ハワイのキラウエア火山の下にあるマントル断層地帯
Cecily J Wolfe1, Paul G Okubo, Peter M Shearer
1Hawaii Institute of Geophysics and Planetology, University of Hawaii at Manoa, Honolulu, HI96822, USA. wolfe@hawaii.edu
まとめ
キラウエア火山の深い地震は,マグマではなく,構造的断層から発生します. 地震性は,30キロメートルの深さにある低角度断層平面の海面への滑り方を明らかにし,石層のストレスを示しています.
科学分野:
- * 地質物理学と火山学,深層地震活動に焦点を当てています.
背景:
- * キラウエア火山は,深い地震 (>=13 km深さ) を表しています.
- *これらの地震の発生源を理解することは,火山の危険性評価に不可欠です.
研究 の 目的:
- * キラウエア火山での深い地震の特徴と起源を分析する.
- * 構造的断層とマグマ駆動の地震源を区別する.
主な方法:
- * 地震深層ヒポセンターの移転.
- *地震の焦点メカニズム分析.
- * 地質学的データを統合して地震性を解釈する.
主要な成果:
- * 深い地震力は,海面に滑り込む30km深さ,低角度断層地帯に集中しています.
- *地震は主に,脆い石層内の構造的断層を示しています.
- *マグマの移動がこれらの深層の出来事の主な原因ではない.
結論:
- * キラウエアの深い地震は主に構造的であり,おそらくマグマ的ストレスによって引き起こされる.
- * 既存の断層と地域的ストレスが観測された地震性に影響を及ぼしています.
- * 発見は,深層の火山活動と,構造的地震源を区別する.
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