云南地区地震精确定位及其构造意义分析  

Analysis on Accurate Location of Earthquakes in Yunnan Area and Its Tectonic Meaning

作　　者：徐彦[1] 杨晶琼[1] 苏有锦[1] 刘杰[2] 

机构地区：[1]云南省地震局,昆明650224 [2]中国地震台网中心,北京100036

出　　处：《地震研究》2005年第4期340-344,共5页Journal of Seismological Research

基　　金：国家重大基础研究前期研究专项基金(2002CCD01700);云南省"十五"重大项目"地震预测预报实用化技术系统建设";地震科学联合基金(604004)联合资助

摘　　要：运用双差定位法,对云南区域数字地震遥测台网记录的1999～2003年云南地区ML≥1.0地震进行重新定位,得到3000多个地震的精确定位结果.重定位结果显示,在东经100°和103°线附近存在两个震源深度较深的区域,最深达50km,刚好对应金沙江-红河断裂带的北段和小江断裂带.这一结果一方面揭示出这两条深大断裂与地震活动之间存在密切关系,另一方面也表明重定位结果在震源深度和空间分布上都较以前有明显改善.同时,姚安、大姚地震序列的重定位结果也说明双差定位法是一种比较好的地震定位方法.We use double difference location method to relocate 1999 -2003 ML ≥ 1.0 earthquakes recorded by the Yunnan regional digital seismic network, and obtained above 3 000 accurately located results. They show there are two deep earthquake belts near the 100° E and 103°E longitude lines （the maximum depth reaches to 50 km）, just respectively accord with the north section of the Jingshajiang-Honghe fault zone and the Xiaojiang fault zone. This fact not only discloses the close relationship between two deep fault zones and the seismicity but also proves that the relocation resuits are greatly improved in focal depth and spatial distribution. In addition, the relocation results of the Dayao and Yaoan Earthquake sequences also show that the double difference location method is more effective.

关 键 词：地震定位 双差定位法 深大断裂 地震活动 云南地区 

分 类 号：P315.63[天文地球—地震学]