ヘス・ディープ (Hess Deep) の海中の伝播による地震構造学
Jacqueline S Floyd1, Maya Tolstoy, John C Mutter
1Department of Earth and Environmental Sciences, Lamont-Doherty Earth Observatory, Earth Institute, Columbia University, 61 Route 9W, Palisades, NY 10964, USA. jsfloyd@ldeo.columbia.edu
まとめ
ガラパゴス山脈の頂点での地震活動は,実験室規模の亀裂の拡散に似ています. これは,山脊が地球殻の中で異常な力なしに安定的に増殖できることを示唆しています.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- テクトニクス (地質学) とは
- 海洋学 海洋学とは
背景:
- ギャラパゴス山脈は,太平洋の東方赤道に位置する海上の山脈である.
- 脊の伝播を理解することは,プレート構造学の鍵です.
- 以前のモデルでは,安定したの伝播のために有意な抵抗力を示唆していた.
研究 の 目的:
- ギャラパゴス山脈上昇の伝播先の地震性と断層パターンを調査する.
- これらのパターンを,実験室規模の亀裂伝播と比較するために.
- 安定した海洋脊の伝播に必要な力を再評価する.
主な方法:
- 東赤道太平洋の水音学データの分析.
- 地震性のパターンの観測.
- ラボスケールの引力裂け模様との比較.
主要な成果:
- 低震度地震は,ヘス・ディープにあるガラパゴス・ライズ (Galapagos Rise) の伝播先に集中している.
- 地震性および断層パターンは,引力裂け目を広げる実験室規模の裂け目を反映しています.
- 裂け目長とプロセスゾーンサイズを持つ伝播スケールの断裂エネルギー.
結論:
- 海洋のは,脆い地殻の中で安定的に増殖することができます.
- 安定したの伝播には例外的な抵抗力が必要とされず,線形弾性破裂力学に基づく以前のモデルに挑戦しています.
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