カリフォルニア南部の地殻の添付トモグラフィー
Carl Tape1, Qinya Liu, Alessia Maggi
1Seismological Laboratory, California Institute of Technology, Pasadena, CA 91125, USA. carltape@gps.caltech.edu
まとめ
カリフォルニア南部の新しい3D地震モデルでは,地殻の大きな変化と盆地のような浅い特徴が明らかにされています. この高度なモデルは,地域の地震リスク評価を改善します.
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
- 地球科学 地球科学 地球科学
背景:
- 地殻の構造を理解することは,地震の危険性分析に不可欠です.
- カリフォルニア南部の地殻の以前のモデルは,詳細な解像度が欠けていました.
研究 の 目的:
- カリフォルニア南部の地殻の高解像度3次元地震モデルを開発する.
- 地震活動に影響を与える浅と深い地殻の特徴を特定する.
主な方法:
- アドジョイント・メソッドを用いた反転戦略を採用しました.
- 波場シミュレーション6800回を含む16回のトモグラフィのイテレーションを実施しました.
- 重要なコンピューティングリソース (0.800万 CPU 時間) を利用しました.
主要な成果:
- 開発されたモデルは,既存のモデルと比較して+/-30%までの局所的な変動があり,実質的な異質性を示しています.
- 沈殿盆を含む浅い特徴と断層の間の構成的なコントラストを特定しました.
- サブドクションで捕獲された海洋地殻の断片など,深層地殻の構造を明らかにし,構造の再建を支援しました.
結論:
- 新しい3D地震模型は,南カリフォルニアの地殻の前例のない詳細を提供します.
- この改善された理解は,より正確な地震リスク評価を容易にする.
- このモデルは,この地域の複雑な構造の歴史を解明するのに役立ちます.
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