基于InSAR分析2015年尼泊尔MW7.8地震形变场特征及断层滑动分布反演

doi:10.12196/j.issn.1000-3274.2020.04.006

Abstract

Abstract: The Nepal M_W7.8 earthquake occurred on April 25, 2015. Based on Sentinel-1A SAR images before and after the earthquake, the coseismic deformation field was derived by D-InSAR method. InSAR observation results show that the coseismic deformation field was located near the Main Boundary Thrust Fault (MBT) and the Main Frontal Thrust Fault (MFT) in the Himalayan Orogenic Belt. The whole deformation field showed a spindle-shaped envelope extending about 150 km in length from northwest to southeast. The coseismic deformation is dominated by uplift in large area. The maximum uplift in line-of-sight (LOS) is 1.18m. There was a small subsidence area to the north of the uplift area. The maximum coseismic deformation center is obtained from InSAR deformation. Based on the Okada model and InSAR observations, we inverted the fault slip distribution. Inversion results show that the earthquake is a typical thrusting event. The main seismogenic fault is Main Himalayan Thrust Fault (MHT). And coseismic rupture is transmitted upward from Main Himalayan Thrust Fault (MHT) along Main Frontal Thrust Fault (MFT). In this paper, based on the details of InSAR coseismic deformation field, combined with the geological background, fault distribution and fault movement characteristics of the earthquake area, the preliminary interpretation and description of the pseudo coseismic fracture surface trace is completed.

Key words: 2015 Nepal M_W7.8 earthquake, D-InSAR, Coseismic deformation field, Fault slip inversion

CLC Number:

P315.7

XU Xiao-bo, MA Chao, HONG Shun-ying, LIAN Da-jun, ZHANG Ying-feng. Analysis of Coseismic Displacements due to the M_W7.8 Nepal Earthquake Using InSAR Data and Inversion of Fault Slip Distribution[J]. EARTHQUAKE, 2020, 40(4): 76-89.

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Analysis of Coseismic Displacements due to the M_W7.8 Nepal Earthquake Using InSAR Data and Inversion of Fault Slip Distribution

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Analysis of Coseismic Displacements due to the MW7.8 Nepal Earthquake Using InSAR Data and Inversion of Fault Slip Distribution

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Analysis of Coseismic Displacements due to the M_W7.8 Nepal Earthquake Using InSAR Data and Inversion of Fault Slip Distribution