ハワイのキラウエア火山の静かな滑りによって引き起こされた地震
Paul Segall1, Emily K Desmarais, David Shelly
1Geophysics Department, Stanford University, Stanford, California 94305, USA.
Nature
|July 11, 2006
まとめ
キラウエア火山のスロースリップイベントに伴う高周波地震は,地震活動を誘発することを示唆しています. この発見は,静かな地震の深さを制限し,関連する危険を評価するのに役立ちます.
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
- 火山学 火山学とは
背景:
- スロースリップイベント,または"静かな地震"は,潜水地帯で発生しますが,その深さを決定することは困難です.
- 高頻度地震と関連し,簡単に位置付けられることは稀であり,深さの制約を妨げています.
- 非火山の振動は,時々ゆっくりと滑り込みが伴いますが,正確に位置づけることは困難です.
研究 の 目的:
- スロースリップイベントと高周波地震との関係を調査する.
- 付随する地震性を分析することによって,スロースリップイベントの深さを決定する.
- スロースリップイベントに関連するトリガーメカニズムと潜在的な危険を理解する.
主な方法:
- キラウエア火山のスロースリップイベントに伴う地震群の分析.
- 地震活動の相関関係とスロースリップイベントの進行,特に2005年1月のイベント.
- クーロンブ・ストレスの変化原理を適用して地震の誘発を推論する.
主要な成果:
- 高周波の地震の群れが,Kīlauea.a.のゆっくりとした滑落に伴っていることが観察されました.
- 2005年1月のスロースリップイベントは,地震が引き起こされたことを示唆する地震性の増加に先行しました.
- 地震は7〜8キロの深さで発生し,比較的深さまでゆっくりと滑り落ちるのを抑制しました.
結論:
- 高周波の地震は,ゆっくりと滑るイベントによって引き起こされ,深さの制約を与えることができます.
- トリガーされた地震性の検出は,スロースリップイベントの深さと危険性を理解するために重要です.
- この関連は,スロースリップイベントの際に増加した地震の危険性を定量化するための潜在的な方法を提供します.
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