云南地壳形变与丽江7.0级地震  

CRUSTAL DEFORMATION AND THE M 7 0 LIJIANG EARTHQUAKE IN YUNNAN

作　　者：张兴华 宋金玲[1] 王琼伟[1] 邵德盛[1] 

机构地区：[1]云南省地震局

出　　处：《地震研究》1997年第1期72-82,共11页Journal of Seismological Research

摘　　要：本文利用滇西、滇中地区大地垂直形变和跨断层短水准、短基线的监测资料进行综合分析论证，其结果表明：１９９６年２月滇西丽江７０级地震前，该区应力场方向自１９９０年以来产生了由北东—北西的转变，震源区出现高达１０９ｍｍ的垂直差异运动１９９３—１９９６年有７５％的断层形变测点相继出现不同程度的中期、短期和临震异常。大地垂直形变与断层形变的共性演变特征。Comprehensive analysis and demonstration have been made in this paper by using the data from the geodetic vertical deformation, fault-crossing short-leveling and short-base line surveys in middle and western Yunnan. The results show that before the M 7 7 Lijiang earthquake in west Yunnan on Feb.3, 1996, the direction of stressfield in this region has shifted from NE to NW and vertical differential motion come up to 109 mm since 1990 in the focal region; medium and short term and impending anomalies appeared to varying degrees at 75% of fault deformation observation poinsts from 1993 to 1996. The common evolution characteristics of geodetic vertical defromation and fault deformation give a good example for strong earthquake prediction.

关 键 词：云南 地壳变形 地震 震级 

分 类 号：P315.2[天文地球—地震学]