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地震 ›› 2018, Vol. 38 ›› Issue (4): 120-131.

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基于余震粒子群算法的极震区快速判定方法研究

郑韵1, 姜立新2, 王辉山1, 王洪栋3   

  1. 1.福建省地震局, 福建 福州 350003;
    2.中国地震台网中心, 北京 100045;
    3.中国地震局第一监测中心, 天津 300180
  • 收稿日期:2017-04-20 发布日期:2019-08-15
  • 作者简介:郑韵(1989-),女,福建南本人,硕士研究生毕业,主要从事地震应急技术和高精度GPS数据处理方法研究。
  • 基金资助:
    地震应急青年重点任务(CEA-EDEM-201609); 福建省地震局科技基金专项(SF201605)

Rapid Determination Method of Magistoseismic Area based on Aftershock Particle Swarm Algorithm

ZHENG Yun1, JIANG Li-xin2, WANG Hui-shan1, WANG Hong-dong3   

  1. 1.Earthquake Administration of Fujian Province, Fuzhou 350003, China;
    2.China Earthquake Networks Center, Beijing 100045, China;
    3. First Crust Monitoring and Application Center, CEA,Tianjin 300180, China
  • Received:2017-04-20 Published:2019-08-15

摘要: 利用1985年以来等震线记录完整的MS≥6.5地震序列资料, 基于余震能量场空间分布, 探索利用粒子群算法构造一个震后6 h内包含所有主震区激发余震的面积最小椭圆作为估计极震区。 统计分析了不同发震方式地震各时段估计震中、 微观震中与宏观震中的偏移, 以及估计影响场方向、 发震断层走向与极震区走向夹角之间的关系。 结果表明, 余震粒子群算法1 h、 2 h、 6 h的估计震中都有效缩小了微观震中与宏观震中的偏离。 走滑型地震最优估计震中出现在震后2 h。 倾滑型地震估计震中在震后6 h达到最优值。 研究显示, 走滑型地震和倾滑型地震, 震后2 h估计影响场方向与极震区走向的夹角均值都小于发震断层走向与极震区走向的夹角均值。 走滑型地震震后1 h估计影响场方向为最优值, 倾滑型地震最优估计影响场方向出现在震后2 h。

关键词: 余震能量场, 粒子群算法, 极震区, 宏观震中

Abstract: Using the isoseismal data of greater than MS6.5 since 1985 and aftershocks energy field, we base on particle swarm algorithm to create the smallest area ellipse which includes all the main excitation aftershocks 6 hours after the quake as the estimated magistoseismic area. We statistically analyse the distances among the estimated epicenter, the micro- and macro- epicenters of different fracture types in each period, as well as the angle among orientations of the estimate influence field, fault strike and direction of meizoseismal region of different fracture types in each period. The results show that aftershock particle swarm algorithm effectively narrows the deviations of micro- and macro- epicenters. The optimal estimation epicenters of strike-slip type earthquake appear 2 hours after the quake. The optimal estimated epicenters of dip-slip type appear 6 hours after the quake.The study reveals that the mean angle between the direction and orientation of meizoseismal region of the estimated influence field 2 hours after the quake is less than the mean angle of fault strike and orientation of meizoseismal area. The optimal estimation orientations of strike-slip type earthquake appear 1 hour after the quake, while the optimal estimated orientations of dip-slip type appear 2 hours after the quake.

Key words: Aftershocks energy field, Particle swarm algorithm, Magistoseismic area, Macroscopic epicenter

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