利用D-InSAR技术研究西藏改则地震同震形变场  

OBSERVING COSEISMIC DEFORMATION OF THE GAIZE,XIZANG EARTHQUAKE WITH DIFFERENTIAL INTERFEROMETRIC SAR

作　　者：张桂芳[1] 单新建[1] 张国宏[1] 

机构地区：[1]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

出　　处：《地震地质》2009年第2期334-340,共7页Seismology and Geology

基　　金：中国地震局地质研究所基本科研业务专项(DF-IGCEA0607119);国家科技支撑计划项目(2006BAC01B030103,2008BAC35B04);国家自然科学基金(40574007)共同资助

摘　　要：针对2008年1月9日MW6.4西藏改则地震和2008年1月16日的MW5.9余震,通过两通(2-pass)加外部DEM差分干涉处理技术(D-InSAR),提取了地震区域2次地震累积的视线向(LOS)同震形变场。结果表明:发震断层均为正断层,位于依布茶卡-日干配错断裂端点附近。主震发震断层走向为N30°E,余震发震断层走向为N21°E,两断层距离约7km;在影像上主震发震断层有造成地表破裂的痕迹,余震未见地表破裂的痕迹;这次地震造成的同震形变场长约30km,宽约20km,主震断层上盘和下盘视线向最大形变量分别为39.2cm和11.2cm,两盘相对位错达50.4cm,余震造成的视线向形变量为9.4cm。There are two earthquakes in Gaize on Jan 9 （ Ms 6.9 ） and Jan 16,2008 （ Ms 6.0）. The two earthquakes were selected as examples to obtain the co-seismic deformation field with the 2-pass dif- ferential interferometric processing method. The results show that the earthquake faults locate near the tip of the Yibuchaka-Riganpeicuo Fault, and both seismic faults are normal faults; The seismogenic fault of the main shock strikes about N30°E and that of the aftershock strikes about N21°E; There is evidence of surface rupture along the mainshock＇s causative fault,but no surface rupture has been ob- served on the aftershock fault; The co-seismic deformation field is about 30km in length and 20km in width ; The maximum displacement in LOS of the hanging wall of the main-shock fault is 39.2cm, and that of footwall is 11.2cm,the relative dislocation between them is 50.4cm ; The displacement caused by the aftershoek is 9.4cm（LOS）.

关 键 词：差分干涉测量 改则地震 同震形变场 

分 类 号：P228[天文地球—大地测量学与测量工程]