2011年の東北大震災:流出は溝軸に達した
Toshiya Fujiwara1, Shuichi Kodaira, Tetsuo No
1Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Yokosuka 237-0061, Japan. toshi@jamstec.go.jp
まとめ
2011年の東北大震災は,日本溝軸まで広がる海底の大幅な移動を引き起こした. マルチビームバチメトリーは,水平および垂直の動きが海底に影響することを明らかにしました.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- 海洋地質学 海洋地質学
- 地震学 地震学とは
背景:
- 2011年の東北大震災 (マグニチュード9.0) は,重要な地質的影響を及ぼした主要な地震事件でした.
- コセイズミック・シスプレッションの理解は,地震の影響と津波発生の評価に不可欠です.
研究 の 目的:
- 2011年の東北大震災によって引き起こされたコセシスミック・シスプレッションを検知し,定量化するために.
- 海底の変形の程度と,その関係と断層の破裂を決定する.
主な方法:
- 高解像度の海底地形データを取得するために,マルチビームバチメトリック調査を利用しました.
- 地震前後のバチメトリックデータセットを比較して,海底の移動を特定し,測定します.
主要な成果:
- 日本溝の軸まで広がる重要なコセイミック・シスプレッションが検出され,断層破裂が溝に到達したことを示す.
- 東南方向約50メートルの水平移転と,最も外側の陸面エリアで約10メートルの垂直上昇を測定した.
- 大規模な水平の移転により,陸への斜面で最大16メートルの追加の海底上昇が観察されました.
結論:
- 2011年の東北大震災の断層破裂は,日本溝軸まで広がった.
- 地震は,大きな水平および垂直の動きを含む,実質的なコセイズミック海底変形を引き起こしました.
- バチメトリックデータ分析は,地震による海床の移動を定量化するのに有効です.
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