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地震 ›› 2024, Vol. 44 ›› Issue (1): 189-194.doi: 10.12196/j.issn.1000-3274.2024.01.016

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区域地震记录揭示的2023年甘肃积石山6.2级地震震源破裂过程

罗艳1, 朱音杰2, 高原1   

  1. 1.中国地震局地震预测研究所, 地震预测重点实验室, 北京 100036;
    2.河北省地震局, 河北 石家庄 050021
  • 收稿日期:2023-12-22 修回日期:2023-12-25 接受日期:2024-01-02 出版日期:2024-01-31 发布日期:2024-03-21
  • 作者简介:罗艳(1976-), 女, 云南景东人, 研究员, 主要从事地震震源参数研究。
  • 基金资助:
    地震科学联合基金项目(U1939202); 中国地震局地震预测研究所基本科研业务费专项(CEAIEF20220203); 国家自然科学基金项目(41974063)

Source Rupture Process of the 2023 M6.2 Jishishan, Gansu Earthquake Using the Regional Seismic Data

LUO Yan1, ZHU Yin-jie2, GAO Yuan1   

  1. 1. Key Laboratory of Earthquake Prediction, Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China;
    2. Hebei Earthquake Agency, Shijiazhuang 050021, China
  • Received:2023-12-22 Revised:2023-12-25 Accepted:2024-01-02 Online:2024-01-31 Published:2024-03-21

摘要: 基于有限断层模型反演方法, 利用区域宽频带地震波形数据, 反演了2023年12月18日甘肃临夏积石山6.2级地震的震源破裂过程, 获得了积石山地震破裂滑动时空分布: 此次地震是逆冲兼少量走滑型地震, 破裂持续时间约为9 s, 主体能量在前6 s释放, 地震破裂主要沿断层走向向NW方向拓展, 计算得到的标量地震矩为1.39 × 1018 N·m, 相当于MW6.02, 破裂尺度约10 km左右, 最大同震滑动量为35 cm。

关键词: 2023年积石山6.2级地震, 震源破裂过程, 滑动分布, 有限断层

Abstract: We carried out the inversion for finite-fault rupture process of the 2023 M6.2 Jishishan earthquake using the regional broadband seismic data. The result shows that the seismic fault of the Jishishan earthquake is thrust with slight strike-slip components. The rupture lasted about 9 s and the most seismic energy is mainly released within 6 s. The finite-fault slip model shows that the Jishishan earthquake rupture initiated from the hypocenter and expanded northwestward along the fault strike. The total seismic moment released by this fault is 1.39×1018 N·m equal to MW6.02. The rupture length is about 10 km with a maximum coseismic slip of 35 cm.

Key words: The 2023 Jishishan M6.2 earthquake, Source rupture process, Slip distribution, Finite fault

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