摘要
依据公元886～2009年云南MS≥5.0地震资料,分析云南地区中强以上地震序列类型早期划分及空间分布特征。结果认为:云南地区MS≥5.0地震序列以主余型为主,其次为多震型;主余型与多震型地震散布于云南省各个地区,孤立型主要分布于东川、玉溪、盈江等地区。各小区域的地震震型特点为:滇西北地区与云南地区地震类型比例一致;小滇西地区MS≥6地震以多震型为主;滇西南、滇东南地区MS≥6地震序列中主余型比例高达90%与83%。滇东北地区震群型与孤立型约各占一半,其中5～5.9级地震序列中孤立型所占比例为全省之最。
The medium-strong earthquakes （Ms≥5.0） from 886 A.D. to 2009 in Yunnan are classified as 3 sequen- tial types--mainshock-aftershock, multiple mainshock, and single shock. Then the spatial distribution of the 3 types of the earthquakes is studied. We find that the mainshock-aftershock sequence is in the majority in Yunnan, and the multiple mainshock sequence takes the second place. These two types of sequence are widely distributed in Yunnan, and the single shock sequence is mainly distributed in the areas such as Dongchuan, Yuxi, Yinjiang, and so on. In the sub-region of Northwest Yunnan, the proportion of the 3 types of sequence is in accordance with the one in the whole Yunnan area. The multiple mainshock （Ms ≥6. 0） sequence in a special part （called Xiaodianxi） of the West Yunnan is dominant, and the mainshock-aftershock sequence （Ms ≥6. 0） reaches 90% of the total in Southwest Yunnan and 83% in Southeast Yunnan. In Northeast Yunnan, the proportion of the multiple mainshock sequence equals with that of the single earthquake sequence, meanwhile, the proportion of single earthquake （5.0 ≤ M ≤ 5.9） sequence is the highest in Yunnan.
出处
《地震研究》
CSCD
北大核心
2011年第3期255-261,共7页
Journal of Seismological Research
基金
云南省基金重点项目"青藏高原东缘强震活动规律与板缘动力学机制(2010CC006)"
云南省十项措施"云南强震活动与板缘动力学机制研究"项目联合资助
关键词
历史地震
现代地震
序列类型
云南地区
historical earthquakes
modem earthquakes
sequences type
Yunnan region
