海底山と重複するMによる弱いインタープレートカップリング 約7回の地震
Kimihiro Mochizuki1, Tomoaki Yamada, Masanao Shinohara
1Earthquake Research Institute, University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan. kimi@eri.u-tokyo.ac.jp
まとめ
沈下する海底山は,予想どおりのプレートコップリングを強化しないかもしれません. 日本溝の地震データは,沈下する海山の上での弱い結合が示唆され,地震の破裂領域に影響を与えると示唆しています.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- 地震学 地震学とは
- テクトニクス (地質学) とは
背景:
- 沈殿する海底山は,伝統的にプレート間のストレスを増加させると信じられています.
- 最近の地震と実験室のデータは,潜在的に弱いインタープレートカップリングを示しています.
- 海底沈殿の理解は,地震リスクの評価に不可欠です.
研究 の 目的:
- 沈殿する海底山がプレート間結合と地震性に対する影響を調査する.
- 海底沈殿に関連する日本溝の地震データを分析する.
- 地震破裂のダイナミクスにおける海底山の役割を評価する.
主な方法:
- 日本溝で地震調査を行った.
- 繰り返される地震を含む地震性のパターンを分析した.
- 特定の地震事件 (1982 M 7.0) の際に破裂の拡散を調査した.
主要な成果:
- 沈下する海面上の弱いインタープレート結合が観察されました.
- 海底マウントの前部に発生する最小の滑り込みで大きな破裂領域を特定しました.
- 沈下した海底山の幅が,破裂領域の範囲に影響を与える可能性があることを示唆している.
結論:
- 沈殿する海底山は,必ずしもプレート間結合を強化するものではありません.
- 海底の沈殿は複雑な破裂パターンにつながり,地震の行動に影響を与える可能性があります.
- 沈下した海底山の幾何学は,地震破裂の特徴を定義する上で重要な役割を果たします.
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