ヒマラヤの下のインド亜大陸をイメージする
Vera Schulte-Pelkum1, Gaspar Monsalve, Anne Sheehan
1Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, Colorado 80309-0399, USA. vera.schulte-pelkum@colorado.edu
Nature
|July 1, 2005
まとめ
研究者たちは,ヒマラヤの下にあるインドプレートのイメージを撮影し,その脱皮とモホを明らかにしました. 地震性アニソトロピーは脱皮層の上部に発生し,地殻下部の高速度領域はエクロギット形成を示唆し,チベット高原のダイナミクスに影響を与えます.
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
- 地震学 地震学とは
背景:
- インド亜大陸の地殻は,ヒマラヤとチベット高原の下へと沈む.
- チベットの表面観測は,ヒマラヤの地質学的プロセスによって変更されています.
- ヒマラヤ山脈内のインドプレートの幾何学は,未だに十分に理解されていない.
研究 の 目的:
- ヒマラヤの下の脱毛とモホのイメージを撮るために.
- インドプレートの解体過程の幾何学を理解するために.
- チベット高原における地殻の特性とその影響について調査する.
主な方法:
- 地震反射プロファイリングにより,地下構造物のイメージを作成します.
- 地震データを分析して,脱皮とモホの位置を特定する.
- 地震速度とアニソトロピーの解釈.
主要な成果:
- ヒマラヤの下にあるデコレメントとモホの直接的な地震画像が得られた.
- 強烈な地震性アニソトロピーは,シェアプロセスと地震に関連して,脱毛面の上部に観察されました.
- ヒマラヤ山脈の北に,インド地殻の下部で,エクロジットの兆候である高速の領域が特定されました.
結論:
- この研究は,インドプレートの推力下の幾何学に関する前例のないイメージングを提供します.
- 地震アニソトロピーとエクロジットの形成は,ヒマラヤの構造学とチベット高原の動態に影響を与える重要な要因です.
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