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●Matsumura, S., Ohkubo, T., and Imoto, M. (1991)Seismic Swarm Activity in and around the Izu Peninsula Preceding the Volcanic Eruption of July 13, 1989. J. Phys. Earth，39，93-106.
●Ukawa, M., Obara, K., and Fukuyama, E. (1991) Seismic pulses suggesting an impulsive source at the 1989 Ito-Oki subrarine eruption, central Japan. Geopys. Res. Lett.，18，873-876.
●Yamasato,H.,Yokota,T.,and Kashiwabara,S. (1991)Earthquake Swarm and Volcanic Tremors off Eastern Izu Peninsula in 1989 ?Spectral Investigation and Characteristics of Waveforms-. J. Phys. Earth，39，79-92.
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●Takeo, M. (1992) The Rupture of the 1989 Offshore Ito Earthquakes Preceding a Submarine Volcanic Eruption. J. Geophys. Res.，97，6613-6627.