2002年のデナリ断層地震,アラスカ:大規模で,滑り分断されたイベント
Donna Eberhart-Phillips1, Peter J Haeussler, Jeffrey T Freymueller
1U.S. Geological Survey, 4200 University Drive, Anchorage, AK 99508, USA.
Science (New York, N.Y.)
|May 17, 2003
まとめ
2002年のデナリ断層地震は,北米で150年ぶりの最大のストライクスリップ事件で,340kmの断層が破裂した. この研究は,そのメカニズム,破裂の進行,および重要な遠隔効果を詳細に説明しています.
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
- 地震科学 地震科学 地震科学
背景:
- 2002年のデナリ断層地震 (マグニチュード7.9) は,北米で過去150年近くで発生した最大のストラックスリップ地震でした.
- 表面破裂の340キロメートルを生成し,地震のメカニズムと危険性を理解するために重要なデータを提供しました.
研究 の 目的:
- 2002年のデナリ断層地震のメカニズムと断層の特徴を分析するために.
- 複数の断層を含む複雑な破裂進行を調査する.
- 地質学的観測と地球物理的瞬間の間の相関を検証する.
主な方法:
- 表面破裂マッピングの分析.
- 瞬間放出推定のための地質学的データ解釈.
- トリガーされた地震性および遠隔効果の調査.
主要な成果:
- 地震は,スシットナ氷河の断層への突入で始まり,その後,デナリとトツシュンダ断層の右滑りによる.
- 地質学的にマッピングされた表面破裂と地質学的に推論された瞬間放出の間に強い相関が観察されました.
- 破裂の伝播方向では,誘発された地震性を含む異常な強力な遠隔効果が記録されました.
結論:
- 2002年のデナリ断層地震は,異なる断層セグメントとスリップタイプを含む複雑な破裂行動を示した.
- この発見は,大規模なストライクスリップ故障のメカニズムと関連する危険性についての理解を深める.
- この研究は,遠隔地効果を含む大規模な地震の重大な影響を強調しています.
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