Study on crustal deformation of the Ms6.6 Damxungearthquake in 2008 by InSAR measurements  

作　　者：Xuejun Qiao Shanjun Ren Zhaosheng Nie Yu Zhou Qiang Shen Shaomin Yang 

机构地区：[1]Institute of Seismology, China Earthquake Administration, Wuhan 430071, China

出　　处：《Geodesy and Geodynamics》2010年第1期15-22,共8页大地测量与地球动力学（英文版）

基　　金：supported by the National Natural Science Fundation of China(40774014,40674054,40575011,40674009)

摘　　要：Three Envisat images from ESA were used to derive the pre - and co-seismic deformation interfereograms caused by the Damxung Ms6. 6 earthquake of Oct. 6,2008 ,by using InSAR. The result shows no significant crustal motion more than 4 months before the earthquake, but a maximum co-seismic displacement of about 0.3 m in an epicentral area of 20 km × 20 km. The deformation field was symmetrically distributed about a NS axis, where the west side subsided and the east side uplifted. We used a linear elastic dislocation model in half space and a nonlinear constraint optimized algorithm to estimate the slip distribution along the fault. The results indicates that the epicenter is located at 90. 374°E ,29. 745°N with a moment magnitude of Mw6. 35. The earthquake is dominated by normal faulting with a maximum slip of 3 m on a 12 km × 11 km fault plane striking S189°W,dipping 60° to NW at a depth of 9.5 km,and is located at a sub-fault of the southeastern Piedmont of the Nyainqentanglha mountains. The relatively shallow depth of earthquake is related to relatively high heat flow in the area.Three Envisat images from ESA were used to derive the pre - and co-seismic deformation interfereograms caused by the Damxung Ms6. 6 earthquake of Oct. 6,2008 ,by using InSAR. The result shows no significant crustal motion more than 4 months before the earthquake, but a maximum co-seismic displacement of about 0.3 m in an epicentral area of 20 km × 20 km. The deformation field was symmetrically distributed about a NS axis, where the west side subsided and the east side uplifted. We used a linear elastic dislocation model in half space and a nonlinear constraint optimized algorithm to estimate the slip distribution along the fault. The results indicates that the epicenter is located at 90. 374°E ,29. 745°N with a moment magnitude of Mw6. 35. The earthquake is dominated by normal faulting with a maximum slip of 3 m on a 12 km × 11 km fault plane striking S189°W,dipping 60° to NW at a depth of 9.5 km,and is located at a sub-fault of the southeastern Piedmont of the Nyainqentanglha mountains. The relatively shallow depth of earthquake is related to relatively high heat flow in the area.

关 键 词：InSAR （synthetic aperture radar interferometry） co-seismic deformation Damxung Yadong-Gulu rift southeastern Piedmont of the Nyainqentanglha mountains 

分 类 号：P225.1[天文地球—大地测量学与测量工程] P315.7[天文地球—测绘科学与技术]