モデル空間検索から内核アニソトロピーに対する堅固な正規モード制約
Caroline Beghein1, Jeannot Trampert
1Faculty of Earth Sciences, Utrecht University, Post Office Box 80021, 3508 TA Utrecht, Netherlands. beghein@geo.uu.nl
まとめ
地球の内核における地震波のアニソトロピーは,P波とS波のパターンを明らかにします. これらの発見は,内核の中心に変化する構造と潜在的な新しい鉄相を示唆しています.
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
- 地球科学 地球科学 地球科学
背景:
- 地球の内核は,複雑な地震特性を示しています.
- 内核のアニソトロピーを理解することは,地力学モデルにとって極めて重要です.
研究 の 目的:
- 地球の内核の地震性アニソトロピーを調査するために.
- P波とS波のアニソトロピーの振る舞いを深さで特徴づける.
主な方法:
- 地震正常モード測定に完全なモデル空間を検索するための新しい技術を適用しました.
- アニソトロピーのパターンを決定するために,異常に分割された正常モードを分析しました.
主要な成果:
- 内核でP波とS波アニソトロピーの強いパターンを観測した.
- P波アニソトロピーのパラメータの変化は,半径約400kmでシグナルを発する.
- S波のアニソトロピーは内核上部では最小であり,より深いところでは負となる.
結論:
- 結果は,大きな中心部距離 (150~180度) での移動時間異常と一致しています.
- モデルは,上部内核に徐々に傾いた六角形の密集した鉄を示唆しています.
- 内核の中心部には異なる鉄相が存在する可能性があります.
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