Fluid‐induced earthquake sequences generally appear as expanding swarms activating a particular fault. The recent analysis of a swarm in the Corinth rift has revealed a dual migration pattern, with a global slow expansion (m day⁻¹) and episodes of rapid migration (km day⁻¹). Such swarms are generally interpreted as fluid diffusion, which ignores the possibility of static, dynamic, or aseismic triggering and the existence of rapid migration. Here, we propose a new model for such swarms, where earthquakes consist in the failure of asperities on a creeping fault infiltrated by fluid. For that, we couple rate‐and‐state friction, nonlinear diffusivity, and elasticity along a 1D interface. This model reproduces the dual migration speeds observed in real swarms. We show that migration speeds increase linearly with the mean pressurization and are not dependent on the hydraulic diffusivity, as traditionally suggested.

中文翻译：

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地震群中的双重地震迁移速度

流体诱发的地震序列通常表现为不断扩大的群群激活了特定的断层。最近对科林斯裂谷群的分析显示出双重迁移模式，全球缓慢扩张（m天^-1），快速迁移事件（公里第^-1天））。这些群通常被解释为流体扩散，它忽略了静态，动态或抗震触发的可能性以及快速迁移的存在。在这里，我们提出了一种针对此类群的新模型，其中地震包括由流体渗透的蠕动断层上的粗糙破坏。为此，我们沿一维界面耦合了速率和状态摩擦，非线性扩散率和弹性。该模型重现了在真实群中观察到的双重迁移速度。我们表明，迁移速度随着平均压力的增加而线性增加，并且不依赖于传统的水力扩散系数。