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Drain‐back process of basaltic magma in the summit conduit detected by microgravity observation at Izu‐Oshima Volcano, Japan
Author(s) -
Watanabe Hidefumi,
Okubo Shuhei,
Sakashita Shikou,
Maekawa Tokumitsu
Publication year - 1998
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/98gl02216
Subject(s) - geology , volcano , electrical conduit , magma , lateral eruption , basalt , phreatic eruption , magma chamber , summit , seismology , petrology , geochemistry , geophysics , explosive eruption , physical geography , mechanical engineering , geography , engineering
Basalt magma sometimes moves through volcanic conduits causing only minor deformation. In that case, we may detect magma movements directly by microgravity observations. After the 1986 eruption of Izu‐Oshima volcano, we observed anomalous gravity variations localized at the summit. Based on a vertical cylindrical conduit model, we estimate the time variations of the head of magma in the summit conduit and clarify the magma drain‐back process after the 1986 eruption.