中米の溝の曲折による断層とマントルの蛇形化
C R Ranero1, J Phipps Morgan, K McIntosh
1GEOMAR and SFB574, Wischhofstrasse 1-3, 24148 Kiel, Germany. cranero@geomar.de
Nature
|September 26, 2003
まとめ
海の溝の曲に関連する断層は,海洋プレートに水分を供給し,水がどのように貯蔵され放出されるかを説明します. このプロセスは,中程度の深さの地震の原因と関連しています.
科学分野:
- *テクトニック地質物理学と地震学.
- * サブドクションゾーンプロセスと地震の発生.
背景:
- * 沈殿板の脱水は,弓状マグマチズムと中程度の深さ (50~300km) の地震を引き起こすと考えられています.
- *スラブ水分化のメカニズムと位置は,まだ十分に理解されていません.
- * 海洋の地殻とマントルに化学的に結合した水の貯蔵は,重要な問題です.
研究 の 目的:
- * サブダクションゾーンの水分化における,曲げによる断層の役割を調査する.
- * テクトニック・ファブリックが,来るプレートにおける水貯蔵にどのように影響するかを決定する.
- * 断層メカニズムと,中程度の深さの地震の発生を結びつける.
主な方法:
- * 中央アメリカ海溝の地質学と地球物理学的分析.
- * 断層システムのマッピングとその浸透深さ.
- * 断層の大きさと地震の断裂領域の相関.
主要な成果:
- * 曲げに関連した断層は,入ってくるプレートに広範囲に広がる構造構造を作り出します.
- *この織物は地殻と上層マントルの奥深くまで浸透します.
- * 断層は,周囲の寒い地殻とマントルを積極的に水分化する.
結論:
- * 曲げによる断層は,海底プレートに浸透する海水補給の主なメカニズムである.
- * 観測された断層の大きさは,中程度の深さの地震の断層領域と相関しています.
- * この研究は,スラブ水分化の新しいモデルと,地震性との関連性を提供しています.
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