Crustal thickness and v_P/v_S ratio in Shanxi Graben, China  

作　　者：Yutao Shi Yuan Gao Honglin Jing 

机构地区：[1]Institute of Earthquake Science, China Earthquake Administration

出　　处：《Earthquake Science》2014年第6期589-597,共9页地震学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.41230210);the Projects of International Cooperation and Exchanges from the Ministry of Science and Technology of China(Grant No.2010DFB20190);the Fundamental Research Funds for the Institute of Earthquake Science,China Earthquake Administration

摘　　要：Shanxi Graben is in the middle part of the North China Craton, from south to north. With the teleseismic data recorded by Regional Seismograph Networks and the temporary ZBnet-W Seismic Array around east part of Shanxi Graben, we measured the crustal thickness and Vp/Vs ratio beneath each station using the H-K stack of receiver functions. The observed crustal thickness shows obvious lateral variation, increasing gradually from east to west in the Shanxi Graben. Beneath the Shanxi Graben the crust is relatively thicker than both sides of the south and the north. In addition, the Vp/Vs ratio in the north of study zone is higher than that in the south. The highest Vp/Vs ratio exists in the crust of the Xinding basin and the Datong basin. Our study also suggests that high velocity ratio might result from the strong activities of the magmation and volcanism.Shanxi Graben is in the middle part of the North China Craton, from south to north. With the teleseismic data recorded by Regional Seismograph Networks and the temporary ZBnet-W Seismic Array around east part of Shanxi Graben, we measured the crustal thickness and Vp/Vs ratio beneath each station using the H-K stack of receiver functions. The observed crustal thickness shows obvious lateral variation, increasing gradually from east to west in the Shanxi Graben. Beneath the Shanxi Graben the crust is relatively thicker than both sides of the south and the north. In addition, the Vp/Vs ratio in the north of study zone is higher than that in the south. The highest Vp/Vs ratio exists in the crust of the Xinding basin and the Datong basin. Our study also suggests that high velocity ratio might result from the strong activities of the magmation and volcanism.

关 键 词：Shanxi Graben North China Craton （NCC） Receiver function Crustal thickness - Crustal Vp/Vs ratio 

分 类 号：P315.2[天文地球—地震学]