まとめ
火山は,クレーターだけでなく,土壌や井戸から二酸化炭素を放出します. この分散型脱ガス,特にヴァルカノ島では,火山活動のモニタリングとガスの危険性を評価する新しい方法を提供します.
科学分野:
- 地質化学 地質化学
- 火山学 火山学とは
- 環境科学 環境科学
背景:
- 火山による二酸化炭素 (CO2) の排出は,伝統的にアクティブなクレーターで研究されています.
- 最近の研究では,火山の側面からの二酸化炭素の拡散放出が有意であることを示唆しています.
- 横断脱ガス化の理解は,火山の総合的なモニタリングに不可欠です.
研究 の 目的:
- ヴァルカノ島の土壌と水井からの拡散した二酸化炭素 (CO2) 排出量を調査する.
- 横断的な火山ガス放出の起源と特徴を決定する.
- 火山の監視と危険性評価のための分散脱ガス化の可能性を評価する.
主な方法:
- 水井における土壌ガスと空気の分析.
- 二酸化炭素 (CO2),ヘリウム (He),ラドン濃度の測定. 二酸化炭素 (CO2),ヘリウム (He),ラドン濃度の測定.
- 炭素の同位体解析 ( (13) C/(12) C比) とガス比 (He/CO2) を調べました.
主要な成果:
- 大量の二酸化炭素 (CO2) 排出量が,ヴァルカノ島の斜面と峡谷で検出されました.
- フォサ円の斜面からのCO2放出は,火山口の煙突に似た地化学的サインを示し,火山の起源を示した.
- 地峡からのガスはヘリウムと (13) Cで枯渇し,別の源を示唆しました.
- 拡散放射は,かなりのCO2排出量 (日当たり30トン) と潜在的な危険性を有しています.
結論:
- 側面と土壌からの拡散した火山ガス排出は,火山の脱ガス化の重要な構成要素です.
- 地化学および同位体分析は,いくつかの拡散CO2放出の火山起源を確認しています.
- 拡散脱ガス処理は,安全な距離から火山の継続的なモニタリングのための貴重なツールです.
- これらの放射は,ヴァルカノ島の地元住民に直接的な脅威をもたらします.
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