中部アンデスで発生する潜水と衝突の過程は,変換された地震相によって制約されています
1GeoForschungsZentrum Potsdam, Telegrafenberg, Germany.
Nature
|January 5, 2001
まとめ
深層地震画像は,地殻の厚みだけでなく,石層マントルの薄れが,高い中央アンデス山脈に寄与したことを明らかにしています. また,この研究は,納スカプレートにおける遅延型変異反応の証拠も提供しています.
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
- 地震学 地震学とは
背景:
- 中央アンデス山脈は,海洋と大陸の衝突によって形成された主要な山脈です.
- この上昇は,主に過去2000万年にわたって大陸の地殻が厚くなったことによって起因している.
研究 の 目的:
- 中央アンデスの下の深い地殻とマントルの構造をイメージするために.
- この地域の大幅な上昇に起因する構造的過程を調査する.
- ナズカプレートに浸透するナズカプレートの行動を理解するために.
主な方法:
- P-to-S (圧縮から切断) に変換されたテレシーミック波を利用した.
- アルティプラノ高原とプナ高原に一時的な地震ネットワークを展開しました.
- モホの深さの変動と潜水板の構造を分析した.
主要な成果:
- モホの深さは,アルティプラノの下の75キロメートルから,プナ高原の下の50キロメートルまで大きく変化します.
- 高いプナ高原の下の薄い地殻は,石層マントルの薄めが上昇に寄与したことを示唆しています.
- ナスカ板の沈下は120kmまで撮影され,そこではガブロ-エクロジットの変異により地震的に見えなくなります.
- 地殻内低速帯は,高原の下での進行中の変形と部分的な融解を示している.
結論:
- 石層マントルの薄めは,プナ高原の上昇の重要な要因である.
- 遅延した変形反応,特にガブロ-エクロギット変換は,納スカ板の振動と地震性を制御する.
- 地殻内低速帯は,上層と下層の地殻変形プロセスを分離する.
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