Dynamics analysis of atmospheric environment related with volcanic gas at Arimura station in Sakurajima

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  • 桜島における火山ガスに関わる大気環境の動態分析 : 桜島有村地区を中心として
  • サクラジマ ニ オケル カザン ガス ニ カカワル タイキ カンキョウ ノ ドウタイ ブンセキ : サクラジマ アリムラ チク オ チュウシン ト シテ

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At Arimura station located in the south of Sakurajima, SO2 high concentration events exceeding environmental standards occur frequently. When compared year by year, the occurrence frequency differs by about 26 times. Moreover, when Arimura station measures SO2 gas high concentration event, it is often under specific weather conditions. When there are many eruptive activities at Sakurajima volcano, a strong positive correlation is found between the SO2 gas released into the atmosphere from the crater and the SPM concentration at Arimura station. At that time, it can be assumed that the SO2 gas high concentration event, the SPM high concentration event, and the ash fall amount start to increase simultaneously. Based on this fact, administrative agencies should evaluate hazards related to the volcanic activity of Sakurajima volcano.

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