CALCULATION AND ANALYSIS OF THREEDIMENSIONALCO-SEISMIC DEFORMATION FIELD CAUSED BY XINJIANGYUTIAN Mw7.2 EARTHQUAKE
Hong Shunying1); Shan Xinjian2);Liu Zhirong3);Shen Xuhui1); Dai Yaqiong1); and Jing Feng 1)
1）Institute of Earthquake Science, China Earthquake Administration, Beijing 100036;2）Institute of Geology, China Earthquake Administration, Beijing 100029;3）Institute of Disaster Prevention Science And Technology, Beijing 101601
Abstract：On the basis of the elastic halfspace model of OKADA, and under the constraint of interferograms, We obtained the parameters of three subfaults and simulative threedimensional(3D) deformation field of the Yutian Mw7.2 earthquake, Xinjiang. Furthermore, combining the simulative North direction deformation field with the interferograms of ascending and descending oribt, we calculated out the deformation fields in vertical and east direction.At last, we analyzed the characteristics of 3D coseismic deformation field of the Yutian earthquake. The analysis shows that in the vertical direction, the west wall of the fault subside with maximal value about -1097 cm, but the east wall uplifted with maximum value about 19.2 cm, and the dominant subsiding deformation feature indicates the mostly normal rupture feature of the earthquake; in the eastwest direction, the west wall majorly moved west wards with maximal value about -51.4 cm, but the east wall majorly moved east wards with maximal value about 98.5 cm; in the northsouth direction, the west wall majorly moved south wards with maximal value about -665 cm, but the east wall majorly moved north wards with maximal value about 25.8 cm. The synthetic horizontal deformation field indicates that the west wall of the fault striked slip south wards, but east wall north wards.These characteristics reveal that the fault of Yutian Mw6.2 earthquake appeared with some sinistral strikeslip with the obvious normal.
Hong Shunying,Shan Xinjian,Liu Zhirong et al. CALCULATION AND ANALYSIS OF THREEDIMENSIONALCO-SEISMIC DEFORMATION FIELD CAUSED BY XINJIANGYUTIAN Mw7.2 EARTHQUAKE[J]. jgg, 2013, 33(1): 6-12.
