Altyn Tagh断層システムの低滑り率に関する地質学的証拠
1CIRES & Department of Geological Sciences, University of Colorado, Boulder 80309-0399, USA.
Nature
|March 15, 2000
まとめ
地検データは,アルティン・タグの断層系を明らかにしています.
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
- ジオデシ (Geodesy) とは
背景:
- インドとアジアの衝突は東アジア全体に変形をもたらします.
- Altyn Tagh断層システムの活動は議論されており,地質学的見積もりは幅広く異なります.
- 以前のモデルは,インド・アジア収束に対応する役割に矛盾しています.
研究 の 目的:
- Altyn Tagh断層システム全体の滑り率と収縮を定量化するために.
- 地質学的測定を地質学的および動的モデルの予測と比較する.
- アジアの変形にアルティン・タグ断層システムの寄与を評価する.
主な方法:
- アルティン・タフ断層系 (89°~91°E) にわたる地質測定.
- 左側切断と南北収縮の分析.
- 既存の地質学的滑り率の推定値と動的モデルとの比較.
主要な成果:
- Altyn Tagh断層系を横断する 9 ± 5 mm yr−1 の左側切断.
- Altyn Tagh断層システム全体で3 ± 1mm yr−1の収縮. アルティンタグ断層システム全体で3 ± 1mm yr−1の収縮.
- チベットにおける北南収縮は,東緯90度で9 ± 1 mm yr−1であった.
結論:
- 地質学的データは,一部の地質学的推定値よりも,アルティン・タグ断層システムの滑り率が低いことを示唆しています.
- 測定された変形は,アジア構造のダイナミックモデルからの予測をサポートしています.
- アルティン・タグの断層系は,インド・アジア収束の部分は,これまでいくつかの研究で示唆されていたよりも小さい.
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