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1. Variation of Geothermal Activity around Iwo-yama, Kirishima Volcanic Group

Author

KAGIYAMA, Tsuneomi, YOSHIKAWA, Shin, OHSAWA, Shinji, MISHIMA, Taketomo, and HUANG, Yu-chih

Subjects
霧島火山群硫黄山, minor eruption, 微小噴火, 地熱活動, geothermal activity, 519.9, Iwo-yama Kirishima Volcanic Group
Abstract

The authors carried out geothermal survey around Iwo-Yama, Kirishima Volcanic Group. Beneath Iwo-Yama, volcanic tremors were observed since August 2014. These tremors associated deformations indicating the increase of pressure just beneath Iwo-Yama. Fumarolic activity reappeared at the summit in December 2015. We detected anomalous increase of ground temperature related with the geothermal activity. We also detected anomalous increase of electrical conductivity and the change in Cl/SO4 ratio in hot spring water. This means a supply of volcanic gas beneath Iwo-Yama.

Published
2017

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