盆地と山脈の全域にわたる現在の変形,アメリカ合衆国の西部
1U.S. Geological Survey, MS/977, Menlo Park, CA 94025, USA. Department of Geological Sciences, University of Durham, Science Laboratories, South Road, Durham DH1 3LE, UK.
まとめ
バシン・アンド・レンジ州の変形は,その中心部ではなく,その境界の近くに集中しています. 外板の力は,この拡張的張力場に大きな影響を及ぼします.
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:
- バシン・アンド・レンジ州は,複雑な地質学的変形を示しています.
- この変形の空間的分布を理解することは,地震の危険性評価と地質学モデルにとって極めて重要です.
研究 の 目的:
- バシン・アンド・レンジ州全域の変形分布をマッピングする.
- 観察された変形パターンの背後にある原動力を調査する.
主な方法:
- 800キロメートルに及ぶ密集したグローバル・ポジショニング・システム (GPS) ネットワークを利用した.
- 1992年,1996年,1998年に実施された調査から得た地検データを分析した.
主要な成果:
- 変形は,県の西,東の境界付近に集中しています.
- ユタ州西部とネバダ州東部の中央500キロメートル全域で最小の変形が観察されました.
- 変形パターンは,ホロセンの断層分布と相関しています.
結論:
- 外部のプレート駆動力は,拡張的張力場を調節する上で重要な役割を果たします.
- 密度グラデーションと地形によって影響される内部浮力力は,境界付近の変形にも寄与する.
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