密集した地震配列によって明らかになった上層マントルの局所的な地震変形
Asaf Inbal1, Jean Paul Ampuero2, Robert W Clayton2
1Seismological Laboratory, California Institute of Technology, Pasadena, CA 91125, USA. ainbal@gps.caltech.edu.
まとめ
ニューポート・イングルウッド断層 (Newport-Inglewood fault,NIF) は,典型的な大陸変形断層とは異なり,マントルに広がる深い地震活動を示している. この深い地震性は,マントルの流体と石層の境界のオフセットと関連しています.
科学分野:
- 地理学
- 地震学
- 構造学
背景:
- 大陸の変形断層は通常,上層地殻に限られた地震性を表します.
- ロサンゼルス盆地にあるニューポート・イングルウッド断層 (Newport-Inglewood fault,NIF) は,上部マントルに広がる地震活動がある.
研究 の 目的:
- カリフォルニア州ロングビーチの下にある ニューポート・イングルウッド断層 (Newport-Inglewood fault, NIF) の 地震性構造を調査する.
- NIFの岩層マントルの根底で発生する深い地震の性質を特徴づける.
主な方法:
- 地震分析は地震性をマッピングするために使用されました.
- 地震データと地化学的証拠と石層の境界データとの相関関係
主要な成果:
- 地震性は,地層マントルを貫通する局所的なゾーンで特定されました.
- 深い地震は,地殻流体経路の地化学的証拠と,石層-アステノスフィアの境界の鋭い垂直のオフセットと相関しています.
- これらの深い地震は,狭いサイズ分布と弱い時間的なクラスタリングを示します.
結論:
- NIFは,石層のマントルに広がる地震発生の根を持っています.
- 深い地震の特徴は,断層圏内の強い相互作用から弱い相互作用への移行を示唆しています.
- マントラ液体と石層構造は,NIFの深い地震性において重要な役割を果たしています.
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