晋冀蒙与京津冀地区高空间分辨率岩石圈磁场地震地质特征初步研究

Preliminary Study on the Seismogeological Characteristics of the High Spatial Resolution Lithospheric Magnetic Field in Jin Ji Meng and Jing Jin Ji Regions

应用高精度、高密度地面磁测资料,计算获取研究区域F要素高空间分辨率岩石圈磁场数值模型,主要研究模型空间分布特征、与地震地质构造的相关性、历史地震震中在模型中的分布规律与位置特征。研究发现,研究区模型空间结构复杂,局部异常特征表现强烈,总体具有与地形、地层关系密切的分区特征;强磁异常区走向与断裂构造体系总体一致;5级以上历史地震多发生于模型低幅值区、负值区、"0"值线、高梯级带等特殊位置。

The high spatial resolution lithospheric magnetic field numerical model(ΔF) of F elements in the study area is calculated by using the high-precision and high-density ground-based magnetic survey data, and then it is analyzed comprehensively. The main contents include: the spatial distribution characteristics of the model, the correlation with the seismogeological structure, the distribution law and location characteristics of the historical epicenter in ΔF. It is found that the spatial structure of ΔF in the study area is complex, and the local anomaly features are strong, which are closely related to the topography and strata as a whole;the strike of the strong magnetic anomaly area is generally consistent with the fault structural system;the historical earthquakes with m≥5 occur in the low amplitude area, negative value area, "0" value line, high gradient belt and other special locations.