首都圈地区航磁异常与断裂构造关系  

Relationship between aeromagnetic anomalies and fault structures in the capital area of China

作　　者：徐峰 王鑫 樊继迪 XU Feng;WANG Xin;FAN Jidi(National Institute of Natural Hazards,Ministry of Emergency Management of China,Beijing 100085,China)

机构地区：[1]应急管理部国家自然灾害防治研究院,北京100085

出　　处：《地震工程学报》2025年第3期709-715,740,共8页China Earthquake Engineering Journal

基　　金：地球深部探测与矿产资源勘查国家科技重大专项课题(2024ZD1000707);北京市自然科学基金项目(8184090)。

摘　　要：首都圈地区处燕山隆起和华北平原过渡带,构造环境复杂。文章基于较大比例尺的航磁异常数据,进行0°、45°、90°、135°方向的水平一阶及垂直方向一阶求导,详细地解译断裂构造,最终获得首都圈地区NE向、NW向断裂共39条。原始航磁异常场表现出区域北侧的燕山隆起为乱高磁异常,反映了燕山隆起经历的多期构造运动;方向导数图解译的高梯度异常条带与断裂走向匹配较好,在北京坳陷内的NE、NW向断裂的线性特征明显,并且由于北京坳陷内的负异常圈闭,断裂均为岩浆活动性微弱的“干断裂”;垂向导数表明大兴隆起、京西隆起与北京坳陷的边界处有显著高异常梯度带。The capital area of China,located at a tectonic transition zone between the Yanshan uplift and the North China Plain,is characterized by complex structural settings.Using large-scale aeromagnetic anomaly data,horizontal and vertical first-order derivations at 0°,45°,90°,and 135°directions were calculated.Then,the fault structure was interpreted in detail,and a total of 39 NE-and NW-trending faults were identified in the capital area.The original aeromagnetic anomaly field shows disorganized high-amplitude anomalies in the Yanshan uplift in the north of the study area,indicating a multistage tectonic movement.High-gradient anomaly belts derived from the directional derivative map exhibit strong consistency with fault strikes.NE-and NW-trending faults in the Beijing depression display distinct linear features.Because of the negative anomaly traps in the Beijing depression,these faults can be considered“dry faults”with magmatic activity.Vertical derivatives highlight prominent high-anomaly gradient zones along the boundary of the Daxing uplift,Western Beijing uplift,and Beijing depression.

关 键 词：首都圈地区 航磁异常 方向导数 断裂解译 地壳构造 

分 类 号：P313[天文地球—固体地球物理学]