阿蘇火山におけるフーリエ変換赤外分光法(FT-IR)による火山噴気の遠隔観測

概要

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We have applied FT-IR remote sensing to the measurement of the volcanic gases of Aso volcano, central Kyushu, Japan, which has inaccessible fumaroles in an active crater. The observations were carried out three times between August 1996 and August 1997. As a result, in all observations, CO, CO_2, SO_2 and HCl were remotely detected and those column concentrations were estimated by comparison between theoretical and observed spectra. The observed CO/CO_2 and CO_2/SO_2 changed accompanying with the fumarolic temperamre. The observed CO_2/SO_2 decreased from August 1996 to April 1997 and increased from April 1997 to August 1997. As the variation of CO_2/SO_2 may attribute to the depth of magma degassing, the depth of magma degassing may have become shallow from August 1996 to April 1997 and deep from April 1997 to August 1997. The observed HCl/SO_2 showed low values (0.02 to 0.04) during the period. They are typical values at the quiescent stage of this volcano.
特定非営利活動法人日本火山学会の論文
1999-06-30