根据在逢坂山地形变台观测到的近场地震记录,发现了明显的 P 波初动方位偏差,因而就其原因作了考察。观测方法和时间与本文作者1983年已报导的相同,但这次是对观测坑道内的记录中既大而又清晰的 P 波初动振幅作了解析。地震数为31个,其震源资料选自京都大学理学部地震预报观测地区中心的资料和气象厅的 Based on the near-field seismic records observed in the Fengshan terrain, a clear deviation of the initial P wave position was found, and the reason was investigated. The observation method and timing are the same as those reported by the author of this paper in 1983, but this time the analysis of the large and clear initial amplitude of P waves in the recorded boreholes was analyzed. The number of earthquakes is 31, and its source data are selected from the center of the earthquake prediction observation area of ​​the Faculty of Science of Kyoto University and the data of Meteorological Agency