地震の余震は,局所的に,瞬時に動的に発生する
Wenyuan Fan1, Peter M Shearer2
1Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093-0225, USA. w3fan@ucsd.edu.
まとめ
大規模な地震,特に地表波によるダイナミックな誘発は,一般的に300km以内の早期の余震を引き起こす. この発見は,地震の余震のシーケンスにおける動的ストレス変化の役割を明確にします.
科学分野:
- 地震学
- 地震科学
- 地理学
背景:
- 地震の余震は メインショックのストレス変化によって引き起こされます
- 静的な対ダイナミックなストレストリガーの相対的な重要性については,特に近距離から中間の距離で議論されている.
研究 の 目的:
- 早期の余震発生におけるダイナミック・トリガーの役割を調査する.
- 以前は検出されていなかった 早期の余震を特定し 位置づけること
主な方法:
- 大規模な余震 (M≥7) の後の48回の早期余震の検出と位置づけ
- メインショックの到着から200秒以内に発生した余震の分析,高幅の表面波と一致する.
- いくつかの断層の長さ (約) 内の地震に焦点を当てます. 300キロメートル)
主要な成果:
- 48の未知の大規模な余震が確認された.
- 特に地表波によるダイナミックなトリガーが,近距離から中間の距離での早期の余震の一般的なメカニズムであることを観察した.
- メインショックは潜水地域と大陸の境界で, 障害メカニズム (通常の,逆の,ストライクスリップ) にかかわらず,これらの早期の余震を誘発することができます.
結論:
- ダイナミック・トリガーは 早期の余震の発生を促進する上で 根本的な役割を果たします
- この研究は,近距離から中間のフィールドの ダイナミック・トリガリングの 強力な証拠を提供します.
- ダイナミック・トリガリングの理解は地震リスクの評価に不可欠です.
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