まとめ
最近のカリフォルニア地震は,モハベ砂漠で新しい断層線が形成されている可能性を示唆しています. この地質学的な特徴は,この地域が構造的ストレスに対応する方法を変化させ,古い断層系に影響を与える可能性があります.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- テクトニクス (地質学) とは
- 地震学 地震学とは
背景:
- モハベ地域は60年間で6回の大きな地震を経験しました.
- ランダーズ地震 (1992年,M=7.3) は,最も最近の出来事です.
- エピセンターの整列は,潜在的な新しい断層系を示唆しています.
研究 の 目的:
- ランダーズ地震の地質学的影響を調査する.
- モハベ中央部の最近の地震活動のパターンを分析する.
- 新しい通行欠陥が発生しているかどうかを判断します.
主な方法:
- 地震の震源と滑り方向の分析.
- モハベ地域における断層システムの地質地図作成.
- 地域ストレスフィールドの評価と断層指向.
主要な成果:
- N15°Wを走行する震源と滑り方向の100kmの配列が特定されました.
- この配置は,地質学的に若い,通行する断層を示唆しています.
- 新しい断層は,古いストライクスリップ断層の代わりになっているかもしれません.
結論:
- 観測された地震パターンは,モハベの新興の断層系を示しています.
- サンアンドレアス断層の曲がりを含む古い断層は,有効性を失っている可能性があります.
- ストレスフィールドに対する断層の方向転換は,地殻の変形の重要な要因です.
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