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大気・海洋・海底の結合による地球の連続的な自由振動の刺激
Junkee Rhie1, Barbara Romanowicz
1Berkeley Seismological Laboratory and Department of Earth and Planetary Science, University of California, Berkeley, California 94720, USA.
Nature
|October 1, 2004
まとめ
地球 地球 地球 地球 地球
科学分野:
- 固体地球地質物理学 固体地球地質物理学
- 地震学 地震学とは
- 海洋学 海洋学とは
背景:
- 地球は,地震記録 (2-7mHz) で検出される"ハム"として知られる連続した振動を示しています.
- ブームの興奮レベルは,中程度の地震に匹敵し,小さな地震事件に起因することはできません.
- ゆっくりとした地震を含む,このハムの起源に関する以前の仮説は,大気または海洋の過程を指し示し,ほとんど排除されている.
研究 の 目的:
- 地球のハム興奮の源を検出し,位置づけるために配列ベースの方法を開発し,適用する.
- ハムの生成に関連する主要な地理的地域と季節的変動を特定する.
主な方法:
- 配列ベースの地震検出と位置決定の方法論を使用しました.
- 地震データを分析して,自由振動のピークが2〜7mHzの範囲にあることを特定しました.
- 季節的,地理的要因と相関するhum興奮源.
主要な成果:
- 地球のブームは,北半球の冬の間,主に北太平洋で発生します.
- このハムは,南半球の冬の間,南の海から発生します.
- 配列ベースのメソッドは,hum興奮源を成功裏に検出し,位置づけました.
結論:
- 地球のブームは,大気,海洋,海底の相互作用によって主に発生します.
- 嵐のエネルギーは,海洋の低重力波に変換され,その後,海底の地形と相互作用して,水分を生成します.
- この研究は,気象パターンを地球規模の地震気温と結びつけるメカニズムの強力な証拠を提供します.
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