激しい前震とゆっくりと滑り落ちる現象が2014年のイキイケのMW 8.1の地震に先行した
S Ruiz1, M Metois2, A Fuenzalida3
1Departamento de Geofísica, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago, Chile. sruiz@dgf.uchile.cl.
まとめ
2014年のイキケ地震は前震移転とスロースリップイベントが先行した. これらの地震活動は,既知の地震のギャップで発生し,地震の前駆者の洞察を提供しました.
科学分野:
- 地球科学 地球科学 地球科学
- 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.
背景:
- チリ北部のサブドクションゾーンは,認識されている地震の隙間であり,その最後の大きな破裂は1877年である.
- 2014年のイキケ地震 (Mw 8.1) は,この地震のギャップの高度に結合されたセグメントを断ち切った.
研究 の 目的:
- 2014年のイクイク地震の前の地震性および前震メカニズムを調査する.
- 陸上の変形パターンのためのグローバルポジショニングシステム (GPS) のタイムシリーズデータを分析する.
主な方法:
- 前震の位置とメカニズムの分析.
- 陸上のステーションからの連続したGPSタイムシリーズの計算と分析.
- GPSデータに基づくスロースリップイベントのモデリング.
主要な成果:
- イクイク沖の地震性の上昇は2014年1月に始まり,3月16日以降,MW > 6のイベントが数回発生しました.
- フローショックはメインショックの前,約50km北に移動した.
- 陸上GPSデータは,3月16日の西向きの動きを明らかにし,メインショックのエリアでゆっくりと滑り落ちたことを示しています.
結論:
- 2014年のイキケ地震は,大きな前震活動と緩やかな滑りイベントが先行した.
- これらの前駆的なイベントは,地震のギャップとして特定された地域で発生し,地震予測の研究に貴重なデータを提供しました.
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