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继取得1979年7月9日江苏溧阳6.0级地震磁异常之后,1984年5月21日在江苏黄海勿南沙 M_s6.2地震前,在距震中70公里的东台县弶港,110公里的海安和130公里的射阳地磁台又观测到震前垂直分量的磁异常。其中弶港、海安为正异常,射阳为负异常。本文根据祁贵仲的“膨胀磁效应”模式,粗略地进行了计算,结果基本一致。本文认为,在低纬度地区用较密集的垂直分量台网来捕捉地震磁异常有可能改善地磁方法预报地震的效果。
Following the acquisition of the magnetic anomaly 6.0 on the July 9th, 1979, Liyang, Jiangsu earthquake, on May 21, 1984, before the M_s6.2 Earthquake in No. Nansha, Huanghai, Jiangsu Province, Hai’an and Hai’an, 110 kilometers away from Donggang County, 70 kilometers away from the epicenter, The 130-km Sheyang Geomagnetic Observatory also observed the magnetic anomalies of the vertical component before the earthquake. Of which Hong Kong, MSC is a positive anomaly, Sheyang negative anomalies. According to Qi Guizhong’s “Expansive Magnetic Effect” mode, this paper roughly calculated the results are basically the same. This paper argues that it is possible to improve the effect of geomagnetic methods in predicting earthquakes by capturing seismic magnetic anomalies with more dense vertical component networks in low latitudes.