2019年リッジクレスト破裂の動態,相互作用,遅延
Taufiq Taufiqurrahman1, Alice-Agnes Gabriel2,3, Duo Li1
1Department of Earth and Environmental Sciences, Ludwig-Maximilians-Universität München, Munich, Germany.
Nature
|May 24, 2023
まとめ
カリフォルニアの地震の3Dモデルを 開発しました シールズ・バレーとリッジクレストの地震を 関連付けました 我々の発見は 断層システムの相互作用 流体 ストレスが地震のダイナミクスの重要な役割を明らかにし 地震の危険性評価を改善します
科学分野:
- 地理学
- 計算による地震学
- 地震物理学
背景:
- 地震リスクの評価は,観測上の課題と地震物理学の複雑さにより,歴史的に経験的方法に依存してきました.
- 現存するデータ駆動型と物理ベースのモデルは,観測された地震の複雑さと動的行動を完全に説明するのに苦労しています.
研究 の 目的:
- カリフォルニア州で発生した2019年のMw 6.4のシールズ・バレーとMw 7.1のリッジクレスト地震の3D動的断裂モデルを作成する.
- これらの大きな地震を結びつける物理的メカニズムを調査し,複雑な断層システムのダイナミクスを理解します.
主な方法:
- 超コンピューティングを活用して データを吸収した3次元ダイナミックな破裂モデルを開発しました
- 強力な運動,テレシズミック,フィールドマッピング,高速GPS,宇宙ジオデシーを含む多様な観測データセットを統合しました.
- 地震物理学の原理を応用して,観測された地震と地質学データを説明する.
主要な成果:
- シールズ渓谷とリッジクレストの地震のシーケンスを成功裏にモデル化し 出来事の間のつながりを明らかにしました
- 地震動力学と遅延に影響を与える重要な要因として,地域構造,環境ストレス,断層システムの相互作用,過圧流体,および低動力摩擦を特定しました.
- 密度の高い地震記録と3D構造/ストレスデータを調和させるための物理ベースのモデルの能力を実証した.
結論:
- 複雑な断層システムと地震のシーケンスを理解するために,物理に基づいたデータに基づいた共同アプローチが有効です.
- 広範な観測データに関する物理学的解釈は,地質的危険を軽減する戦略に変化をもたらす可能性を秘めています.
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