张斌,苏道磊,申金超, 等. 山东济南4.1级地震序列重定位及其发震构造分析[J]. 华北地震科学,2020, 38(2):85-90. doi:10.3969/j.issn.1003−1375.2020.02.015.
引用本文: 张斌,苏道磊,申金超, 等. 山东济南4.1级地震序列重定位及其发震构造分析[J]. 华北地震科学,2020, 38(2):85-90. doi:10.3969/j.issn.1003−1375.2020.02.015.
ZHANG Bin,SU Daolei,SHEN Jinchao, et al. Relocation of Ji'nan 4.1 Earthquake Sequence and Seismogenic Structure Analysis[J]. North China Earthqauke Sciences,2020, 38(2):85-90. doi:10.3969/j.issn.1003−1375.2020.02.015.
Citation: ZHANG Bin,SU Daolei,SHEN Jinchao, et al. Relocation of Ji'nan 4.1 Earthquake Sequence and Seismogenic Structure Analysis[J]. North China Earthqauke Sciences,2020, 38(2):85-90. doi:10.3969/j.issn.1003−1375.2020.02.015.

山东济南4.1级地震序列重定位及其发震构造分析

Relocation of Ji'nan 4.1 Earthquake Sequence and Seismogenic Structure Analysis

  • 摘要: 利用山东省地震台网和流动台网的观测数据,采用双差定位方法对2020年2月18日山东济南4.1级地震序列进行了重定位,并结合震源机制解对发震构造进行分析。结果表明,重定位后的地震序列呈NW向分布,地震由浅部到深部破裂,破裂方式呈不对称的双侧破裂,震源深度优势范围为3~5 km。震源机制解显示地震序列的P轴方位角近EW向,T轴优势方位近SN向,与区域构造应力场一致。综合重定位后地震展布方向、深部构造形态、震源机制解特征,推测地震活动可能为区域构造应力作用下长清断裂及次级派生断裂活动的结果。

     

    Abstract: Based on the phase observation reports of Shandong regional digital seismic network and mobile observation instruments, we relocated the Ji'nan M4.1 earthquake sequences on 18 Feb. 2020 by double-difference location algorithm, and analyzed the sismogenic structure of the sequences by combining the focal mechanism. The results show that the advantage distribution direction is NW. The focal depth concentrated in the range of 3~5 km with an asymmetric bilateral fracture and occurred from shallow to deep. It's focal mechanism reveals that the azimuth of axes P is nearly EW direction and the azimuth of axes T is nearly SN direction which is consistent with the regional stress field. The focal mechanism solution and the relocated result show that the earthquake sequence may be induced by Changqing faults and its secondary faults under the effects of the regional stress field.

     

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