2009年9月,トンガのメガスラストと外側の上昇でほぼ同時に発生した大きな地震
1GNS Science, PO Box 30368, Lower Hutt 5040, New Zealand. j.beavan@gns.cri.nz
Nature
|August 21, 2010
まとめ
2009年のサモア・津波は,通常欠陥の外側上昇の地震と,同時に,ゆっくりと潜水界面の破裂を含む複雑な地震イベントの結果でした. この二重の出来事は,壊滅的な津波の波に大きく貢献しました.
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
- 津波の発生は津波の発生である.
背景:
- 大規模な地震と津波は,通常,潜水地帯の浅い推力欠陥から発生します.
- 2009年のサモア・トンガ津波は,太平洋プレートの外側上昇地域における8度の正常な地震の後でした.
研究 の 目的:
- 2009年のサモア・トンガ津波の発生源メカニズムを調査する.
- 超高層地震と潜在的潜水界面イベントの津波への貢献を決定する.
主な方法:
- グローバル・ポジショニング・システム (GPS) ステーションの移動の分析.
- 海底の圧力センサーデータを用いた津波波モデリング.
- 地震データと津波のフィールド観測の統合.
主要な成果:
- 外部の高さの地震は,ほぼ同時に,マグニチュード8の潜水界面破裂が伴いました.
- この潜水現象は,おそらくゆっくりとした地震であり,津波に大きく貢献しました.
- 証拠によると,潜水事件が,外側の高さの地震を誘発したかもしれない,またはその逆です.
結論:
- 2009年のサモア・トンガ津波は,外側上昇と潜水界面の破裂の両方を含む複雑な地震ダブルで発生しました.
- サブドクションゾーンでのゆっくりとした地震は,大きな地震や津波を引き起こす可能性があります.
- この研究は,沈下ゾーンにおけるストレインの放出と津波発生のメカニズムについての洞察を提供します.
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