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マグニチュード7.3のLanders,California,地震によって遠隔操作で誘発された地震力
まとめ
1992年のLanders地震は,米国西部全域で広範囲にわたる地震活動を誘発した. 静的ストレスではなく,地殻液との非線形相互作用が,この遠隔地震の誘発を説明している可能性が高い.
科学分野:
- 地震学 地震学とは
- 地震科学 地震科学 地震科学
- 地質物理学 地質物理学とは地質物理学です.
背景:
- 1992年のランダーズ地震 (Mw 7.3) は,震源から遠く離れた地震活動を引き起こした.
- トリガーされた地震性は,既存の地震性と特定の断層スタイルの領域で,最大1250km離れた場所に発生しました.
研究 の 目的:
- ランダースのメインショックの後に引き起こされた広範囲の地震の背後にあるメカニズムを調査します.
- 静的ストレス変化とダイナミックストレスの相互作用が,遠隔地震を誘発する役割を評価する.
主な方法:
- ランダーズ事件の後の地震分布と特徴の分析.
- 弾性変位モデルを使用して静的ストレス変化の計算.
- 動的ストレスの効果と地殻液の相互作用を考慮する.
主要な成果:
- ランダーズ地震の後,米国西部の地震活動は突然,広く増加した.
- 引き起こされた地震は,通常,地熱または火山地帯の近くに,正常な断層へのストライクスライドを持つ地震的に活発なゾーンに集中していました.
- 静的ストレス変化だけでは,観察されたトリガリングを説明するのに不十分でした.
結論:
- ランダー・メインストックによる遠隔地震の誘発は,静的ストレス変化だけで十分に説明できない.
- 地震波のダイナミック・ストレインと地殻液体 (潜在的にマグマを含む) の間の非線形相互作用は,広範囲にわたる誘発のより妥当な説明を提供します.
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