古田水口库区M_L 4.8地震成因探讨

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英文篇名：DISCUSSION ON GENESIS OF GUTIAN SHUIKOU RESERVOIR M_L 4.8 中文刊名：大地测量与地球动力学 英文刊名：Journal of Geodesy and Geodynamics 作者：吴绍祖 ; 陈光 ; 关玉梅 ; 倪晓寅 英文作者：Wu Shaozu ; Chen Guang ; Guan Yumei and Ni Xiaoyin(Earthquake Administration of Fujian Province ; Fuzhou 350003) 中文关键词：水口库区 ; 地质构造特征 ; 构造地震 ; 诱发地震 ; 应力场 英文关键词：Shuikou reservoir ; geologic tectonic character ; tectonic earthquake ; induced earthquake ; stress field 出版日期：2009-08-15 机构：福建省地震局; 年：2009 期：S1 出版单位：大地测量与地球动力学

摘要

介绍水口库区地震地质构造特征与地震活动特点,重点分析2008年3月6日古田4.8级地震序列以及震时福建地区应力场特征。分析认为:1)2008年3月水口库区处于明显的应力积累区域;2)古田4.8级地震为构造型水库地震,NE向湾口断裂(F2)是可能的发震构造之一;3)水口水库前两次4级地震发震时间相隔近12年,表明水库水位的升降与发震之间的相关性并不明显,区域构造应力的变化是导致水口库区地震的决定因素。
This paper expatiates the characters in Seismogeologic tectonic and seismicity of Shuikou reservoir,then emphasizes the Gutian ML4.8 seismic sequence and the characteristics of stress field in Fujian area when the earthquake took place on March 6,2008.The preliminary conclusions are as follows.a)The Shuikou reservoir was in a obviously stress accumulation field in March 2008.b)The ML4.8 earthquake was a tectonic earthquake of reservoir,the NE wards Wankou fault may be one of the seismic fault.c) The origin time of the first two M4 events was 12 years,that shows the relation between water's fluctuation and earthquake was not clear and the change of local tectonic stress was determinant factor leading to earthquake of Shuikou reservoir.

引文

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