H 2 O emission rate by the volcanic plume during the 2000–2002 Miyakejima volcanic activity | Zendy

Matsushima Nobuo | Zendy

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H 2 O emission rate by the volcanic plume during the 2000–2002 Miyakejima volcanic activity

Author(s) -

Matsushima Nobuo

Publication year - 2005

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 - 10.1029/2005gl023217

Subject(s) - volcano , plume , geology , earth science , environmental science , geochemistry , atmospheric sciences , meteorology , physics

Extremely intense degassing at Miyakejima volcano (Japan) was observed after the 2000 eruption. The H 2 O emission rate was estimated, using a record of infrared thermal images, at 400 kton/day in November 2000. By April 2002, H 2 O emission rate had decreased exponentially to 100 kton/day. The H 2 O emission rate varied in parallel with the SO 2 emission rate except for the early stage in September 2000. The ratio of H 2 O to SO 2 emission rate after November 2000 remained constant at about 10, which is consistent with the H 2 O/SO 2 ratio in the magma. The large rate of H 2 O and SO 2 emission requires efficient degassing at shallow depth. The agreement between the gas composition of the plume and that of dissolved volatiles in melt inclusions indicates H 2 O discharged from the vent was mostly magmatic in origin after November 2000.

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