ナンカイ潜水地帯に沿って分岐するスプレイ断層
Jin-Oh Park1, Tetsuro Tsuru, Shuichi Kodaira
1Institute for Frontier Research on Earth Evolution, Japan Marine Science and Technology Center, Yokosuka 237-0061, Japan. jopark@jamstec.go.jp
まとめ
板の境界から発生する南高潜水地帯で,急に沈むスプレイ断層が特定されました. これらの断層は,マグニチュード8.1のトンナカイ地震からのストレスを収納する上で重要な役割を果たしてい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.
- 地震学 地震学とは
- テクトニクス (地質学) とは
背景:
- ナンカイ潜水地域は地震が活発な地域で,大規模な地震が起こる傾向があります.
- 断層構造を理解することは,地震リスクの評価に不可欠です.
研究 の 目的:
- トナンカイ地震の断裂領域におけるスプレイ断層の存在と特徴を調査する.
- これらのスプレイ断層が地震性ストレスの収納に果たす役割を決定する.
主な方法:
- 地震反射プロフィールの分析.
- 断層の幾何学と,その関係とプレート境界の識別.
主要な成果:
- 断裂地帯では,陸に向かって急激に沈むスプレイ断層が観察されました.
- これらの断層は,プレート境界界面で ~ 10 km の深さで開始されます.
- 断層は地殻の上部を通り,谷軸の陸面に広がっています.
結論:
- スプレイ断層は,ナンカイ潜流地帯における重要な構造的特徴である.
- これらのアクティブなスプレイ断層の滑り方は,弾性ストレスを収納するための潜在的なメカニズムです.
- この発見は,地震の破裂過程と地震の危険性を理解するための意味を持つ.
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