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本文利用1979年—1983年17个台站的总磁场强度资料,分析对比了两台单纯差法,加权差法与回归法在消除外空场干扰方面的优劣。结果表明,回归法在消除地磁背景场,扩大改正台使用范围,提高资料改正精度等方面,优于两台单纯差法与加权差法,并获得了1981年在隆尧地震(Ms=5.8)之前的地磁异常。在震磁关系研究中,地磁资料在消除变化场干扰方面,两台单纯差法,已是延用十几年的传统方法,经这一方法处理的点值离散性,即资料处理精度,受着改正台距的严格限制,若要分析5nT量级的磁变化,外场改正误差取±2.0nT,那末,改正距离必须小于150km,可是,目前河北省及其邻区,绝对观测台网(包括流磁测点),南北长约750km,东南宽约600km,显然,若要检测5nT的磁异常,只有设立多个外场改正台,若此,则势必形成多个资料改正系统,这对震磁关系的空间特征分析,将带来很大的困难。据以上情况,当前,对既能扩大外场改正台的使用范围,又能提高资料处理精度的方法探索,就十分必要,也是亟待解决的问题了。本文选用太阳黑子活动高年时段1979—1983年,用17个台的地磁总强度观测资料,分别用红山台、北京台作为外场改正台(以下简称参考点),在两台单纯差法(以下简称纯差法)进行资料处理的基础上,另用两种方法与其对比,获得了一些初步认识,仅供参考。
In this paper, the total magnetic field strength data of 17 stations in 1979-1983 are compared and analyzed, and the advantages and disadvantages of two simple difference methods, weighted difference method and regression method in the field interference elimination are analyzed and compared. The results show that the regression method is superior to two simple difference methods and weighted difference method in eliminating the geomagnetic background field, expanding the scope of correction station and improving the accuracy of data correction. In addition, Geomagnetic anomalies before. In the study of the relationship between magnetism and magnetism, the two simplex methods of geomagnetic data to eliminate the interference of the changing field have been the traditional method of extending the use of more than ten years. The discretization of the point values handled by this method, namely the accuracy of data processing, To correct the strict limits of station distance, if we want to analyze the magnetic change of 5nT, the correction error of external field should be ± 2.0nT, then the correction distance must be less than 150km. However, at present, the absolute observation network in Hebei Province and its neighbors, Flow magnetic measuring point), about 750km long from north to south and 600km southeast. Obviously, if we want to detect magnetic anomalies of 5nT, we have to set up more than one field correction station. If this happens, multiple data correction systems will inevitably be formed. The spatial characteristics of the relationship analysis, will bring great difficulties. In view of the above, at present, it is very necessary to explore ways to expand the field of use of correction stations in the field and to improve the accuracy of data processing. This is also a problem to be solved urgently. In this paper, we selected the observation data of geomagnetic total intensities of 17 stations in 1979-1983 in high-altitude period of sunspot activity. We use Hongshan station and Beijing station as external field correction station (hereinafter referred to as reference point) Hereinafter referred to as the pure difference method) for data processing, based on the other two methods compared with it, obtained some preliminary understanding, for reference only.