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
杨彦明 1苏淑娟2
作者信息
- 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;内蒙古自治区地震局,内蒙古呼和浩特 010010
- 2. 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
- 折叠
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Ms6.2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Mw6.02.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.
Abstract
The focal mechanism solution of the Jishishan Ms6.2 Earthquake on 18 Decem-ber 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 Mw6.02,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 in-ferred 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-dom-inated faulting mechanism with little strike-slip component.
关键词
2023年积石山Ms6.2地震/震源机制解/质心深度/逆冲断层/拉脊山北缘断裂Key words
The 2023 Jishishan Ms6.2 earthquake/Focal mechanism/Centroid depth/Thrust fault/Northern margin fault of the Lajishan引用本文复制引用
基金项目
中国地震局地震预测开放基金(XH23077D)
内蒙古自治区自然科学基金(2023MS04012)
内蒙古自治区人才开发基金(内人社办函[2023]182号)
山东省地震局一般科研项目(YB2313)
出版年
2024
NETL
NSTL
万方数据