ダイナミックな不安定性により,海洋中部の山脊に変形断層が生じます.
1Swiss Federal Institute of Technology Zurich, Department of Geosciences, Zurich, Switzerland. taras.gerya@erdw.ethz.ch
まとめ
変形断層はプレート境界の不安定性から積極的に形成され,遺伝構造ではない. 数値モデルは,非対称的な成長がこれらの断層を作り出し,プレートダイナミクスとリッジジャンプのためにオフセットが時間とともに変化することを示しています.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- テクトニクス (地質学) とは
- ジオダイナミクスは地力学です.
背景:
- 変形断層は,海中山脊と陸上のプレート構造の重要な特徴である.
- それらは伝統的に,時間の経過とともに恒常的なオフセットを持つ継承された構造物として見られています.
研究 の 目的:
- 中洋の山脊における変形断層形成の基礎となるダイナミックなプロセスを調査する.
- 変換欠陥の伝統的な見方に挑戦し,単に遺伝された構造として.
主な方法:
- プレート構造のプロセスをシミュレートするために数値モデリングを使用しました.
- ダイナミックな不安定性と非対称なプレート成長の概念を組み込んだ.
主要な成果:
- 変形断層は,構造板の境界の動的不安定から積極的に発達する.
- 非対称な板の成長は,自発的に交互の方向で断層形成を開始します.
- その結果,曲がったは,何百万年以内に変形断層へと進化する.
- 骨折に関連した弱化は脱離欠陥を安定させ,オフセットの進化に影響を与えます.
結論:
- 変換欠陥は,単に遺伝された構造ではなく,活発に形成される特徴です.
- プレート境界のダイナミクス,特に非対称的な成長は,変形断層の発生の主な原動力である.
- トランスフォームの故障オフセットは恒定ではなく,継続的かつ不連続的に進化します.
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