Abstract:A MS6.4 earthquake struck Ning’er county of Pu’er city in Yunnan, China on June 3, 2007. In this paper, we extract the coseismic deformation field by two-pass differential interferometric SAR(D-InSAR) technology from ALOS PALSAR data. Based on the Okada half-space elastic model, the fault geometry of such earthquake and the corresponding fault slip distribution parameters are then calculated, as well as the changes of Coulomb stress around the fault after the earthquake. The results show that the maximum deformation occurred in the west wall of the fault, with a 51.6 cm deformation in the line-of-sight direction. And the epicenter of the inversion is located in 23.05°N, 101.02°E, of which the focal depth is 3 km, the strike is 145°, the dip is 49.5° and the rake is 153°. We infer that the NNW direction of Pu’er fault is a causative fault, where the main motion characteristics are right-lateral strike-slip, with thrusting component, of which the maximum value of slippage is 1.2 m, and the inversion magnitude is MW6.19. According to the Coulomb stress field, we find that the Mohei fault is located in the area of increasing Coulomb stress, while Jinggu earthquake is located in the area of negative Coulomb stress. In addition, considering both the field investigation data and experimental results, as a shallow earthquake, there is no rupture zone on the surface of Ning’er earthquake.
CHEN Chenyue,FENG Guangcai,GAO Hua et al. Earthquake Source Parameter of the Ning’er MS6.4 Earthquake Inferred fromInSAR Data and Analysis of Coulomb Stress Disturbance[J]. jgg, 2019, 39(3): 295-301.