| 长江三峡地区盐关微地震群的成因机制 |
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| 引用本文： | 杨清源,胡毓良.长江三峡地区盐关微地震群的成因机制[J].地震地质,1993,15(3):247-252. |
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| 作者姓名： | 杨清源 胡毓良 |
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| 作者单位： | 国家地震局地质研究所 北京100029
(杨清源，陈献程，马文涛，胡毓良，胡平)，国家地震局地质研究所 北京100029(赵蒙) |
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| 摘 要： | 盐关微地震群的活动局限在矿区内,地震都是微震和极微震。地震分两种类型:一种是微震活动,初动呈象限分布的双力偶滑动型震源机制,S波能量高于P波能量。另一种是极微震,初动几乎全负,P波能量高于S波能量,呈非双力偶的张破裂向内爆炸型的震源机制。两种地震的成因都是采矿诱发地震,不能做为仙女山断层向北延伸的证据
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| 关 键 词： | 长江三峡 盐关 微震群 近场观测 矿山地震 |
FORMATION MECHANISM OF MICROEARTHQUAKE SWARM IN YANGUAN AREA ON THE YANGTZE GORGES |
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| Yang Qingyuan Chen Xiancheng Ma Wentao Hu Yuliang Hu Ping Zhao Meng.FORMATION MECHANISM OF MICROEARTHQUAKE SWARM IN YANGUAN AREA ON THE YANGTZE GORGES[J].Seismology and Geology,1993,15(3):247-252. |
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| Authors: | Yang Qingyuan Chen Xiancheng Ma Wentao Hu Yuliang Hu Ping Zhao Meng |
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| Abstract: | The activity of microearthquake swarm is limited in an area of coal mine. There are two types of microearthquakes: one is the microearthquakes the first motion of which distributed in a quadrant belongs to double-couple sliding focal mechanism, with S wave energy higher than P wave energy. The other is the extreme-low microearthquakes, with P wave energy higher than S wave energy. The focal mechanisms are the nondouble-couple. Both they are coal-mine tremors, which can not be considered as an evidence for the northern extension of the Xiannushan fault. |
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| Keywords: | Yangtze Gorges Yanguan Microearthquake swarm Near-field observation Coal-mine tremors |
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