大規模な地震が静止している断層に深く浸透する
1Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA.
まとめ
大規模なストラック・スライド断層は 地震の間には静かになることもあり,過去の大規模な断層は 地震発生地帯の奥深くまで広がっていたからです. シミュレーションや最近の出来事で観察されたこの深い断裂の行動は,他の断層の地震の危険性を高めることができます.
科学分野:
- 地震学
- 地理学
- 地震の断裂の動態
背景:
- 大規模な地震の間にはしばしば地震の静寂があるが,現在のモデルでは完全に説明できない現象である.
- 地震発生地帯は,ストレスが集中し,地震間期間中にその基礎に微小地震性をもたらすことが予想されます.
研究 の 目的:
- 大規模なストラック・スライド断層の間地震期における微小地震性の欠如の理由を調査する.
- 過去の大規模な地震における 深い断層の破裂が 観測された地震の静止を 説明できるかどうかを 判断するためです
主な方法:
- 地震間負荷条件下における断層の振る舞いの数値シミュレーション.
- 1857年のフォート・テジョン地震を含む最近の大きな地震の観測データ分析.
主要な成果:
- 集中した微小地震性の欠如は 破裂が地震発生地帯の下まで広がっていることを示唆している.
- 1857年のフォート・テジョン地震は 地震地帯より少なくとも3〜5キロメートル下に 破裂したことを示しています
- 深い破裂は,主要な断層の共通の特徴である可能性があります.
結論:
- 過去の大規模な地震における深い断層の破裂は,地震間地震の静寂の合理的な説明である.
- この深い断裂の行動は,主要な断層システムにおける地震の危険性を理解し,評価する上で重要な意味を持つ.
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