地震アニソトロピーのサブドクションゾーンフローフィールド: グローバルビュー
Maureen D Long1, Paul G Silver
1Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road, NW, Washington, DC 20015, USA. long@dtm.ciw.edu
まとめ
サブドクション中のマントルの流れは,地震性アニソトロピーを分析することによってよりよく理解できます. トレンチ移動速度は,マントルのの下と内部のマントルの流れパターンを影響し,収束駆動の流れと相互作用します.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- 地震学 地震学とは
- テクトニクス (地質学) とは
背景:
- 沈殿板の形態はよく理解されていますが,関連するマントルの流れは不明です.
- シェア波分裂によって観測される地震性アニソトロピーは,マントルの流れに関する洞察を提供します.
研究 の 目的:
- サブダクションに関連したマントルの流れパターンを特徴付けるために.
- トレンチ移動とマントルの流れの関係を調査する.
主な方法:
- 13のサブドクションゾーンからのシーア・ウェーブ・スプリティング観測をまとめました.
- トレンチ移動速度 (RVt) に関する地震アニソトロピーの変動を分析した.
主要な成果:
- マントル・ケイン・サブスラブ・アニソトロピーの体系的な変動と,の移動速度を観測した.
- トレンチ・モーションによって駆動される トレンチ・パラレル・フローを,スラブの下に支配的な流動として識別した.
- このトレンチ・パラレルフローの大きさのスケールは, 〇V (t) (t) (t) (t) (t) (t) (t) (t) (t) (t) (t) (t) (t) (t) (t) (t) (t) (t) (t) (t) (t) (t) (t) (t) (t) (t) (t)
- の平行流と,マントルのにおける収束駆動の角流との相互作用が実証された.
結論:
- トレンチ移動速度は,潜水中のマントルの流れを制御する重要な要因です.
- トレンチ・パラレル・コーナー・フローの相対的な影響は, V t と収束速度 V c の大きさに依存する.
- 地震アニソトロピーは,マントルの複雑な流れの動態を効果的に明らかにします.
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