摘要
对2016~2019年华北中部地区118个流动地磁矢量测点的数据进行处理,得到连续3期岩石圈磁场各要素年变化数据。对得到的ΔY要素各期年变化数据进行网格化处理,利用节点值进行计算,对ΔY梯度空间赋值。分析梯度空间形态发现,高值区和活动断裂分布有较好的对应关系,高值区多沿一个或多个活动断裂延伸,或环活动断裂分布。利用多项式回归法对ΔY进行成分分解,提取区域背景性异常和局部性异常,同样发现局部性异常分布和活动断裂相关性较好。各期梯度高值区和局部异常形态差异性较大,但也有部分高值区或异常显著区延续性存在,尤其在断裂附近,延续性存在的可能和构造应力关系更密切。
This paper processes three issues of annual variation data of lithospheric magnetic field from 2016 to 2019 in central North China.Then we grid the annual change data ofΔY element in each period,and use the node value to calculate and assign a value to theΔY gradient space.We analyze the gradient spatial distribution ofΔY.The results show that there is a certain correspondence between high value areas and active faults.High value areas are mostly extended along one or more active faults or distributed around active faults.By using the polynomial regression method to decompose the magnetic field of lithosphere in certain scales to obtain regional background anomalies and local anomalies,the results show that there is a good correspondence between the distribution of local anomalies and active faults.There are great differences in the morphology of gradient high value areas and local anomalies in each period,but there are also some high value areas or anomaly significant areas with continuity,especially near the faults,which may be more closely related to tectonic stress.
作者
刘德强
LIU Deqiang(Hebei Earthquake Agency,262 Huaizhong Road,Shijiazhuang 050021,China)
出处
《大地测量与地球动力学》
CSCD
北大核心
2022年第5期499-504,共6页
Journal of Geodesy and Geodynamics
基金
中国地震局“三结合”课题(3JH-202001012)。
关键词
华北中部
岩石圈磁场变化
梯度空间分布
局部性异常
构造相关性
central North China
variation of lithosphere magnetic field
gradient spatial distribution
local anomaly
structural correlation
