Hi-Net配列によって撮影された2004年のスマトラ・アンダマン地震の範囲,期間,速度
Miaki Ishii1, Peter M Shearer, Heidi Houston
1Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, IGPP 0225, University of California San Diego, La Jolla, California 92093, USA. mishii@ucsd.edu
Nature
|May 24, 2005
まとめ
科学者たちは,地震の破裂の進行をほぼリアルタイムでイメージする新しい方法を開発しました. この分析は,2004年のスマトラ・アンダマン地震を明らかにした.
科学分野:
- 地震地震学 地震学
- 地質物理学 地質物理学とは地質物理学です.
- テクトニクス (地質学) とは
背景:
- 2004年のスマトラ・アンダマン地震は,大きな破壊力を持つ大規模な地震でした.
- 地震の大きさと破裂の特徴の正確な推定は,地震の危険性を理解するために不可欠です.
- このイベントに関する以前の規模見積もりは様々であり,分析技術の改善の必要性を強調した.
研究 の 目的:
- 直接的な地震破裂イメージングのための新しい方法を導入する.
- 2004年スマトラ・アンダマン地震の空間時間的な進化を決定する.
- この大きな地震の瞬間震度推定と断裂の特徴を精査するために.
主な方法:
- 日本にあるHi-Netの地震配列を大開口アンテナとして利用した.
- 高周波放射線の方向をモニタリングするために,最初に到着した圧縮波を使用しました.
- 地震発生から30分以内に地震破裂の進行を直接画像化するための技術を開発した.
主要な成果:
- 断裂は1,300kmの余震地帯全体にわたって北へ広がった.
- 断裂速度は,約2.8km/sで,8分間の間隔で決定されました.
- スマトラ・アンダマン地震のマグニチュード9.3の地震が確認されました.
- 破裂は,持続時間と範囲の両方において,これまでに記録された中で最も長いと特定されました.
結論:
- 新しいイメージング方法は,地震の断裂動態に関する迅速かつ詳細な洞察を提供します.
- スマトラ・アンダマン地震の断裂の特徴は,マグニチュード9.3の瞬間震度に対応しています.
- このイベントは,記録された地震の歴史の中で前例のない規模の破裂を表しています.
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