2023年甘肃积石山MS6.2地震: 一次逆冲为主的浅源强震

doi:10.12196/j.issn.1000-3274.2024.01.013

地震 ›› 2024, Vol. 44 ›› Issue (1): 167-174.doi: 10.12196/j.issn.1000-3274.2024.01.013

2023年甘肃积石山M_S6.2地震: 一次逆冲为主的浅源强震

杨彦明^1,2, 苏淑娟³

1.中国地震局地质研究所地震动力学国家重点实验室, 北京 100029;
2.内蒙古自治区地震局, 内蒙古呼和浩特 010010;
3.中国矿业大学北京煤炭精细勘探与智能开发全国重点实验室, 北京 100083

收稿日期:2024-01-03 修回日期:2024-01-10 出版日期:2024-01-31 发布日期:2024-03-21
作者简介:杨彦明(1980-), 内蒙古呼和浩特人, 高级工程师, 主要从事地震学和震害评估研究。
基金资助:
中国地震局地震预测开放基金项目(XH23077D); 内蒙古自治区自然科学基金项目(2023MS04012); 内蒙古自治区人才开发基金项目(内人社办函[2023]182号); 山东省地震局一般科研项目(YB2313)

The 2023 Jishishan M_S6.2 Earthquake in Gansu Province, China: A Shallow Strong Earthquake with Thrust-dominated Components

YANG Yan-ming^1,2, SU Shu-juan³

1. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;
2. Earthquake Agency of Inner Mongolia Autonomous Region, Hohhot 010010, China;
3. State Key Labortaory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology, Beijing 100083, China

Received:2024-01-03 Revised:2024-01-10 Online:2024-01-31 Published:2024-03-21

摘要/Abstract

摘要： 基于区域数字地震台网波形数据, 在三维空间内利用波形拟合反演方法获得2023年12月18日甘肃积石山M_S6.2地震最佳震源机制解, 结果表明: 节面Ⅰ走向305°, 倾角56°, 滑动角61°; 节面Ⅱ为走向169°, 倾角43°, 滑动角125°; 矩震级M_W6.02。最佳拟合的空间精细位置为102.377°E, 35.968°N, 深度9 km。结果显示, 地震破裂沿NW方向扩展。初步推断此次地震的发震断层面为节面Ⅱ, 发震断层是拉脊山北缘断裂(积石山东缘断裂), 是一次逆冲为主, 兼少量走滑分量的浅源强震事件。

关键词: 2023年积石山M_S6.2地震, 震源机制解, 质心深度, 逆冲断层, 拉脊山北缘断裂

Abstract: The focal mechanism solution of the Jishishan M_S6.2 Earthquake on 18 December 2023 in Gansu Province was made an inversion by the waveform fitting method in three-dimensional space using the observed waveform from the Regional Seismic Networks in China. The results show that the moment magnitude is M_W6.02, the strike/dip/slip of the first nodal plane are 305°/56°/61° and those of the second nodal plane are 169°/43°/125°. The best fine spatial position of the waveform fitting is 102.377°E, 35.968°N, with depth of 9 km. The results show that main rupture extends along NW direction. It is inferred preliminary that the nodal plane Ⅱ is Fault-Plane, and seismogenic fault is the northern margin fault of the Lajishan mountains (eastern margin fault of the Jishishan mountain). Additionally, the event is a shallow strong earthquake induced by thrust-dominated faulting mechanism with little strike-slip component.

Key words: The 2023 Jishishan M_S6.2 earthquake, Focal mechanism, Centroid depth, Thrust fault, Northern margin fault of the Lajishan

中图分类号:

P315.7

杨彦明, 苏淑娟. 2023年甘肃积石山M_S6.2地震: 一次逆冲为主的浅源强震[J]. 地震, 2024, 44(1): 167-174.

YANG Yan-ming, SU Shu-juan. The 2023 Jishishan M_S6.2 Earthquake in Gansu Province, China: A Shallow Strong Earthquake with Thrust-dominated Components[J]. EARTHQUAKE, 2024, 44(1): 167-174.

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2023年甘肃积石山M_S6.2地震: 一次逆冲为主的浅源强震

The 2023 Jishishan M_S6.2 Earthquake in Gansu Province, China: A Shallow Strong Earthquake with Thrust-dominated Components

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2023年甘肃积石山MS6.2地震: 一次逆冲为主的浅源强震

The 2023 Jishishan MS6.2 Earthquake in Gansu Province, China: A Shallow Strong Earthquake with Thrust-dominated Components

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2023年甘肃积石山M_S6.2地震: 一次逆冲为主的浅源强震

The 2023 Jishishan M_S6.2 Earthquake in Gansu Province, China: A Shallow Strong Earthquake with Thrust-dominated Components