首页|2023年甘肃积石山Ms6.2地震:一次逆冲为主的浅源强震

2023年甘肃积石山Ms6.2地震:一次逆冲为主的浅源强震

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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.
The 2023 Jishishan Ms6.2 Earthquake in Gansu Province,China:A Shallow Strong Earthquake with Thrust-dominated Components
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.

The 2023 Jishishan Ms6.2 earthquakeFocal mechanismCentroid depthThrust faultNorthern margin fault of the Lajishan

杨彦明、苏淑娟

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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

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

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

中国地震局地震预测开放基金内蒙古自治区自然科学基金内蒙古自治区人才开发基金山东省地震局一般科研项目

XH23077D2023MS04012内人社办函[2023]182号YB2313

2024

地震
中国地震局地震预测研究所 中国地震学会地震预报专业委员会 中国地震学会地震流体专业委员会 中国地震学会地震电磁学专业委员会

地震

CSTPCD北大核心
影响因子:0.733
ISSN:1000-3274
年,卷(期):2024.44(1)
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