The 2008 Nura Mw6.7 earthquake: A shallow rupture on the Main Pamir Thrust revealed by GPS and In SAR  

作　　者：Qiao Xuejun Wang Qi Yang Shaomin Li Jie Zou Rong Ding Kaihua 

机构地区：[1]Key Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration [2]Institute of Geophysics and Geomatics, China University of Geosciences [3]Planetary Science Institute, China University of Geosciences [4]Earthquake Administration of the Xinjiang Uygur Autonomous Region

出　　处：《Geodesy and Geodynamics》2015年第2期91-100,共10页大地测量与地球动力学（英文版）

基　　金：The study is funded by the National Natural Science Foundation of China(41274027,41274037,41374030 and 41474097)

摘　　要：The 2008 Nura Mw6.7 earthquake occurred in front of the Trans-Alai Range, central Asia. We present Interferometric Synthetic Aperture Radar （InSAR） measurements of its coseismic ground deformation that are available for a major earthquake in the region. Analysis of the InSAR data shows that the earthquake ruptured a secondary fault of the Main Pamir Thrust for about 20 kin. The fault plane striking N46~E and dipping 48~SE is dominated by thrust slip up to 3 m, most of which is confined to the uppermost 2-5 km of the crust, similar to the nearby 1974 MwT.0 Markansu earthquake. The elastic model of interseismic deformation constrained by GPS measurements suggests that the two earthquakes may have resulted from the failures of two high-angle reverse faults that are about 10 km apart and rooted in a locked dScollement at depths of 5-6 kin. The elastic strain is built up by a freely creeping decollement at about 16 mm/a.The 2008 Nura Mw6.7 earthquake occurred in front of the Trans-Alai Range, central Asia. We present Interferometric Synthetic Aperture Radar （InSAR） measurements of its coseismic ground deformation that are available for a major earthquake in the region. Analysis of the InSAR data shows that the earthquake ruptured a secondary fault of the Main Pamir Thrust for about 20 kin. The fault plane striking N46~E and dipping 48~SE is dominated by thrust slip up to 3 m, most of which is confined to the uppermost 2-5 km of the crust, similar to the nearby 1974 MwT.0 Markansu earthquake. The elastic model of interseismic deformation constrained by GPS measurements suggests that the two earthquakes may have resulted from the failures of two high-angle reverse faults that are about 10 km apart and rooted in a locked dScollement at depths of 5-6 kin. The elastic strain is built up by a freely creeping decollement at about 16 mm/a.

关 键 词：Shallow rupture Nura earthquake Main Pamir Thrust Global positioning system （GPS） Interferometric synthetic apertureradar （InSAR） Coseismic deformation Interseismic deformation Southern Tianshan 

分 类 号：P315.7[天文地球—地震学] TN958[天文地球—固体地球物理学]