龙门山褶皱逆冲带中前山逆冲带之新期构造及断层运动学
- 出版年：2010
- 作者：J.Bruce H.Shyu（徐澔德）；Ling-Ho Chung；Xi-wei Xu；Kuang-Yin Lai；Yue-Gau Chen
- 单位1：Department of Geosciences
- 语种：中文
- 起始页：32
- 总页数：2
- 刊名：国际地震动态
- 是否内版：否
- 刊频：月刊
- 创刊时间：1971
- 主管单位：中国科学技术协会
- 主办单位：中国地震学会；中国地震局地球物理研究所
- 主编：许绍燮
- 地址：北京市海淀区民族大学南路5号
- 邮编：100081
- 电子信箱：rdws@cea-igp.ac.cn
- 网址：http://www.gjdzdt.org.cn
- 期：6
- 期刊索取号：P263.06 627-3
- 数据库收录：中国核心期刊（遴选）数据库收录期刊；中国学术期刊综合评价数据库统计源期刊；中国期刊全文数据库（CJFD）全文收录期刊；中文科技期刊数据库原文收录期刊
- 核心期刊：中国核心期刊（遴选）数据库收录期刊
摘要
The disastrous Wenchuan, Sichuan, earthquake (Ms = 8. 0) on 12 May 2009ruptured several major thrust faults of the Longmenshan fold-and-thrust belt, along thewestern margin of the Sichuan Basin. This earthquake produced significant damages of thearea, with more than 60,000 of casualties and countless economic losses, and was one of thelargest natural disasters ever occurred in the Sichuan Province in history. The earthquakewas accompanied by several surface ruptures, including the central rupture (Beichuan fault) ,the frontal rupture ( Pengguan fault), and a shorter Xiaoyudong rupture between the centraland frontal ruptures.
The frontal rupture, which is part of the Pengguan fault, had predominantly thrust off-set. The total length of the frontal rupture is up to 90 km, with a maximum vertical offsetbetween 3 and 4 m. Although it is called the frontal rupture, the structure is not the frontalfault of the system. South of Hanwang Town, the Pengguan fault follows a mountain front-parallel valley, whereas the actual mountain front structure did not rupture during thisearthquake. Immediately north of Hanwang Town, on the other hand, the mountain frontapproximately follows the fault, but the rupture terminated not very far to the north. Uplif-ted alluvial surfaces, however, indicate that there is still a blind frontal thrust underneaththe western margin of the basin. Along the Jing River, widespread and continuous river ter-races provide the opportunity to characterize the late Quaternary slip rates of the faults. Fur-thermore, unique drainage patterns south of the Xiaoyudong rupture suggest that the areabehaves distinctively, and the Xiaoyudong rupture may be an independent fault with previousrupture events.
The frontal rupture, which is part of the Pengguan fault, had predominantly thrust off-set. The total length of the frontal rupture is up to 90 km, with a maximum vertical offsetbetween 3 and 4 m. Although it is called the frontal rupture, the structure is not the frontalfault of the system. South of Hanwang Town, the Pengguan fault follows a mountain front-parallel valley, whereas the actual mountain front structure did not rupture during thisearthquake. Immediately north of Hanwang Town, on the other hand, the mountain frontapproximately follows the fault, but the rupture terminated not very far to the north. Uplif-ted alluvial surfaces, however, indicate that there is still a blind frontal thrust underneaththe western margin of the basin. Along the Jing River, widespread and continuous river ter-races provide the opportunity to characterize the late Quaternary slip rates of the faults. Fur-thermore, unique drainage patterns south of the Xiaoyudong rupture suggest that the areabehaves distinctively, and the Xiaoyudong rupture may be an independent fault with previousrupture events.