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地震 ›› 2024, Vol. 44 ›› Issue (2): 169-177.doi: 10.12196/j.issn.1000-3274.2024.02.012

• • 上一篇    

2023年12月18日甘肃积石山MS6.2地震多点源地震矩张量反演研究

刘俊清1, 张小刚2, 张宇3, 蔡宏雷3, 陈卓3, 包秀敏4   

  1. 1.吉林建筑大学测绘与勘查工程学院, 吉林 长春 130119;
    2.吉林省基础地理信息中心, 吉林省测绘档案资料馆, 吉林 长春 130062;
    3.吉林省地震局, 吉林 长春 130117;
    4.辽宁省地震局沈阳地震监测中心站, 辽宁 沈阳 110161
  • 收稿日期:2024-01-22 修回日期:2024-04-08 出版日期:2024-04-30 发布日期:2024-04-28
  • 通讯作者: 陈卓, 工程师。 E-mail: czx19902024@163.com
  • 作者简介:刘俊清(1977-), 男, 内蒙凉城人, 副教授, 主要从事地震活动性研究。
  • 基金资助:
    吉林省教育厅科学技术研究项目(JJKH20220260KJ)

Study of Seismic Moment Tensor Inversion by Multi-point Sources for Jishishan MS6.2 Earthquake on December 18, 2023, in Gansu Province, China

LIU Jun-qing1, ZHANG Xiao-gang2, ZHANG Yu3, CAI Hong-lei3, CHEN Zhuo3, BAO Xiu-min4   

  1. 1. School of Geomatics and Prospecting Engineering, Jilin Jianzhu University, Changchun 130118, China;
    2. Basic Geographic Information Center of Jilin Province, Jilin Provincial Surveying and Mapping Archives Changchun 130062, China;
    3. Jilin Earthquake Agency, Changchun 130117, China;
    4. Shenyang Earthquake Monitoring Center Station, Liaoning Earthquake Agency, Shenyang 110161, China
  • Received:2024-01-22 Revised:2024-04-08 Online:2024-04-30 Published:2024-04-28

摘要: 基于区域宽频带数字地震台网观测到的地震记录, 采用多点源地震矩张量反演方法对2023年甘肃积石山MS6.2地震进行了地震矩张量反演研究。 结果显示, 该地震震源机制解的NE倾的节面(走向312°, 倾角48°, 滑动角76°)为发震断裂, 主体地震矩从震源向地表沿滑动矢量的方向(方位角236°, 倾伏角40.5°)释放, 主破裂持续时间约为5.8 s, 与此同时, 地震破裂区断层面上发生了次级的双侧破裂。

关键词: 积石山6.2级地震, 地震矩张量, 多点源, 发震构造

Abstract: Based on the observed seismograms from the regional broadband digital seismic network, the multi-point source seismic moment tensor inversion method is employed to perform the seismic moment tensor inversion for the 2023 Jishishan MS6.2 main earthquake in Gansu province, China. The results show that the NE dipping nodal surface (strike 312°, dip 48°, and rake 76°) of the focal mechanism solution is the seismogenic fault. The majority of seismic moments are released from the source to the ground surface along the direction of the slip vector of the focal mechanism solution (azimuth 236°, plunge 40.5°), and the main rupture lasts about 5.8 s. At the same time, the secondary bilateral rupture occurred on the fault plane in the rupture zone of the earthquake.

Key words: Jishishan MS6.2 earthquake, Seismic moment tensor, Multi-point source, Seismogenic tectonic

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