摘要
2003年7月21日和10月16日,在云南省大姚县境内相继发生62和61级地震,微观震中分别为2595°N,10123°E和2592°N,10130°E;宏观震中分别位于大姚县城北约25km的昙华乡和20km的六苴乡,极震区烈度均为Ⅷ度。两次地震共造成19人死亡,600余人受伤,直接经济损失达100750万元。通过对这两次强震序列的时、空、强等特征进行分析认为①在大姚62级地震序列衰减后期呈现出一些“双震”的特征;②大姚61级地震序列的时空分布仍有异常显示;③大姚62,61级地震的发生是楚雄—南华地震带强震活动进一步向北延伸的表现。
On July 21 and October 16, 2003, two earthquakes of M6.2 and M6.1 occurred in Dayao County of Yunnan Province respectively, the micro-epicenters at 25.95°N, 101.23°E and 25.92°N, 101.30°E; the macro-epicenters at Tanhua Township and Liuju Township, 25?km and 20?km north of the Dayao county town, with the intensity of VIII in the meizoseismal region. 19 people were killed and more than 600 were injured in the two earthquakes and the economic loss reaches as much as 1.0075 billion RMB. Through analyzing the time, space and strength features of the two earthquake sequences, it is discovered: some double-shock type features appeared during the late period of the M6.2 earthquake on July 21; there was anomaly showing in the time-space distribution of the M6.1 earthquake sequence; the occurrence of the earthquakes should be the extending of the strong earthquake activity of the Chuxiong-Nanhua seismic belt further towards north.
出处
《地震研究》
CSCD
北大核心
2005年第1期12-17,共6页
Journal of Seismological Research
基金
中国地震局"十五"重点科研项目(100501-05-07)
云南省地震局"十五"重点项目(YN150105T044)资助.
关键词
大姚地震
地震序列
时空分布
双震
楚雄-南华地震带
Dayao earthquake
earthquake series
time-space distribution
Chuxiong-Nanhua earthquake belt
