INTERNATIONAL UNION OF GEODESY AND GEOPHYSICS (IUGG) INTERNATIONAL ASSOCIATION OF VOLCANOLOGY AND CHEMISTRY OF THE EARTH'S INTERIOR (IAVCEI) Reports on Volcanic Activities and Volcanological Studies in Japan for the Period from 1999 to 2002 PREPARED FOR IUGG 2003, THE 23TH GENERAL ASSEMBLY, SAPPORO, JAPAN 2 0 0 3 THE VOLCANOLOGICAL SOCIETY OF JAPAN AND NATIONAL COMMITTEE FOR VOLCANOLOGY AND CHEMISTRY OF THE EARTH'S INTERIOR, SCIENCE COUNCIL OF JAPAN NATIONAL COMMITTEE FOR VOLCANOLOGY AND CHEMISTRY OF THE EARTH'S INTERIOR, JAPAN Chairman : Toshitsugu FUJII, Earthq. Res. Inst., Univ. of Tokyo Members : Hiroyuki HAMAGUCHI, Grad. School Sci., Tohoku Univ. Kazuhiro ISHIHARA, Disas. Prev. Res. Inst., Kyoto Univ. Tsuneomi KAGIYAMA, Earthq. Res. Inst., Univ. of Tokyo Setsuya NAKADA, Earthq. Res. Inst., Univ. of Tokyo Hiroshi SHIMIZU, Fac. Sci., Kyushu Univ. Masaki TAKAHASHI, Nihon Univ. Tadahide UI, Grad. School Sci., Hokkaido Univ. Hidefumi WATANABE, Earthq. Res. Inst., Univ. of Tokyo Observers : Teruo KANAZAWA, Maritime Safety Agency Makoto MURAKAMI, Geograph. Surv. Inst. Motoo UKAWA, Nat. Res. Inst. Earth Sci. Disas. Prev. Kozo UTO, Nat. Inst. Adv. Indust. Sci. Tech. (AIST) Hitoshi YAMASATO, Japan Meteorol. Agency LIST OF CONTRIBUTORS Keiji DOI, Japan Meteorol. Agency (
[email protected]) Toshitsugu FUJII, Earthq. Res. Inst., Univ. of Tokyo (
[email protected]) Michael O. GARCIA, Dep. Geology & Geophysics, Univ. of Hawaii (
[email protected]) Hiroyuki HAMAGUCHI, Grad. School Sci., Tohoku Univ. (
[email protected]) Masato IGUCHI, Disas. Prev. Res. Inst., Kyoto Univ. (
[email protected]) Kazuhiro ISHIHARA, Disas. Prev. Res. Inst., Kyoto Univ. (
[email protected]) Tsuneomi KAGIYAMA, Earthq.