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

Abstract

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

CLC Number:

P315.7

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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Co-seismic Deformation Field and Fault Parameter Inversion of the 2016 Menyuan M_W5.9 Earthquake from Sentinel-1A Data

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Co-seismic Deformation Field and Fault Parameter Inversion of the 2016 Menyuan MW5.9 Earthquake from Sentinel-1A Data

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Co-seismic Deformation Field and Fault Parameter Inversion of the 2016 Menyuan M_W5.9 Earthquake from Sentinel-1A Data