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海洋の石層-アステノスフィアのシステムの固有の衰弱の決定
Nozomu Takeuchi1, Hitoshi Kawakatsu1, Hajime Shiobara1
1Earthquake Research Institute, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 1130032, Japan.
まとめ
地震波の分析は,海洋性石層-アステノスフィアシステム (LAS) での周波数依存の弱まりを明らかにする. この違いは,アステノスフィアとリトスフィアを区別するユニークな熱力学特性と分散機構を強調しています.
科学分野:
- 地理学
- 地震学
- 地球科学
背景:
- 海洋性石層-アステノスフィア系 (LAS) はプレート構造を理解するために不可欠である.
- LASの熱力学的性質を特徴づけることは不可欠ですが,困難です.
- 地震波の衰弱は これらの性質を調査する強力なツールを提供します.
研究 の 目的:
- 内在 (アネラスティック) と外在 (分散) の地震波減弱を定量的に分離する.
- 海洋LASの熱力学的性質を推論する.
- リトスフィアとアステノスフィアの間の波の拡散の違いを理解する.
主な方法:
- 広帯域の海底地震計を使って PとSの地震波を記録する.
- 海洋の石層-アステノスフィア系を通る地震波の拡散を分析する.
- 量的に分離する内在的および外在的減弱効果.
主要な成果:
- 高い周波数 (~3 Hz) でアステノスフィアの強い固有の衰弱を観察した.
- 低周波の表面波データと一致する.
- リトスフィアの周波数依存の固有の衰弱を特定した.
- 実験室で観測された幅広いピークの分散がアステノスフィアの特徴であることを実証した.
結論:
- アステノスフィアは周波数依存の無弾性を示し,リトスフィアは周波数依存の衰弱を示している.
- この周波数依存の違いは,アステノスフィアとリトスフィアの異なる熱力学的性質と分散機構に関する新しい洞察を提供します.
- この研究は,海洋アステノスフィアの実験室での分散の役割を明らかにしています.
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