Study on Crustal Structure in Haiyuan Strong Earthquake Region  

作　　者：Li Songlin,Zhang Xiankang,Zhang Chengke,Ren Qingfang,Shi Jinhu,Zhao Jinren,Fang Shengming,Liu Baofeng,Pan Suzhen, and Zhang Jianshi Research Center of Exploration Geophysics, CSB, Zhengzhou 450002 , China 

出　　处：《Earthquake Research in China》2001年第3期230-238,共9页中国地震研究（英文版）

基　　金：the State Key Project(95-13-02-02),China.Contribution No.200012,the Research Center of Exploration Geophysics,CSB.

摘　　要：The crust/upper-mantle velocity structure and deep tectonic features are obtained in Haiyuan M = 8. 5 earthquake region from data processing of Xiji-Zhongwei deep seismic sounding (DSS) profile. The result shows that there is a great difference between the velocity structures on the two sides of the epicenter. The crust consists of alternative high and low velocity layers on the southern side while on the northern side it consists of a series of layers with positive velocity gradient. There exists a deep fault cutting Moho or an anomalous deep structural zone in the epicentral region.The crust/upper-mantle velocity structure and deep tectonic features are obtained in Haiyuan M = 8. 5 earthquake region from data processing of Xiji-Zhongwei deep seismic sounding (DSS) profile. The result shows that there is a great difference between the velocity structures on the two sides of the epicenter. The crust consists of alternative high and low velocity layers on the southern side while on the northern side it consists of a series of layers with positive velocity gradient. There exists a deep fault cutting Moho or an anomalous deep structural zone in the epicentral region.

关 键 词：HAIYUAN EARTHQUAKE CRUSTAL structure Deep CRUSTAL FAULT ANOMALOUS structural zone. 

分 类 号：P315[天文地球—地震学]