ストライション,持続時間,移動,そして深震における潮反応
1Department of Earth and Planetary Science, University of Tokyo, Hongo 7-3-1, Bunkyo, Tokyo 113-0033, Japan. ide@eps.s.u-tokyo.ac.jp
Nature
|July 16, 2010
まとめ
プレート移動に関連したサブドクションゾーンの深い震えは,持続的なインタフェース特性によって制御されます. これらの性質は,震動の持続時間,潮ストレス感受性,移動パターンに影響を与え,地震の過程に関する洞察を提供します.
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:
- サブドクションゾーンの深い震えは,プレート界面のスロースリップイベントから発生し,深さは約30kmです.
- この現象は,巨大地震に先立つ深層プレート運動とストレスの蓄積に関する重要なデータを提供します.
- 以前の研究によると,震えは定期的な間隔,変数移動,潮調節を示している.
研究 の 目的:
- サブダクションゾーンにおける深い震動の制御要因を調査する.
- 震動の特徴とプレートインターフェースの特性との関係を分析する.
- これらのインターフェース特性の長期的な進化を理解するために.
主な方法:
- 震源の正確な位置と,震源の長さの分析,南高潜流地帯,日本.
- 震動行動 (潮感度,移動) と推論されたインタフェース特性との相関関係.
- 拡散的移住のモデリングと拡散性の推定.
主要な成果:
- タイムインヴァリアントインタフェースのプロパティは,震動の動作を制御し,持続時間と移行に影響を与えます.
- 短い震動の持続時間は,より高い潮ストレス感受性および抑制された移動と相関しています.
- 震動の持続時間が長い場合は,10^4 m^2 s^-1.1 の恒常的拡散率を持つ拡散的移動を示します.
- 蛇形化によって影響された脆性/柔らかさの比率と潜在的に関連しているインターフェースの性質は,潜水方向に整合した線状の空間的変化を示しています.
結論:
- 深い震動の行動は,安定した,空間的に変化するインターフェース特性によって支配されます.
- これらの特性は,海底山のような地質学的構造の沈殿によって何百万年にもわたって形成されている可能性が高い.
- これらの特性を理解することは,深層プレート運動と潜水地域における地震の危険性を解読する鍵です.
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