抄録
After completion of the survey in Hokkaido, Tohoku and Kanto districts the second order magnetic survey was extended over the central part of Japan, i.e., Chubu and Kinki districts, where 150 second order magnetic stations were newly established in 1955, besides 37 thired order magnetic stations in the Izu peninsula. In the middle part of the area, anomaly is not distinct, while the geomagnetic anomaly is most remarkable in the Fuji volcanic zone, where the values of anomalies amount to several thousands of gammas.
