Numerical Modeling Of Pre-and Co-seismic Deformation Of The Mani Ms7.9 Earthquake Revealed By Using D-InSAR Technology

This thesis presents a study of a great earthquake, which happened in the mainland of China at the end of 20th Century. Several theories and technologies are combined in order to do the research, including modern space geodetic techniques specially D-InSAR (Differential Interferometry Synthetic Aperture Radar), the computer numerical modeling method, the Finite Element Analysis (FEA) and the remote computing technology. First, the pre- and co-seismic deformation of Mani Ms7.9 Earthquake is acquired using D-InSAR technique. In order to gain some new knowledge about the medium mechanical parameters of the south and north walls of the Mani earthquake fault, the pre-seismic deformation field was simulated using FEA software. Based on Okada elastic half space dislocation theory, a tele-computing system is developed, which can simulate the co-seismic D-InSAR interferometry deformation field at any Internet terminator. As a study example of using this new system, this work tele-simulates the co-seismic deformation field of the Mani earthquake and attains part of the geometrical and kinematical parameters of this strong earthquake. On the basis of previous studies, this work gains some new conclusions described below.â‘ Using D-InSAR technology, the co-seismic deformation field of the Mani Ms7.9 earthquake is obtained.The Mani Ms 7.9 earthquake happened at the north border of the Qiangtan basin of Tibet, near the NEE trending Maergaichaka-Ruolacuo fault, on 8 November 1997. The region of Qiangtan, which means a place where nobody lives in the language of Tibetan, has cold weather and thin air. Because of its hard field conditions, there is no deformation observation station around several hundreds kilometers in circuit. All these realistic situations put limits on learning the surface deformation field of the earthquake region and deformation of active faults. Fortunately, D-InSAR technology is available which is not affected by all these factors and has preponderant advantages in acquiring information of spatial deformation field evolution.This work collected 16 wells ERS-1/2 Radar Satellite data of European Spatial Bureau from January 1995 to December 2000. Two ERS-1 SAR data are included: 2889/19960415, 2907 /19960415. And there are 14 ERS-2 SAR data: 2889/19960416, 2907/19960416, 2889/19970121, 2907/19970121, 2889/19970610, 2907/19970610, 2889/19970819, 2907/19970819, 2889/19971202, 2907/19971202, 2889/19980421, 2907/19980421, 2889/19990406 and 2907/19990406. These SAR data are handled using three-pass Differential Interferomertry mode.