Receiver function structures beneath the Haiyuan fault on the northeastern margin of the Tibetan plateau

作     者：Yutao Shi Yuan Gao Laiyu Lu Yutao Shi;Yuan Gao;Laiyu Lu

作者机构：Institute of Earthquake ForecastingChina Earthquake AdministrationBeijing 100036China Institute of GeophysicsChina Earthquake AdministrationBeijing 100081China 

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

年 卷 期：2021年第34卷第4期

页      面：367-377页

学科分类：070904[理学-构造地质学] 070801[理学-固体地球物理学] 0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 

基　　金：supported by National Natural Science foundation of China(Nos.41474032 and U1839209) the Basic Research Project of the Institute of Earthquake Forecasting,China Earthquake Administration(Nos.2019CSES0102 and 2012IES010101) 

主　　题：Haiyuan fault Receiver function Crustal thickness vP/vS ratio 

摘      要：We performed a receiver function analysis on teleseismic data recorded along two dense seismic profiles and from 4 broadband regional seismic stations across the northeastern Tibetan *** crustal thickness and vP/vS ratio were measured by the H-κdomain search *** Moho discontinuity across the Haiyuan arc fault zone was also revealed by common conversion point(CCP)*** study results show that the crustal thickness and the vP/vS ratio were 42–56 km and 1.60–1.88,*** crustal thickening on the northeastern margin indicates that the crust is shortening or that there was a superimposition of crusts during the collision of the Tibetan plateau with Eurasian *** results suggest that Haiyuan fault likely resulted from the interactions of high temperature and pressure conditions during the collision of the Indian and Asian *** Moho beneath the Haiyuan tectonic region exhibits an obvious offset and a vague discontinuity according to CCP *** study suggests that the Haiyuan arc fault zone is a trans-crustal fault that cuts through the Moho in the northeastern Tibetan ***,there are indications of strong deformation in the intensive crustal extrusion from the interior of the Tibetan Plateau to its northeastern margin.