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江苏地区自1978年起,已陆续建成地磁绝对观测台近廿个,各台点距一般五十公里左右,其空间分布也较均匀,台站主要任务为每日定时观测地磁场总强度与垂直分量。用地磁总强度F、垂直分量Z及水平分量H(由F、Z求出)的准静日年均值,按Harder等提出的曲面样条函数计算地磁各量于各年度的空间等值线分布及沿东西方向和南北方向的等梯度线分布,结果表明江苏大部份地区地磁场的空间分布符合正常场的特征。这对进行长期连续观测和地震预报探索是有利的。本文尝试用消去正常场的办法来突出局部磁异常,所得到的南京地区局部异常区和以往的地磁及地质研究工作的结论比较吻合。无疑,在地震预报研究及其它磁测资料通化等工作中,都应注意到局部磁异常区的存在。
Since 1978, nearly 20 geomagnetic absolute observatories have been built in Jiangsu Province. Each station is about 50 kilometers away from the general station. Its spatial distribution is also more uniform. The main tasks of the station are to regularly observe the total strength and vertical component of geomagnetic field . Using the geostationary daily average of the total geomagnetic intensity F, the vertical component Z and the horizontal component H (obtained from F and Z), the spatial contour distribution of geomagnetic quantities in each year is calculated according to the curved spline function proposed by Harder et al And along the east-west direction and the north-south direction of the gradient distribution, the results show that the spatial distribution of geomagnetic field in most parts of Jiangsu in line with the normal field characteristics. This is beneficial for long-term continuous observation and exploration of earthquake prediction. This paper attempts to eliminate the normal field approach to highlight the local magnetic anomaly, the local anomaly area obtained in Nanjing and previous geomagnetic and geological research conclusions are more consistent. Undoubtedly, in the study of earthquake prediction and other magnetic measurement data, we should pay attention to the existence of the local magnetic anomaly.