 km wide. The maximum LOS uplifting value is about 5 cm in the ascending coseismic deformation field and about 7 cm in the descending coseismic deformation field.The earthquake fault is a normal fault with a strike of 133.6°, a dip of 46.7° and dipping to northeast.The slip mainly occurs within 1~7 km along the orientation, with a maximum slip of 2.4 m at the depth of 4 km. The determined geodetic moment is 1.19×10¹⁸ Nm.

Key words: Co-seismic deformation, Fault slip distribution Sentinel-1A, InSAR, The 2016 Menyuan M_W5.9 earthquake

中图分类号:

P315.7

白泽朝, 徐青, 靳国旺, 张红敏, 刘辉, 董彦芳. 利用Sentinel-1A数据反演2016年青海门源M_W5.9地震的同震形变场及断层参数[J]. 地震, 2017, 37(3): 12-21.

BAI Ze-chao,XU Qing,JIN Guo-wang,ZHANG Hong-min,LIU Hui,DONG Yan-fang. Co-seismic Deformation Field and Fault Parameter Inversion of the 2016 Menyuan M_W5.9 Earthquake from Sentinel-1A Data[J]. EARTHQUAKE, 2017, 37(3): 12-21.

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