COSEISMIC SLIP DISTRIBUTION OF YUTIAN Mw7.1 EARTHQUAKE BASED ON STEEPEST DESCEND METHOD
Liu Zhirong 1) ;Huang Jingyi 1,2) ; Bai Xiangdong 1, 2) ; Hong Shunying 3) ; and Chen Yaofei 1)
1)Institute of Disaster Prevention Science and Technology, Beijing 101601;2)Institute of Engineering Mechanics, China Earthquake Adiministration, Harbin 150080;3)Institute of Earthquake Science，China Earthquake Adiministration, Beijing 100036
Abstract：Using InSAR technology and the ENVISAT ASAR data, this paper obtains the coseismic deformation fields of Yutian \%M\%w\{7.1\} earthquake happened on March 21, 2008.This paper inverts the coseismic slip distribution of Yutian earthquake with the Steepest Descent Method (SDM). The results are shown as follows.The inversion residual errors of the ascending and descending orbit surface deformation field are effectively controlled to small value; the major slip distribution is concentratedly located from 0 to 14 km depth along the fault plane; The largest slip value is about 5.47 m which is located in depth of 2.05 km along the fault plane of F2; the northern section of F1 is the obliqueslip rupture nearly equal to left lateral strikeslip and dipslip, while the middle section of F2 and southern section of F3N/F3S are basically the dipslip rupture with a little of left lateral strikeslip; The slip is mainly concentrated in the middle and southern section, and the slip of the northern section is small, the total seismic moment M0 from inversion is about 5.16×10 19 Nm, equivalent to moment magnitude Mw7.07.
Liu Zhirong ,Huang Jingyi,Bai Xiangdong et al. COSEISMIC SLIP DISTRIBUTION OF YUTIAN Mw7.1 EARTHQUAKE BASED ON STEEPEST DESCEND METHOD[J]. jgg, 2012, 32(6): 8-12.
