2つのベニオフ・ゾーンの世界的な流行
Michael R Brudzinski1, Clifford H Thurber, Bradley R Hacker
1Geology Department, Miami University, Oxford, OH 45056, USA. brudzimr@muohio.edu
Science (New York, N.Y.)
|June 9, 2007
まとめ
深い地震の2つの層を示しているダブル・ベニョフ・ゾーンは,板の沈下に固有のものです. 彼らの分離はプレート年齢とともに増加し,抗ゴライトの脱水が原因である可能性を示唆しています.
科学分野:
- 地震学 地震学とは
- テクトニクス (地質学) とは
- 地質物理学 地質物理学とは地質物理学です.
背景:
- 深い地震の2つの異なる層によって特徴づけられるダブル・ベニオフ・ゾーンは,地震発生を理解するためのパズルを提示します.
- これらの二重地震層の背後にあるメカニズムとそれらの分離を説明することは,潜水地帯のダイナミクスに関する私たちの知識を前進させるために不可欠です.
研究 の 目的:
- 地震性データを用いて,潜流板内の層分離を特徴付ける.
- 二重ベニオフゾーンの世界的な発生と制御要因を調査する.
主な方法:
- 地震のスラブ-正規分布を分析するために座標回転を利用した.
- 層の分離を定量化するために,グローバル地震性カタログを使用しました.
- 方法論を検証するために,既知の例でベンチマークテストを実施した.
主要な成果:
- グローバル地震性カタログのみを使用して,正確に量化された層分離.
- 世界的に30の潜水地帯のセグメントでデュアル・ベニョフ・ゾーンが特定されました.
- 層の分離は,潜水板の年齢とともに増加することを観察した.
結論:
- ダブル・ベニョフ・ゾーンは,様々な年齢とストレス条件において,プレートに潜入する際に固有の共通の特徴です.
- 年齢とともに層の分離が増加することが観察され,抗ゴライトの脱水はクロライトの脱水よりも妥当なメカニズムとして支持されています.
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