滇中主要活断层现今活动性研究  

Present-day Activity of the Main Active Faults in Central Yunnan Area

作　　者：李长军[1,2] 甘卫军 秦姗兰[1] 郝明[1] 宋尚武[1] LI Changjun;GAN Weijun;QIN Shanlan;HAO Ming;SONG Shangwu(The Second Monitoring and Application Center,China Earthquake Administration,Xi an 710054,Shaanxi,China;Institute of Geology,China Earthquake Administration,Beijing 100029,China)

机构地区：[1]中国地震局第二监测中心,陕西西安710054 [2]中国地震局地质研究所,北京100029

出　　处：《地震研究》2018年第3期381-389,共9页Journal of Seismological Research

基　　金：中国地震局地震星火项目(XH18069)资助

摘　　要：为研究滇中地区主要断层的活动特征,利用1999—2007年和2011—2017年2期GPS观测资料以及地质资料,基于Okada位错模型反演了研究区域主要断层的滑动速率和闭锁深度。结果表明:(1)红河断裂带的走滑速率为(1.5±1.6)～(4.7±1.5) mm/a,倾滑速率为(-3.6±1.6)～(1.9±2.4) mm/a,断裂南段的活动性更强;(2)无量山断裂和南华—楚雄—建水断裂的走滑速率为(4.0±1.6)～(5.6±1.5) mm/a和(4.8±1.4)～(6.6±1.6) mm/a,倾滑速率分别为(-0.7±1.5)～(0.2±1.4) mm/a和(-5.8±1.5)～(1.7±1.8)mm/a;(3)红河断裂带元江—元阳段和洱源—弥渡段、无量山断裂带和南华—楚雄—建水断裂带西段处于震间闭锁状态,闭锁深度分别为6.8 km,7 km和7.2 km。To analyze characteristics of the main active faults in the central Yunan province,we inverted slip rates and lock depths of the main fault zones according to Okada s fault dislocation model based on GPS observations during 1999-2007,2011-2017 and geologic slip rates.Our results are as follows:(1)the strike-slip rate of the Red River fault is about(1.5±1.6)^(4.7±1.5)mm/a and the dip-slip rate is(-3.6±1.6)^(1.9±2.4)mm/a,while the southern segment is more active than other parts.(2)the strike-slip rates of the Nanhua-Chuxiong-Jianshui fault and the Wuliangshan fault are(4.8±1.4)^(6.6±1.6)mm/a and(4.0±1.6)^(5.6±1.5)mm/a,respectively.And the dip-slip rates are(-5.8±1.5)^(1.7±1.8)mm/a and(-0.7±1.5)^(0.2±1.4)mm/a,respectively.(3)the Yuanjiang-Yuanyang and Eryuan-Midu segments of the Red River fault,the Wuliangshan fault zone,and the western part of the Nanhua-Chuxiong-Jianshui fault are locked,with locking depths of 6.8 km,7 km,and 7.2 km,respectively.

关 键 词：断层滑动速率 闭锁深度 GPS 断层活动性 

分 类 号：P315.725[天文地球—地震学]