プレートテクトニクスとマントルの流れのダイナミクス: 地元のスケールからグローバルスケールへ
Georg Stadler1, Michael Gurnis, Carsten Burstedde
1Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, TX 78712, USA.
まとめ
高解像度の地球マントル流動モデルは,プレート構造がプレート境界の力によってどのように駆動されているかを明らかにしています. この研究は,スラブ降下がプレート運動と地球における消散にどのように影響するかを示しています.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- テキトノフィジックスの物理学です.
- コンピューティングジオダイナミクス
背景:
- プレート構造はプレート境界の力によって支配されるが,高解像度の地球マントルの流動モデルは計算的に難しい.
- これらの力を理解するには,マントルのコンベクションとプレート相互作用の詳細なシミュレーションが必要です.
研究 の 目的:
- 高解像度の地球マントルの流動モデルを開発・利用し,プレート構造の動態を調査する.
- 個々のプレートマージンを1kmまで解明し,前例のないモデルの精度を実現します.
主な方法:
- パラレルコンピューティングアーキテクチャでアダプティブメッシュ精製アルゴリズムを使用.
- プレート運動をグローバルマントルの流れシミュレーションに組み込みました.
- 1kmスケールで個々のプレートマージンが解消されました.
主要な成果:
- バック・アーク拡張とスラブ・ロールバックは,上層マントルのスラブ降下の発生的な結果として特定されました.
- 下層マントルの冷たい熱的異常は,狭い高粘度板を通して海洋プレート速度に影響を与えます.
- 溝の石層内の粘着性分散は,全石層とマントルの分散の5-20%を占めています.
結論:
- 先進的な計算方法により,地球マントルの流れとプレート構造の高解像度モデリングが可能になります.
- スラブダイナミクスは,プレート運動と地球マントルの内部でのエネルギー分散に大きく影響します.
- この研究は,プレート構造とマントルの動態を駆動する力について重要な洞察を提供します.
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