クランドール・キャニオン (ユタ州) の鉱山崩壊の情報源分析
Douglas S Dreger1, Sean R Ford, William R Walter
1Berkeley Seismological Laboratory, University of California, Berkeley, CA 94720, USA. dreger@seismo.berkeley.edu
まとめ
2007年のユタ州の地震は,異常な放射線パターンを示し,典型的な構造地震ではなく,浅い地下崩壊を示した. 地震瞬間テンソール分析は,崩壊や地震のような異なる地震源を区別することができます.
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
背景:
- 地震現象は,構造的地震や地下崩壊を含む様々な源から発生する可能性があります.
- これらの源を区別することは,地震リスクの評価とモニタリングにおいて極めて重要です.
研究 の 目的:
- ユタ州中部のマグニチュード3.9の地震の地震放射線パターンを分析するために.
- 地震の発生源のメカニズムを決定する.
- 源型差別のための地震モメントテンソール分析の有用性を評価する.
主な方法:
- マグニチュード3.9の地震による地震画像の分析.
- 地震瞬間テンソール解析を用いて地震イベントのモデリング.
- 地震モメントテンソーの結果と,既知の核爆発,鉱山崩壊,構造地震の結果を比較する.
主要な成果:
- 地震イベントは,構造的地震と矛盾する,インプロージー成分が支配する異常な放射線パターンを示した.
- この出来事は,浅い地下崩壊としてモデル化されることが最善です.
- より小さな,崩壊しないソースコンポーネントが特定され,潜在的に故障または周りの媒体の変形に関連しています.
- 異なるソースタイプに対して,異なる地震モメントテンソール結果の異なる集団が観察されました.
結論:
- 地震モメントテンソルは,地下崩壊や構造地震を含む地震源の種類を区別するための貴重なツールです.
- 分析されたイベントは,おそらく浅い地下崩壊によって引き起こされ,おそらくそれに伴う小さな断層が発生した.
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