Crustal structure beneath Tien Shan orogenic belt and its adjacent regions from multi-scale seismic data

查看全文 作　　者：N.Ghani [1,2]KHAN;BAI [1]Ling;ZHAO [1]JunMeng;LI [1]GuoHui;M.Moklesur [1]RAHMAN;CHENG [1]Cheng;YANG [1]JianYa

机构地区：[1]Key Laboratory of Continental Collision and Plateau Uplift,Institute of Tibetan Plateau Research,Chinese Academy of Sciences;[2]Department of Earth Sciences,COMSATS Institute of Information Technology (CIIT)

出　　处：《Science China Earth Sciences》索引2017年第60卷第10期,共14页

基　　金：supported by the National Natural Science Foundation of China(Grant No.41490611)to Bai L and Zhao J M;the China academy of Sciences(Grant No.XDB03010702)to Zhao J M;the TWAS(The world Academy of Sciences)through CAS-TWAS president fellowship to Khan N G 摘　　要：As one of the world's most active intracontinental mountain belts, Tien Shan has posed questions for researchers regarding the formation of different tectonic units and active shallow seismicity. Here, we used a huge data set comprising of 7094 earthquakes from local, regional and teleseismic seismic stations. We used waveform modeling and multi-scale double-difference earthquake relocation technique to better constrain the source parameters of the earthquakes. The new set of events provided us with better initial earthquake locations for further tomographic investigation. We found that reverse-faulting earthquakes dominate the whole study area while the fault plane solutions for earthquakes beneath the northwestern Tarim Basin and the Main Pamir Thrust are diverse. There is a low-velocity anomaly beneath Bashkaingdy at depth of 80 km, and high-velocity anomalies beneath central Tien Shan at shallower depths. These observations are the keys to understand the mechanism of Tien Shan's formation because of Tarim Basin northward and Kazakh Shield's southward subduction in the south and north respectively. Velocities beneath western Tien Shan are relatively high. We thus infer that the Western Tien Shan is relatively less deformed than the eastern Tien Shan primarily due to a relatively brittle mantle. 关键词：地震资料多尺度地壳结构塔里木盆地北部邻区 C带速度异常陆内造山带

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Crustal structure beneath Tien Shan orogenic belt and its adjacent regions from multi-scale seismic data

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