2007年の地震のシーケンス中にスマトラのメガトラストのロックされたパッチの部分的な破裂です
A Ozgun Konca1, Jean-Philippe Avouac, Anthony Sladen
1Tectonics Observatory, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, USA.
Nature
|December 5, 2008
まとめ
2007年のメンタワイ地震は,潜水地帯が異なるパターンで破裂することを示しています. これは,この地域の大規模なメガトラストイベントの可能性が依然として重要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.
- 地震学 地震学とは
- テクトニクス (地質学) とは
背景:
- 2004年のスマトラ・アンダマン地震は,潜水地帯の危険性を強調した.
- サンダ・メガトラストは,メンタワイ地域 (1797,1833) を含む大規模な地震の歴史を持っています.
研究 の 目的:
- 2007年のメンタワイ地震 (M(w) 8.4と7.9とその破裂の特徴を分析する.
- メガスラストの破裂パターンの変動性と,将来の地震イベントへの影響を理解する.
主な方法:
- 2007年のメンタワイ地震の地震データ分析.
- 断裂領域と地震の瞬間を歴史的出来事と比較 (1797年,1833年).
- ストレス状態の評価と,メガトラストの破裂におけるバリアの役割.
主要な成果:
- 2007年の地震では,1833年の地震で被災した面積のほんのわずかな部分しか破壊されなかった.
- メガスラストのロックされた部分の明確なアスペリティが関与していた.
- 放出された地震モメントは,歴史的な出来事と蓄積されたストレスの赤字よりも大幅に小さかった.
結論:
- メガスラストの破裂パターンは,アスペリティの行動 (孤立した対協力的) に基づいて異なる可能性があります.
- 非恒常的な障壁は,破裂の変動性に影響を与えます.
- メンタワイ地域は,将来の大規模なメガトラスト地震の大きな可能性を秘めています.
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