まとめ
大規模な地震には,ゆっくりと滑らかな変形の前兆がある可能性があります. 107の地震の分析により,遅い前駆者を有する20の地震が明らかになり,そのほとんどは海脊系と関連しており,複合的な破裂現象を示唆している.
科学分野:
- 地震学 地震学とは
- 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:
- 大規模な地震は,時々,その主要な破裂に先立つ低周波の地震異常を示します.
- これらの異常は,高周波地震発生前に発生するゆっくりと滑らかな変形現象を示唆しています.
- これらの前駆者を理解することは,地震の物理と危険性評価に不可欠です.
研究 の 目的:
- 浅い焦点の地震における遅い地震前駆者の発生と特性を調査する.
- これらの遅い前体と特定の構造環境との関連を決定する.
- 遅い前兆変形を示す地震の性質を特徴づけるために.
主な方法:
- 107回の浅焦点地震からの低周波地震スペクトルの分析.
- 統計的評価 (95%の信頼レベル) で,有意な遅い前駆者を特定する.
- 特定された遅い出来事とそれらの構造的設定の相関関係 (海洋の変形と大陸の裂け目システム).
主要な成果:
- 分析された107の地震のうち20の地震は,統計的に有意な遅い前兆を示した.
- これらの遅い前駆的なイベントの19は,海洋の変形システムと関連付けられました.
- 1つの遅い前駆体イベントは,東アフリカ・リフト・システム内の大陸内トランスフォーム・フォールトで特定されました.
結論:
- 遅い地震の前駆者は,大規模な地震のサブセットで識別できます.
- これらの遅い地震は,主として,活発な海洋の変形システムと大陸の裂け目と関連しています.
- 遅い前兆を持つ地震は,急速な破裂に先立つゆっくりとした石層の変形によって開始された複合イベントであるようです.
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