Distinguish the Co-Seismic Fault of the M_s8.0 Wenchuan Earthquake from the Pengguan Thrust Belt and Analyse Its Shallow Structures in the Central Longmen Mountains

详细信息   

• 责任者：Lu Renqi (College of Energy Resources ; China University of Geosciences ; Beijing 100083 ; China) ; He Dengfa
• 刊名：Chinese Journal of Geology
• 出版年：2011
• 卷期：46(3)
• 关键词：汶川地震2008 ; Wenchuan earthquake 2008 ; 破裂 ; rupture ; 断层 ; faults ; 龙门山断裂带 ; Longmenshan Fault Zone
• 页码：p.607-619
• 图表：7 illus., 34 refs.
• 分类号：0300
• issnNo：ISSN0563-5020
• isbnNo：CN11-1937/P

摘要

The Ms 8.0 Wenchuan, China, earthquake ruptured two large thrust faults along the Longmen Mountains thrust belt. In this paper, in order to distinguish the co-seismic fault in Pengguan thrust belt, the fine interpretation of seismic profiles in the central Longmen Mountains have been accomplished by take advantage of geology map, drilling data and 2D/3D seismic reflection profiles, the studies found that the Pengguan thrust belt have three main faults and another branch faults. The main faults are developing imbricated structure in the shallow strata and among them are developing the duplex. According to characteristics of geology, the main fault and the co-seismic surface ruptures, the front of central Longmen Mountains can be divided into two sub-segments, one is the Bailu area and the other is Hanwang area. The characteristics of shallow structures in the Pengguan thrust belt could provide some details and restriction for the research of faults in the front central Longmen Mountains.