安宁河断裂带晚第四纪活动的基本特征及强震危险性分析  

Basic Characteristics and Earthquake Risk Analysis of the Anning River Fault Zone in the West of Sichuan Province

作　　者：程建武[1,2] 郭桂红[3] 岳志军 

机构地区：[1]甘肃省地震局,兰州730000 [2]中国地震局地质研究所,北京100029 [3]兰州大学西部灾害与环境力学教育部重点实验室,兰州730000 [4]四川省成都市川庆钻探国际工程公司土库曼分公司,成都610051

出　　处：《地震研究》2010年第3期265-272,共8页Journal of Seismological Research

基　　金：国家重点基础研究发展计划(2004CB418401);国家自然科学基金(40904010)联合资助

摘　　要：通过影像解译,结合野外地质调查,利用第四纪地貌填图、样品采集和差分GPS地貌面的测量等研究手段,对安宁河断裂带及其附近地区第四纪地貌特征与断层活动关系进行了研究,分析了安宁河断裂带晚第四纪以来的活动特征,探讨了该断裂上强震的危险性。结果表明,晚第四纪以来,安宁河断裂带有强烈左旋走滑和逆冲的双重运动特征,由此可将其划分为南、北两段,北段最后一次活动时间大约在公元15世纪,南段最后一次活动时间为1536年。安宁河断裂带北段的强震危险性大于南段,且未来地震的强度在7.5级左右。On the basis of the image interpretation,geological investigation of the field by Quaternary mapping,sample collecting and difference GPS measuring of the surface etc.,We study the relationship between quaternary geomorphologic features in the Anninghe River Fault Zone.And the adjacent region and the activity of Anninghe Fault Zone.And we analyze the activity characteristics of the Anninghe River Fault Zone since Late Quaternary,and discuss the risk of strong earthquakes in the Anninghe River Fault Zone.The results show that the Anninghe River Fault Zone featured a strong left-lateral strike slip and thrust since the Late Quaternary.The Anninghe River Fault Zone can be divided into two parts;in the north segment,the last earthquake event may occurred around the 15th century AD,in the south segment,the last event may occurred in 1536 in Xichang City of Sichuan Province.The strong-earthquake risk in the north segment of the Anninghe River Fault Zone is higher than the one in the south segment and the future strong earthquake＇s magnitude will be 7.5 or so.

关 键 词：安宁河断裂带 活动断裂 晚第四纪 强震 

分 类 号：P315.725[天文地球—地震学]