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
Source Rupture Process of the 2023 M6.2 Jishishan,Gansu Earthquake Using the Regional Seismic Data
罗艳 1朱音杰 2高原1
作者信息
- 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
- 折叠
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.
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 hypo-center 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.
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Key words
The 2023 Jishishan M6.2 earthquake/Source rupture process/Slip distribu-tion/Finite fault引用本文复制引用
基金项目
地震科学联合基金(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(41974063)
出版年
2024