Estimation of HCl and Magmatic Steam Fluxes from the Fumarole Area at Kuju-Iwoyama Volcano, Central Kyushu, Japan.

概要

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Magmatic gas consisting of HCl, SO<SUB>2</SUB> and steam etc. is discharged from an area of about 350mx600m in the fumarole area at the active volcano, Mt. Kuju-Iwoyama, Central Kyushu, Japan. The main purposes of this study are to measure the emission rate of fumarolic HCl and to estimate the magmatic steam flux from the fumarole area. The emission rate of HCl from the fumarole area was estimated by a new method developed under this study, which uses the Cl concentration of acid rain precipitated around the fumarole area. The estimated emission rates of HCl range from 3.0 to 8.7 ton/day in 1991 and 1992, which coincides with fluxes estimated by another method by Ehara et al. (1981) in the late 1970's (0.8∼8.7 ton/day). Based on the Cl concentration of high temperature fumarolic gas condensates from the fumarole area and the HCI emission rate, the magmatic steam flux was calculated to be 360∼1400 ton/day during the early 1990's.
日本地熱学会の論文