2023年12月18日积石山6.2级地震的深浅变形构造分析
Deep and Shallow Deformation Tectonics of Jishishan Ms6.2 Earthquake on 18 December 2023 in China
高原 1李心怡 2李抒予 2夏新宇 1杨逸文 1王琼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. 中国地震局地球物理研究所,北京 100081
- 折叠
摘要
2023年12月18日甘肃积石山6.2级地震震源区及邻区绝对板块运动方向与岩石圈方位各向异性有很好的一致性,区域浅地表变形与上地壳各向异性反映的变形特征都出现明显的空间扰动,上地壳的局部不均匀变形和物性差异是积石山地震的深部发震构造背景.地震发生在积石山东缘断裂,该断裂长约30～40 km,短期内不具备发生相当震级或更大地震的深部蕴震构造条件.
Abstract
On December 18,2023,an Ms6.2 Jishishan earthquake occurred in Gansu Prov-ince,China.The direction of absolute plate motion and lithospheric azimuthal anisotropy were consistent in the source area and around.The deformation features by the regional shallow surface deformation and the upper crustal anisotropy display distinct spatial per-turbations.The local inhomogeneous deformation of the upper crust and the difference in physical properties are the deep seismogenic tectonic setting of the Jishishan earthquake.The earthquake occurred at the Jishishan east margin fault,which is approximately 30～40 km long.There are no deep seismogenic tectonic conditions along this fault that could trigger earthquakes of comparable or larger magnitudes in the near future.
关键词
2023年积石山6.2级地震/积石山东缘断裂/各向异性/空间变形扰动Key words
The 2023 Jishishan Ms6.2 earthquake/Jishishan east margin fault/Seismic anisotropy/Spatial deformation perturbations引用本文复制引用
基金项目
国家自然科学基金(4233031142074065)
出版年
2024
NETL
NSTL
万方数据