サンアンドレアスの深い断層の周期的,混沌とした,そして倍増した地震の繰り返しの間隔
1U.S. Geological Survey, Menlo Park, CA 94025, USA. dshelly@usgs.gov
まとめ
カリフォルニア州パークフィールドの近くの小さな地震は,3-6日の間隔で繰り返されるパターンを示しています. これらの地震の再発パターンは複雑であるが,より大きな地震のタイミングについての洞察を提供することができる.
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
- 地震科学 地震科学 地震科学
背景:
- 地震の再発の理解は,地震の危険性評価に不可欠です.
- 大規模な地震の長い再発間隔は,その変動性の研究を制限する.
- 小規模な地震は,再発パターンに対するよりアクセシブルな窓を提供します.
研究 の 目的:
- 低周波地震爆発の再発パターンを分析するために.
- 地震配列の時間的な複雑性と変動性を調査する.
- 小さな地震と大きな地震の再発の間の潜在的な類似性を探求する.
主な方法:
- 8.5年間の地震データシーケンスの分析.
- 900以上の低周波地震爆発の再発間隔の定量化.
- 振動や再発パターンの急激な変化を特定する.
主要な成果:
- 低頻度地震の発生間隔を緊密に集約して観測した.
- 繰り返しの間隔で識別された振動,通常は3日から6日の間です.
- 地震シーケンスにおける突然のパターン変化の事例が記録されている.
結論:
- 小規模地震の再発パターンは複雑さと変動性を表しています.
- これらの発見は,似たような根本的な複雑性が,大規模な地震のシーケンスに影響を与える可能性があることを示唆しています.
- 低周波地震の分析は,より広範な地震の行動を理解するための貴重なプロキシを提供します.
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