継続的な変形と断層は,ニュージーランドの大陸石層を通して進行しています
1Quaternary Research Center and Geophysics Program, University of Washington, Seattle, WA, 98195-1360, USA, and Department of Earth Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, US.
まとめ
ニュージーランドはニュージーランドです.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- 地震学 地震学とは
- プレート・テクトニクス (プレート・テクトニクス)
背景:
- 海洋地域のプレート境界は,通常,狭い断層地帯を示します.
- 広範囲にわたるマントルの変形は,ニュージーランドの地震データによって示唆されています.
研究 の 目的:
- 地震データを用いてニュージーランドの下の変形の性質を調査する.
- 変形が狭い断層に局限しているか,マントルに広く広がっているかどうかを判断する.
主な方法:
- 地震アニソトロピーの分析とP波の遅延.
- シーア波分裂と急速極化方向の測定.
- 南アルプス全域のP波残留物の調査.
主要な成果:
- 地震アニソトロピーとP波の遅延は,狭い断層滑りではなく,広範囲にわたるマントルの変形を示している.
- 剪定波分裂と偏振の方向性は,マントルの石層の単純な剪定を示唆しています.
- P波の変動はスラブの下押しを排除するが,継続的な石層縮小を支持する.
結論:
- ニュージーランドの下のマントル・リトスフィアは,ストライク・スリップ・プレート・モーションに対応するために,広範囲にわたる単純な剪定を経験しています.
- 継続的な変形と著しい縮小 (約. 100km) の石層は,過去6~7百万年にわたって発生しています.
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