Study on the Crustal Structure beneath Seismic Station Bachu and Taxkorgan in Xinjiang

作     者：Tang Mingshuai Wang Haitao Luo Ju Kong Xiangyan Yang Feng 

作者机构：Earthquake Administration of Xinjiang Uygur Autonomous Region 

出 版 物：《Earthquake Research in China》 (中国地震研究（英文版）)

年 卷 期：2015年第29卷第2期

页      面：265-274页

核心收录：

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 

基　　金：sponsored by the Seismic Networks Young Junior Training Project(20130216) the Earthquake Science and Technology Spark Program from China Earthquake Administration(XH15046) 

主　　题：Crustal thickness Poisson ratio Receiver function Brittle ductile transitionzone Xinjiang 

摘      要：Using the teleseismic waveform data recorded by the seismic station Bachu （hereafter referred to as station BCH ） in the Tarim Basin and the seismic station Taxkorgan （hereafter referred to as station TAG ） in the west Kunlun Mountains for years, we applied the receiver function H - K stacking method to study the crustal structure beneath stations BCH and TAG. The results showed that there are obvious differences in the crustal thickness beneath stations BCH and TAG, and the regional crustal thickness and terrain have a very good corresponding relationship. There are high crustal average Vp/Vs values beneath the two stations. The crustal thickness is 44km, and the crustal average wave velocity ratio is 1. 849 beneath station BCH. There is a sharp discontinuity in the middle of the crust beneath station BCH at a depth of 21km. There is a low average P wave velocity and low Vp/Vs from the surface to the discontinuity beneath station BCH. The depth of the discontinuity is consistent with the lower interface of the focal depth from accurate location in the Jiashi earthquake source area adjacent to station BCH; and may be the crustal brittle-ductile conversion boundary. The crustal thickness is 69km, and the crustal average wave velocity ratio is 1. 847 beneath station TAG, a thicker crust and high Vp/Vs may indicate that materials in the lower crustal are prone to plastic flow, which is responsible for the thickening of the crust.