中央のキュリル諸島で,大地震のダブルトと地震的ストレス移転サイクルの大きな地震が発生しました
Charles J Ammon1, Hiroo Kanamori, Thorne Lay
1Department of Geosciences, The Pennsylvania State University, 440 Deike Building, University Park, Pennsylvania 16802, USA.
Nature
|February 1, 2008
まとめ
クリル諸島の近くの2つの大きな地震は,プレート境界断層摩擦が地震活動にどのように影響するかを明らかにしました. このシーケンスでは,圧力の移転と,シブダクティングプレートにおける地震のリスクの増加が強調されています.
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
- テクトニクス (地質学) とは
背景:
- サブドクションゾーンのプレート境界断層は,地震サイクル中に摩擦抵抗を経験します.
- この摩擦は,潜水板内のストレスと地震活動に影響を与えると考えられています.
- 以前の圧縮現象は,クリル諸島近くの摩擦抵抗を示唆した.
研究 の 目的:
- 摩擦抵抗とトリガーされた故障との関係を調査する.
- このようなイベントに関連した地震の危険性の増大を証明するために.
- インタープレートおよびイントラプレート断層の地震発生特性および危険性の違いを明らかにする.
主な方法:
- クリル諸島の近くの2つの大きな地震 (2006年11月,2007年1月) の分析.
- 破裂の特徴とストレス転送プロセスの検討.
- 地震リスクの影響を評価する.
主要な成果:
- マグニチュード8.3の地震により,浅瀬の板の境界が破裂した.
- 数分以内に,外側の上昇で開始された内部プレート拡張地震が発生しました.
- その後のマグニチュード8.1の地震は,太平洋プレートの沈下における正常な断層を破裂させた.
結論:
- 地震のシーケンスでは,沈下する石層内での有意なストレス移転が示されています.
- 明確な破裂の特徴は,地震発生性の異なる性質を強調しています.
- これらの出来事は,サブデュークションゾーンにおけるトリガーされた断層の増大した地震の危険性を強調しています.
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