土工基础

›› 2011, Vol. 25 ›› Issue (1): 78-.

• 工程实录 • 上一篇    

四川汶川地震灾情特重的地质解释

 谭周地1, 薄景山2   

  1. （1.吉林大学建设工程学院，长春 130026; 2.国家地震局防灾科技学院  ,北京东燕郊 101601）
  • 收稿日期:2010-10-11 出版日期:2011-02-20 发布日期:2014-06-27
  • 作者简介:谭周地，教授。

Geology Analysis for Seismic Disaster in Wenchuan

TAN  Zhou  di1, BO  Jing  shan2   

  1. (1. Construction Engineering College, Jilin University, Changchun Jilin  130026; 
    2. Institute of Disaster Prevention Science and Technology, State Seismological Bureau, Dongyanjiao Beijng  101601, China)
  • Received:2010-10-11 Online:2011-02-20 Published:2014-06-27

摘要： 08.5.12四川汶川大地震是新中国成立以来的灾情最重震域最广的一次地震。高烈度区面积比同级地震要广阔得多，究其原因除山高谷深、有易滑地层等因素外，龙门山断裂（发震构造）的地质特性可能更具有决定性意义。龙门山断裂的地质环境是：它位于我国东西两大构造区的分界巨型南北向构造上,其走向已变为NE~SW，它也是青藏活动亚板块的东面边界的北段。青藏亚板块的周边（三面边界）均以断裂为界，其北面、西南面及东面南段的断裂边界明显，唯独东面北段边界十分不明显。龙门山断裂带是由多条从山前往山里分布的NE、NNE向断裂组成的弥漫性边界,发震不限于一处而是多处破裂发震。因此，这是一个典型的多元地震。

关键词: 汶川特大地震, 龙门山断裂, 弥漫性边界, 多元地震

Abstract: Wenchuan earthquake was the most serious disaster and the widest seismic area since the P. R. China was founded and had the wider area of high seismic region, which was resulted from the location of canyon area and sliding\|prone stratum, particularly the geological characteristic of Longmenshan fault. It was the giant north\|south structure with NE~SW trend, which located on the boundary of two large structures and was north part of east boundary of Qinghai\|Tibet plate, in which there were the fracture zones as the boundary except the east boundary. Longmenshan fault was composed of many fractures, which had the NE and NNE trends. Because of these fractures, its seismic type was the multi fracture seismic, therefore, it was the typical multivariate seismic.