在传统稳定的断层上发生摩擦愈合和诱导地震
Meng Li1, Andre R Niemeijer2, Ylona van Dinther2
1Department of Earth Sciences, Utrecht University, Utrecht, Netherlands. limeng.uni@gmail.com.
Nature communications
|October 15, 2025
概括
与普遍认为的相反,因滑动而加强的断层仍然可以因地质愈合而引发地震. 这种愈合过程在很长一段时间内增加了断层强度,使得地震核形成并改变了地震危险评估.
科学领域:
- 地质物理学 地质物理学
- 地震科学 地震科学 地震科学
- 故障机械学 故障机械学
背景情况:
- 传统模型认为,增强速度的断层会抵抗地震核形成,因为它们会随着滑动而增加摩擦强度.
- 然而,这些名义上是稳定的断层被观察到是人类引起的地震的主机,创造了一个科学矛盾.
研究的目的:
- 解决常规断层模型与在增速断层上观察到的地震行为之间的矛盾.
- 研究地质治愈在这些断层上的地震核形成中的作用.
主要方法:
- 数字建模模拟地质和地震时间尺度.
- 速度和状态摩擦定律的应用,以建模故障行为.
- 断层强度演变和地震核化过程的分析.
主要成果:
- 断层可以通过治愈在地质时间尺度上获得显著的接口强度 (静态摩擦增加0.25).
- 这种愈合使得增强速度的断层能够形成地震的核心,表现出高效的摩擦减弱.
- 随后的地震危险降低了,邻近的部分阻碍了破裂的传播,降低了应力下降.
结论:
- 地质治愈允许增强速度的断层成为地震的主机,挑战现有的范式.
- 在这些断层上诱导的地震性需要修订核化模型和危险评估.
- 了解治愈对于地下能源应用和公众信心至关重要.
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