小江断裂带地壳运动特征及地震危险性研究  

A study of crustal movement characteristics and seismic hazard of Xiaojiang fault zone

作　　者：刘耀辉[1,2] 李金平[1,2] 王刘伟[1,2] 

机构地区：[1]云南师范大学旅游与地理科学学院,云南昆明650500 [2]西部资源环境地理信息技术教育部工程研究中心,云南昆明650500

出　　处：《测绘工程》2015年第7期58-60,64,共4页Engineering of Surveying and Mapping

基　　金：国家自然科学基金资助项目(41461087)

摘　　要：利用1999~2013年间川滇地区的GPS速度场观测数据和块体模型研究小江断裂带地壳运动特征及地震危险性。结果表明：小江断裂带闭锁程度较高，应变量积累较大，在地表以下6km的闭锁程度约为0．94，滑动亏损速率约为（9．2±0．4）mm／a，整条断裂带左旋走滑速率约为（10．8～12．1）mm／a。结合小江断裂带上的历史地震数据估算，小江断裂带未来地震最大震级为7．3级，与近年来断裂带活动较为活跃相吻合。Using the GPS velocity field data during 1999--2013 in Sichuan-Yunnan region and the block model, it presents the crustal movement characteristics and seismic hazard of Xiaojiang fault zone. The results show that there is a strong locking and high strain accumulation in Xiaojiang fault zone, of which the locking fraction is about 0.94 from the surface to 6 km depth, and the slip deficit rate is about （9.2± 0. 4）mm/a. The fault zone strike-slip rate is about （10. 8- 12.1）mm/a. The records of historical earthquakes in Xiaojiang fault zone are used to calculate that the largest earthquake in the future will be 7.3, which is matched with the fact that for recent years the fault zone has been more active.

关 键 词：小江断裂带 GPS 断层闭锁 走滑速率 地震危险性 

分 类 号：P542[天文地球—构造地质学]