地质科学Issue(3)：607-619,13.
龙门山中段彭灌断裂带汶川Ms8.0地震同震破裂断层识别及其浅、表构造特征
Distinguish the co-seismic fault of the Ms8.0 Wenchuan earthquake from the Pengguan thrust belt and analyse its shallow structures in the central Longmen Mountains
摘要
Abstract
The Ms 8. 0 Wenchuan, China, earthquake ruptured two large thrust faults along the Longmen Mountains thrust belt. Between them, the co-seismic fault in Pengguan thrust belt created the second longest surface ruptures. 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, Our 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. The co-seismic fault which made the surface ruptures in the Pengguan thrust belt is the ③ fault, that is also the largest fault in the front of central Longmen Mountains. These faults are formed with flat and ramp and they are steep at the surface but the angle dip decreased with the depth increasing. Our studies indicated that these fault were generating in the Late Triassic period, developing in the Late Jurassic period and keeping on activity in the Cenozoic period. 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.关键词
地震解释/轴面分析/地表破裂/同震破裂断层/彭灌断裂带/龙门山中段Key words
Seismic interpretation/ Axial analysing/ Surface ruptures/ Co-seismic fault/Pengguan thrust belt/Central Longmen Mountains分类
天文与地球科学引用本文复制引用
鲁人齐,何登发,JohnSuppe,孟征,高金尉,贺鸿冰..龙门山中段彭灌断裂带汶川Ms8.0地震同震破裂断层识别及其浅、表构造特征[J].地质科学,2011,(3):607-619,13.基金项目
国家重点基础研究发展计划项目(编号:2006CB202300)和国家自然科学基金重点项目(编号:40739906)资助. （编号:2006CB202300）
