| 鄂尔多斯块体周缘中强地震序列类型及其活动特征 |
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| 引用本文： | 方炜,刘春,张春生.鄂尔多斯块体周缘中强地震序列类型及其活动特征[J].地震研究,2004,27(3):216-218. |
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| 作者姓名： | 方炜 刘春 张春生 |
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| 作者单位： | 陕西省地震局,西安,710068 |
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| 基金项目： | 陕西省地震局青年基金资助 |
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| 摘 要： | 系统分析了鄂尔多斯块体周缘1970—2002年发生的27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27次中强地震序列中，有22％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露名为需群珏!f。以卜结果可作为鄂尔多斯块体地区震后趋势判断的依据。
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| 关 键 词： | 地震序列 序列类型 活动性 鄂尔多斯块体 |
Type of Mid-strong Earthquake Sequence and its Active Features at the Edge of Erdos Block |
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| Fang Wei,Liu Chun,Zhang Chunsheng.Type of Mid-strong Earthquake Sequence and its Active Features at the Edge of Erdos Block[J].Journal of Seismological Research,2004,27(3):216-218. |
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| Authors: | Fang Wei Liu Chun Zhang Chunsheng |
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| Abstract: | 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. |
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| Keywords: | earthquake sequence earthquake sequence type activity Erdos Block |
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