新疆于田Mw7.2地震3D同震形变场解算与分析  

CALCULATION AND ANALYSIS OF THREE-DIMENSIONAL CO-SEISMIC DEFORMATION FIELD CAUSED BY XINJIANG YUTIAN Mw7.2 EARTHQUAKE

作　　者：洪顺英[1] 单新建[2] 刘智荣[3] 申旭辉[1] 戴娅琼[1] 荆凤[1] 

机构地区：[1]中国地震局地震预测研究所,北京100036 [2]中国地震局地质研究所,地震动力学国家重点实验室,北京100029 [3]防灾科技学院,北京101601

出　　处：《大地测量与地球动力学》2013年第1期6-12,共7页Journal of Geodesy and Geodynamics

基　　金：防灾减灾青年科技基金(200908);中央高校基本科研业务费(ZY20120102);国家自然科学基金(41104030)

摘　　要：基于OKADA弹性半空间模型和差分干涉测量获取的升、降轨两种不同视角的同震形变场,分析了于田地震三维同震形变场特征。结果表明:在垂直方向上,断层西盘沉降,最大沉降形变量达-109.7 cm,东盘隆升,最大隆升形变量为19.2 cm;在东西方向上,断层西盘以朝西运动为主,最大形变量达-51.4 cm,东盘朝东运动,最大形变量达98.5 cm;在南北方向上,断裂西盘以朝南运动为主,最大形变量达-66.5 cm,断裂东盘朝北运动,最大形变量为25.8 cm;合成后的水平向形变表明,断层具有西盘朝南走滑、东盘朝北走滑的形变特征,揭示出于田地震断层为正断兼左旋走滑的破裂机制。On the basis of the elastic half-space model of OKADA, and under the constraint of interferograms, We obtained the parameters of three sub-faults and simulative three-dimensional（3D） deformation field of the Yu- tian MwT. 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 co-seismic 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 - 109.7 era, but the east wall uplifted with maximum value about 19.2 cm, and the dominant subsiding deforma- tion feature indicates the mostly normal rupture feature of the earthquake; in the east-west 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 north-south direction, the west wall majorly moved south wards with maximal value about - 66.5 cm, but the east wall majorly moved north wards with maximal value about 25.8 cm. The syn- thetic 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 strike-slip with the obvious normal.

关 键 词：于田Mw7 2地震 SAR差分干涉测量 视线向 三维形变 OKADA 

分 类 号：P315.725[天文地球—地震学]