地理学. 地理学. 南九州沖で移動する震動は,浅い潜水界面のゆっくりと滑り落ちる証拠である
Y Yamashita1, H Yakiwara2, Y Asano3
1Institute of Seismology and Volcanology (SEVO), Faculty of Sciences, Kyushu University, 2-5643-29 Shin'yama, Shimabara 855-0843, Japan. yamac@eri.u-tokyo.ac.jp.
まとめ
南九州沖で検出された浅いゆっくりとした地震は,潜水地帯の洞察を提供します. 非常に低周波の地震に関連した彼らの震動活動は,遅い滑りイベントとのつながりを示唆しています.
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
- テクトニクス (地質学) とは
背景:
- の近くの沈殿界面は,大きな地震の断裂と津波の発生を理解するために不可欠です.
- 浅い,ゆっくりとした地震は,この複雑な地質学的な地域への重要な洞察を提供します.
研究 の 目的:
- 浅層の地震活動と,浅層プレート界面における非常に低周波地震 (VLFE) との関係を分析する.
- 浅い潜水地帯での震動移動パターンを調査するために.
主な方法:
- 海洋底の地震計を活用して,日本の九州南部の沖合の地震性を監視した.
- VLFEに関連した低周波震の1ヶ月のエピソードを記録し,分析しました.
主要な成果:
- 浅いプレート界面でVLFEに関連した浅い低周波振動の完全なエピソードが観察されました.
- 2つの異なる振動移動モードを特定しました: ゆっくりとした大規模の拡散と急速な逆転です.
- 浅と深い震動の移動パターンの類似点に注目した.
結論:
- 観測された震動とVLFEの活動は,エピソード的な遅いスリップイベントの移住とつながっていることを示唆しています.
- 浅い振動の移動特性は,他の潜流ゾーンにおける深い振動の特性に似ています.
- スロースリップイベントは,浅と深い震えとVLFEの両方を引き起こす可能性があります.
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