摘要
系统分析了鄂尔多斯块体周缘 1970～ 2 0 0 2年发生的 2 7次 5级左右地震序列的震级结构 ,这些地震序列可分为孤立型、主震型、震群型三种。结果表明 ,该区 2 7次中强地震序列中 ,有 2 2 %为孤立型 ,14 8%为震群型 ,其余为主震型。在已选取的地震序列中 ,无前震以及有 1次前震的比例为 18 5 % ,有 2次或 2次以上的占81 5 %。同时在鄂尔多斯块体西南边缘地震以孤立型为主 ,在鄂尔多斯块体北东东向的主压应力轴线上发生的地震多为震群型。以上结果可作为鄂尔多斯块体地区震后趋势判断的依据。
The magnitudes of 27 M5.0 earthquakes occurred in 1970-2002 at the edge ofErdoss Block have been systematically analyzed. These magnitudes can be divided into 3 types of single one, main shock, and swarms. The results show that among the 27 mid-strong earthquake sequences 22% is the single one, 14.8% for swarm and others for mainshock type. In the selected earthquake sequences, the one without foreshock and only with 1 foreshock accounts for 18.5%, the one with 2 or above for 81.5%. Meanwhile the single type is dominating at the south-west edge of the block, and the swarms mostly occurred at the axis line of compressive principal stress. The result can be taken as evidence to judge the tendency after a strong earthquake.
出处
《地震研究》
CSCD
北大核心
2004年第3期216-218,共3页
Journal of Seismological Research
基金
陕西省地震局青年基金资助
关键词
地震序列
序列类型
活动性
鄂尔多斯块体
earthquake sequence, earthquake sequence type, activity, Erdos Block
