1994 m = 6.7 のノースリッジ,カリフォルニアの地震のストレス誘発は,その前任者によって引き起こされました
まとめ
1933年以来の南カリフォルニア州の大規模な地震は,近隣の断層にストレスを転送しました. これらのストレス変化は小さくても,将来の地震のタイミングとロサンゼルスの近くでの発生に影響を与える可能性があります.
科学分野:
- 固体地球地質物理学 固体地球地質物理学
- 地震学 地震学とは
- テクトニクス (地質学) とは
背景:
- 地震は,近くの断層のストレス条件を変化させることができます.
- ストレス移転の理解は,地震の危険性評価に不可欠です.
研究 の 目的:
- 1933年以降の歴史的な地震 (M >/= 6) に起因する南カリフォルニアの断層における累積クーロンプレッシャー変化をモデル化するために.
- これらのストレス変化が将来の地震活動に及ぼす潜在的な影響を評価する.
主な方法:
- ストレスの移転をシミュレートするために計算モデルを使用しました.
- 1933年からロサンゼルス近郊で発生した歴史的な地震データ (マグニチュードM>/=6) を分析した.
主要な成果:
- 1933年と1952年の地震は,1971年のサンフェルナンド地震の現場でのストレスを増加させた.
- 1971年のサン・フェルナンド地震は,1987年のウィッティアー・ナローズと1994年のノースリッジの断裂地点でのストレスを増加させた.
- 1994年のノースリッジ地震は,その余震と表面の断層の領域でのストレスを増加させた.
- 1933年以来,1バーを超える累積的ストレス変化がオークリッジ,シエラマドレ,サンタモニカ山脈,エリシアンパーク,ニューポート・イングルウッド断層に与えられてきました.
結論:
- ロサンゼルス近郊で発生した中程度の地震から大規模な地震までのストレスの変化は顕著です.
- これらのストレス変化は小さいものの,断層が故障に瀕している場合,地震の引き金として機能する可能性があります.
- ストレスの移転は,批判的にストレスを受けた断層の将来の地震のタイミングを早めることができます.
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