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本文分析了1975—1979年苏鲁皖地区地磁场总强度测量资料中可能存在的各种偶然误差和系统误差。在考查测区所有测点磁场变化的基础上,发现地磁总强度有一定的空间和时间分布特征,可以将整个测区划分为正常区、过渡区和异常区。提出用分区的时间叠加法,统计研究苏鲁皖地区地磁总强度的时空变化规律。结果表明:正常区和过渡区的磁场没有明显的变化,而异常区则有11γ左右的上升趋势。和华东地区地磁总强度长期变化的正常规律背景相比较,认为此上升趋势可能是长期变化局部差异的反映,而可能不是地震前兆。
This paper analyzes the various contingent errors and systematic errors that may exist in the geomagnetic field total intensity measurement data from 1975 to 1979 in the area of Sulu Wan. On the basis of examining the change of magnetic field at all measuring points in the survey area, it is found that the total intensity of geomagnetism has certain spatial and temporal distribution characteristics. The whole survey area can be divided into normal area, transitional area and abnormal area. The time superposition method of zoning is proposed to study the temporal and spatial variation regularity of geomagnetic total intensity in Sulu-wan area. The results show that there is no obvious change in the magnetic field in the normal zone and the transition zone, while the abnormal zone has an upward trend of about 11γ. Compared with the normal background of the long-term change of total geomagnetic intensity in East China, this upward trend is considered as a reflection of local differences in long-term changes and may not be a precursor to earthquakes.