マグマガス組成は,スラグ駆動ストロンボリアン爆発活動の源の深さを明らかにします
Mike Burton1, Patrick Allard, Filippo Muré
1Istituto Nazionale di Geofisica e Vulcanologia, Catania, Italy. burton@ct.ingv.it
まとめ
ストロンボリアン噴火を誘発するガスのスランプは,火山と地殻のインターフェースの奥深く,約3キロメートルの深さで形成されます. この深い起源は,ストロンボリ火山で観測されたスラグ形成と浅い爆発地震の間の断絶を説明しています.
科学分野:
- 火山学 火山学とは
- 地質物理学 地質物理学とは地質物理学です.
- 地質化学 地質化学
背景:
- ストロンボリアン噴火はガススラグの爆発によって特徴付けられていますが,その形成の深さとメカニズムは十分に理解されていません.
- 爆発の地震性は通常浅いため,深いマグマの過程に関する知識のギャップが生じます.
- スラグの形成を理解することは,火山の動乱と噴火のダイナミクスを解釈するために重要です.
研究 の 目的:
- ストロンボリアン噴火の原因となるガススラグの起源の深さを決定するために.
- ガススラグの凝結と上昇を制御するプロセスを調査する.
- 深層スラグの発生と浅層の地震信号の関係を解明する.
主な方法:
- ストロンボリ火山での静止脱ガスと爆発的段階のスペクトル測定.
- ガス組成とバブルダイナミクスの分析.
- スペクトロスコピクデータと地震記録の相関.
主要な成果:
- ガススランプは,火山と地殻のインターフェース (約. 3km) でした.
- 構造的な不連続性と微分バブル上昇は,スラグの深層の凝結を促進します.
- 深いスラグ形成と浅い爆発地震 (約. 250 m) となっている.
結論:
- ストロンボリアン活動におけるガススラグの発生は,浅いレベルだけでなく,かなりの深さで起こります.
- 火山の配管システムの幾何学は,観測された地震信号と噴火スタイルを決定します.
- この深い起源のモデルは,世界中の他のストロンボリアン火山にも適用されるかもしれません.
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