マントルの底辺にある至る所に存在する地震の不連続性の証拠です
1Seismological Laboratory 252-21, California Institute of Technology, Pasadena, CA 91125, USA.
まとめ
地震学的な研究は,地球のマントルの底辺の不連続性を示唆しています. この断絶は,おそらく相変化であり,コア-マントルの境界線より200km上にある.
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:
- 地震波形の研究は,地球のマントルの底辺で鋭い不連続性を示唆しています.
- 観測された移動時間と振幅の変動は,空間的に断続的な不連続性の深さの変化を示しています.
研究 の 目的:
- 観測された地震変動をモデル化し,コア-マントル境界における不連続性の性質を解釈する.
主な方法:
- 地震の移動時間と振幅の変動の分析.
- トモグラフィーから派生した地球規模地震速度の構造を用いて地震三重化のモデリング.
- 地震速度の構造に,至る所に存在する"位階の不連続性を重ねた.
主要な成果:
- 観測された移動時間変動と地震三重化の空間間隔は,至る所に存在する第一次元の不連続性によって再現されます.
- この不連続性は,固体-固体相変化としてモデル化できます.
- この移行は,コアマントルの境界線より200km高く,アディアバティック温度で,クラペイロンの傾きは約6MPa/Kです.
結論:
- どこにでも存在する第一次元の不連続性,おそらく固体-固体相移行は,マントルの底部に存在します.
- この不連続は,コア-マントルの境界線から約200km上に位置し,特定の熱力学特性を表しています.
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