ロサンゼルス地域における断層相互作用と大規模な複雑な地震
Greg Anderson1, Brad Aagaard, Ken Hudnut
1U.S. Geological Survey, 525 South Wilson Avenue, Pasadena, CA 91106-3212, USA. anderson@unavco.org
Science (New York, N.Y.)
|December 13, 2003
まとめ
サン・ジャシント断層の北部で大規模な地震が起こると,シエラ・マドレ・キューカモンガ推力断層システムの大きな破裂を引き起こし,ロサンゼルスに対する地震の危険性を高める可能性があります. 他の断層相互作用がカスケーディング断裂を引き起こす可能性は低い.
科学分野:
- 地震科学は,地震に関する科学である.
- テクトニクス (地質学) とは
- 地質物理学 地質物理学とは地質物理学です.
背景:
- 複雑な地形構造における断層の相互作用は,地震の危険性を高める可能性があります.
- これらの相互作用を理解することは,地震リスクの評価に不可欠です.
研究 の 目的:
- カリフォルニア州南部におけるストライク・スライドとスラスト・フォールシステム間の静的およびダイナミックなフォールトの相互作用をモデル化するために.
- 誘発された地震の可能性と地震の危険性への影響を評価する.
主な方法:
- 静的および動的ストレス変化をシミュレートするために計算モデリングを使用しました.
- シエラ・マドレ・キューカモンガ推力システムとサンアンドレアスとサンハシントのストライクスリップ断層の断層相互作用を分析した.
主要な成果:
- シエラ・マドレ・キューカモンガ推力断層の破裂は,サンアンドレアス断層やサンジャシント断層を誘発する可能性は低い.
- サン・ハシント断層の北部で大きな地震が起きれば,シエラ・マドレ・キューカモンガシステムのカスケーディング破裂を引き起こす可能性がある.
結論:
- カスケーディングの断裂,特にサン・ジャシント断層からの断裂は,ロサンゼルス大都市圏に重大な地震の危険をもたらします.
- この発見は,断層の相互作用の複雑な性質と地震への備えへの影響を強調しています.
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