日本鹿屋台地磁静日变化中可能存在的震磁效应

１９９６年１０月１９日日本九州宫崎（Ｍｉｙａｚａｋｉ）发生７．１级地城,城中距鹿层地磁台约９０ｋｍ。利用Ｓｑ单台Ｚ／Ｈ法分析了１９８１～１９９８年鹿屋台与佘山台的资料,再研究两台视深比随时间的变化,结果表明,地震前一年多时间内视深化出现较大的负异常,同期的佘山与武汉台的视深比曲线未出现类似的异现象。因此,上述异常可能与宫崎地震有关。

Possible seismomagnetic effect existed in the geomagnetic Sq variations of the Kanoya magnetic observatory

This is the second report on the topic whether seismomagnetic signals exist in the Sq variations of three magnetic components before great earthquakes. A great earthquake of M S7 1 occurred on October 19, 1996 near the Kanoya magnetic observatory in Miyazaki, Kyushu, Japan. The distance between the epicenter and the Kanoya observatory is about 90 km. The author analyses the apparent depths of the Kanoya and Sheshan observatories for the period of 24 h using the single station Z/H method ,and investigates the time changes of apparent depth ratio between the two observatories. The results shown in this paper indicate that a negative anomalous change in the time variations of apparent depth ratio appeared within one year interval before the earthquake occurrence.Furthermore , the time changes of apparent depth ratio between the Sheshan and Wuhan for the same interval did not appear significant anomalous change.Therefore, the anomalous change stated above might be related to the Miyazaki earthquake.