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地震 ›› 2015, Vol. 35 ›› Issue (4): 147-156.

• • 上一篇    

福建仙游震群序列ML≥4.0事件震源机制与序列活动特征

李强1, 李军1, 袁丽文1, 邱毅1, 李锋2, 秦双龙1, 曹轶1   

  1. 1.福建省地震局, 福州 350003;
    2.江苏省地震局, 南京 210014
  • 收稿日期:2015-01-27 出版日期:2015-10-31 发布日期:2020-06-28
  • 作者简介:李强(1985-), 男, 辽宁铁岭人, 助理工程师, 主要从事地震学与地球动力学研究。
  • 基金资助:
    中国地震局震情跟踪课题(201501011)、 福建省地震局青年基金课题(Y201401)资助

Focal Mechanisms and Activity of ML≥4.0 Events in the 2013 Xianyou Earthquake Swarm Sequence in Fujian Province

LI Qiang1, LI Jun1, YUAN Li-Wen1, QIU Yi1, LI Feng2, QIN Shuang-Long1, CAO Yi1   

  1. 1. Earthquake Administration of Fujian Province, Fuzhou 350003, China;
    2. Earthquake Administration of Jiangsu Province, Nanjing 210014, China
  • Received:2015-01-27 Online:2015-10-31 Published:2020-06-28

摘要: 基于区域数字台网波形资料, 采用CAP方法反演了福建仙游震群序列中ML≥4.0的5次显著事件的震源机制解。 同时, 结合金钟水库水位变化过程对震群序列活动特征进行了分析。 结果显示, 5次ML≥4.0显著地震事件的震源机制解较为接近, 根据震群空间分布, 确定震源破裂面为NW向节面, 倾角较陡, 震源破裂类型为右旋走滑型; 发震构造为沙县—南日岛断裂带; 序列中第一个显著事件的震源深度较浅, 仅4 km, 其他4次事件震源深度在9~10 km; 整个震群序列在空间上呈现丛集分布, 活动时间上受水库水位变化调制。 我们分析认为, 仙游震群序列可能是由金钟水库诱发引起。

关键词: 仙游震群, 震源机制, CAP方法, 震源深度, 水库地震

Abstract: Based on waveforms from the Fujian regional seismic network, we obtained focal mechanisms of ML≥4.0 distinct events in the Xianyou swarm earthquake sequence using the CAP method, While temporal and spatial evolution characteristics of the Xianyou earthquake swarm sequence activity was analyzed using the water level change of the Jinzhong reservoir. The results show that foca1 mechanisms of 5 ML≥4.0 distinct events are similar. The NW plane of mechanisms solutions should be the focal rupture plane considering the distribution of the earthquake swarm sequence, and the dip angle is relatively steep. The type of focal rupture is right lateral slip, and the seismogenic structure of this sequence is the Shaxian—Nanridao fault system. Moreover, the focal depth of the first ML≥4.0 event in this sequence is very shallow, only 4 km in depth, and the depth of the other 4 events are about 9~10 km. The entire swarm earthquake sequence shows clusters distribution in space, and the seismicity is controlled by water level in time. the Xianyou earthquake swarm sequence may be induced by the Jinzhong reservoir impounding.

Key words: Focal mechanisms, CAP method, Earthquake swarm sequence, Xianyou Reservoir

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