ジュアン・デ・フカ海中山脊のアクシアル火山の下にあるマグマ貯蔵庫
1Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York 10964, USA. mwest@ldeo.columbia.edu
Nature
|October 26, 2001
まとめ
Axial火山は,521 km3と推定される大規模なマグマシステムを収容しており,最近の噴火の量をはるかに超えています. これは火山が火山であることを示唆しています.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- 火山学 火山学とは
- 地震学 地震学とは
背景:
- Axial火山は,フアン・デ・フカ山脈の近くにある火山活動が活発な海底山である.
- コブホットスポットと関連しており,1998年に噴火した.
研究 の 目的:
- Axial火山の下にある3次元地震速度の構造を調査するために.
- 底にあるマグマシステムの体積と特性を推定する.
主な方法:
- 地震学データの分析.
- 地下速度構造のイメージング. 地下速度構造のイメージング.
主要な成果:
- 地殻には,浅いマグマ室とより深い貯水池からなる大きな低速度ゾーンが特定されました.
- マグマの総容量は5~21km3と推定されている.
- この量は,1998年に発生した溶融よりも (2倍の大きさ) 大きく大きい.
結論:
- アクシアルの火山での火山噴火は,マグマの総貯蔵量のほんのわずかな部分しか抽出しない.
- マグマ系は,噴火周期に比べて長生きしている可能性が高い.
- 溶融の推定地殻居住時間は,数百年から数千年の範囲です.
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