滑坡前线的二次加速度是由缓慢的滑坡事件凝聚在俯冲区驱动的
Ji Wang1,2, Kejie Chen3,4, Sylvain Michel5,6,7
1Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, China.
Nature communications
|October 30, 2025
概括
在卡斯卡迪亚俯冲区的缓慢滑动事件 (SSEs) 可以在大地震之前发生. 摩擦和应力的异质性影响SSE凝聚,影响地震的时间和强度.
科学领域:
- 地质物理学 地质物理学
- 地震学 地震学
- 构造学 构造学 构造学 构造学
背景情况:
- 潜伏区的缓慢滑动事件 (SSEs) 是潜在的地震前体.
- 控制SSE凝聚的物理条件尚不清楚.
研究的目的:
- 调查卡斯卡迪亚潜伏区的SSE凝聚.
- 分析时空进化和SSEs凝聚的触发机制.
主要方法:
- 逆向全球导航卫星系统 (GNSS) 数据用于SSE滑动率演变 (2012-2023年).
- 使用速率和状态摩擦进行了数值模拟,以探索凝聚机制.
主要成果:
- 确定了2021年合并的SSE事件,与2013年的事件不同,发生在时刻率下降期间.
- 观察到2021年凝聚导致滑动率增加和破裂扩张.
- 模拟显示,摩擦异质性和有效的正常应力通过调节传播和相互作用来控制SSE凝聚.
结论:
- 聚合的SSEs受到地底异质性的影响.
- 这些事件虽然没有明显的扩展,但与迁移的SSE和b值变化有关.
- 了解SSE凝聚对于评估未来地震风险至关重要.
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