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７０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.
出处
《地震研究》
CSCD
北大核心
1997年第1期72-82,共11页
Journal of Seismological Research
关键词
云南
地壳变形
地震
震级
Vertical deformation, stress-strain relation, stress measurement, M 7.0 Lijiang earthquake, Yunnan.
