沿着简单的中央圣安德烈亚斯断层的3D架构和复杂的行为
Yifang Cheng1,2,3,4, Roland Bürgmann5,6, Richard M Allen5,6
1State Key Laboratory of Marine Geology, Tongji University, Shanghai, China. chengyif@tongji.edu.cn.
Nature communications
|June 25, 2024
概括
研究人员绘制了圣安德烈亚斯断层的地图.
科学领域:
- 地质物理学 地质物理学
- 构造学 构造学 构造学 构造学
- 地震学 地震学
背景情况:
- 中央的圣安德烈亚斯断层 (CSAF) 具有简单的大尺度几何,但复杂的地震和无地震变形.
- 了解断层的微小结构对于预测地震行为至关重要.
研究的目的:
- 通过使用地质数据,地震性和微型地震焦点机制,对沿着CSAF的断层区域行为进行调查.
- 揭示CSAF的3D细度结构和地震间动力学.
- 将故障架构与未来的故障行为联系起来.
主要方法:
- 从1984年到2015年,对75,164次地震 (M l ≥ 1) 的分析.
- 使用相对地震辐射模式,应用了改进的焦点机制表征方法.
- 地测观测和地震数据的整合.
主要成果:
- 爬行速率,爬行方向和应力场的第一阶变化是由一个简单的断裂合模型解释的.
- 推断的3D机械性能显示出一个薄弱且合不良的断层区域.
- 复杂的动力学通过理解分布式滑动缺陷,应力异质性和多尺度断裂来统一.
结论:
- CSAF的复杂变形源于其细微的机械性能.
- 一个薄弱且合不良的断层区域有助于各种各样的地震和无地震行为.
- 详细的映射提供了对潜在的未来故障模式的洞察力.
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