Focal depth estimates of earthquakes in the Himalayan-Tibetan region from teleseismic waveform modeling

作     者：Ling Bai Jeroen Ritsema Junmeng Zhao 

作者机构：Key Laboratory of Continental Collision and Plateau UpliftInstitute of Tibetan Plateau ResearchChinese Academy of Sciences Department of Earth and Environmental SciencesUniversity of Michigan 

出 版 物：《Earthquake Science》 (地震学报（英文版）)

年 卷 期：2012年第25卷第5期

页      面：459-468页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 07[理学] 070801[理学-固体地球物理学] 0707[理学-海洋科学] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 0816[工学-测绘科学与技术] 0813[工学-建筑学] 0814[工学-土木工程] 0825[工学-航空宇航科学与技术] 0704[理学-天文学] 

基　　金：funded by the grants of 100-talent program of Chinese Academy of Sciencesto L. Bai the US National Science Foundation (EAR-0944167) to J. Ritsema the National Natural Science Foundation of China (40930317) to J. Zhao 

主　　题：continental collision zone Tibetan plateau focal depth strength of the continental lithosphere 

摘      要：We estimate the focal depths and fault plane solutions of 46 moderate earthquakes in the Himalayan- Tibetan region by modeling the broadband waveforms of teleseismic P waves. The depths of 38 of these earth- quakes range between 0-40 km, with a peak at -5 km. One earthquake is located within the lower crust of the Indian shield. The remaining eight earthquakes occurred between depths of 80 -120 km and are all located in the Pamir-Hindu Kush and the Indo-Myanmar deep seismic zones. None of the earthquakes outside these deep seismic zones are located in the mantle. Global centroid moment tensor （CMT） solutions indicate that most earthquakes in northern Tibet and northern India had thrust-faulting mechanisms and that normal and strike-slip faulting earthquakes occurred primarily in central Tibet. These mechanisms are consistent with the predominantly NNW-SSE compression in the direction of current Himalayan-Tibetan continental collision.