宋程,马婷,徐小远,等. 2020年北京顺义震群发震机理[J]. 华北地震科学,2022, 40(1):71-76. doi:10.3969/j.issn.1003−1375.2022.01.012.
引用本文: 宋程,马婷,徐小远,等. 2020年北京顺义震群发震机理[J]. 华北地震科学,2022, 40(1):71-76. doi:10.3969/j.issn.1003−1375.2022.01.012.
SONG Cheng,MA Ting,XU Xiaoyuan,et al. Mechanism Analysis of the 2020 Beijing Shunyi Earthquake Swarm[J]. North China Earthquake Sciences,2022, 40(1):71-76. doi:10.3969/j.issn.1003−1375.2022.01.012.
Citation: SONG Cheng,MA Ting,XU Xiaoyuan,et al. Mechanism Analysis of the 2020 Beijing Shunyi Earthquake Swarm[J]. North China Earthquake Sciences,2022, 40(1):71-76. doi:10.3969/j.issn.1003−1375.2022.01.012.

2020年北京顺义震群发震机理

Mechanism Analysis of the 2020 Beijing Shunyi Earthquake Swarm

  • 摘要: 以2020年3—4月北京顺义小震群为研究对象,进行模板匹配遗漏地震检测、波形互相关震相检测、地震精定位、震源机制计算、破裂半径和应力降等震源参数计算,以探究其发震机理。计算结果显示:① 顺义震群发震构造为NW走向,震中呈现由NW向SE的迁移特征;② 除了震群中第一个ML2.4地震无法计算外,另外2次ML2.0以上地震的破裂面均处于之前地震产生的静态应力加载区内;③ 未检测到震群中存在重复地震活动。结合前人提出的震群发震机理模型,分析认为随机性模型可以较好地解释以上计算结果,顺义震群的发震机理可以解释为地震间的应力触发作用,此研究结果可为北京地区地震危险性分析提供科学参考。

     

    Abstract: In order to explore the seismogenesis mechanism of the Beijing Shunyi earthquake swarm in March and April 2020, the missing earthquake detection of template matching, waveform cross-correlation phase detection, earthquake precise location, focal mechanism calculation, rupture radius and stress drop and other focal parameters were carried out. The results show that: ① The seismogenic structure of the Shunyi swarm is NW trending, and the epicenter show the migration characteristics from NW to SE. ② Except for the first ML2.4 earthquake in the swarm that cannot be calculated, the rupture area of the other largest two ML≥2.0 earthquakes are in the static stress loading area generated by previous earthquakes. ③ No repeating earthquakes were detected in the swarm. Combined with the mechanism model of earthquake swarm proposed by predecessors, it is analyzed that the random model can well interpreted the above results. The results of this article may provide scientific reference for seismic risk analysis in Beijing area.

     

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