まとめ
上のマントルの地震速度と重力異常の相関は,西欧アジアと東欧アジアの間に異なっています. ユーラシア東部にある低粘度地帯.
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:
- ユーラシア北部の長波長重力異常は,上層マントルの地震速度の異常と相関しています.
- この相関は,西ユーラシアと東ユーラシアの間の信号の逆転を示しています.
研究 の 目的:
- ユーラシア全土における重力-地震相関における観測された信号の逆転の原因を調査する.
- 大陸内変形を制御する上層マントルの粘度が果たす役割を理解する.
主な方法:
- ユーラシア北部の重力異常データの分析.
- 上層マントルの地震速度のデータとの比較.
- 地域差を特定するための相関分析.
主要な成果:
- 重力と地震速度の異常との相関の有意な横向的な変化が特定されました.
- この変化は,古代のクラトンとより若いオロゲンベルトの間の地質学的な境界に相当します.
- 証拠は,東ユーラシアの下の最上層マントルの低粘度ゾーンを示唆し,西では存在しない.
結論:
- 低粘度上の上層マントルのゾーンの存在または欠如は,観測された地質学的二分法を説明します.
- 上層マントルの強さの横向的な変動は,大陸内変形の位置に大きな影響を与えます.
- この研究は,マントル・レオロジーの重要性が地形構造の特徴を形作る上で重要であることを強調しています.
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