| 2014年金寨ML3.9震群序列特征研究 |
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| 引用本文： | 倪红玉,沈小七,洪德全,李军辉,郑海刚,赵朋.2014年金寨ML3.9震群序列特征研究[J].地震学报,2015,37(6):925-936. |
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| 作者姓名： | 倪红玉 沈小七 洪德全 李军辉 郑海刚 赵朋 |
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| 作者单位： | 1.中国合肥 230031 安徽省地震局 |
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| 基金项目： | 中国地震局2015年度震情跟踪定向工作任务2015010108中国地震科技星火计划攻关项目XH14026 |
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| 摘 要： | 本文首先采用双差定位方法对2014年金寨ML3.9震群序列进行了重新定位， 然后通过Snoke方法和CAP方法计算了该震群序列中较大地震的震源机制解， 分析了震源参数的时空变化特征． 结果表明: 金寨震群序列密集分布在2 km×2 km范围内， 无明显的展布方向； 其震源深度较浅， 大部分集中在3—7 km． 此外， 金寨震群序列中较大地震的震源机制解基本一致， 两组节面的走向分别为NW向和NNE向， 倾角均较高， 表明该震群序列为近E--W向的水平挤压和近N--S向的水平拉张应力场作用下的走滑型地震活动．
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| 关 键 词： | 金寨震群 双差定位方法 震源机制解 CAP方法 Snoke方法 |
| 收稿时间： | 2015-04-23 |
Characteristics of the ML3.9 Jinzhai,Anhui, earthquake swarm sequence in 2014 |
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| Institution: | 1.Earthquake Administration of Anhui Province, Hefei 230031, China2.National Geophysical Observatory at Mengcheng, Anhui Mengcheng 230026, China3.First Crust Monitoring and Application Center, China Earthquake Administration, Tianjin 300180, China |
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| Abstract: | This paper relocated the ML3.9 Jinzhai, Anhui, earthquake sequence in 2014 with double-difference earthquake location algorithm firstly, and then calculated the focal mechanisms of stronger earthquakes of the swarm by using Snoke and CAP methods, respectively. Finally, the spatio-temporal evolutionary characteristics of source parameters were analyzed. The results show that the Jinzhai earthquake swarm sequence was distributed in the dense scope of 2 km×2 km without predominant direction. The focal depth is very shallow, being 3-7 km. In addition, the focal mechanisms of larger earthquakes are basically consistent with each other. The strikes of two nodal planes are separately along the direction of NW and NNE, and the dips of two nodal planes are very high, suggesting the Jinzhai earthquake swarm sequence was caused by strike-slip faulting under the action of horizontally compressed nearly in E-W direction and horizontally extended nearly in N-S direction. |
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