GEODETIC SURVEY PARTY, Changes in tidal factor during the 1974 Izu-Hanto-Oki earthquake by means of an Askania tidal gravimeter, Rep. Coord. Comm. Earthq. Predict., 8, 67-68, 1975 (in Japanese).
NAKAMURA, K., Volcano as a possible indicator of crustal strain, Kazan (J. Volcanol. Soc. Japan) (ii), 16, 63-71, 1971 (in Japanese).
NAKAMURA, K. and K. TAZAWA, A possible precursor of 1974 Izu-Hanto-Oki earthquake-Rise of the magma head and amplitude increase of volcanic tremors of Miharayama, Izu-Oshima Volcano, Rep. Coord. Comm. Earthq. Predict., 8, 75-77, 1975 (in Japanese).