Micro-crack density, porosity, and permeability in fault damage zones play an important role in the pore fluid diffusion process. During long-term earthquake cycles, those properties change with time as a result of either physical damage or chemical/physical healing. Hence, the evolution of permeability can affect the recurrence of earthquakes by either delaying or accelerating the weakening of the fault core through controlling the pore pressure distribution and changing the effective normal stress. In this study, we use a single degree of freedom spring slider analog fault model to simulate the earthquake sequences, considering permeability as a decreasing function of the effective normal stress and thus an increasing function of pore pressure; we also examine its evolution resulting from coseismic damage and interseismic healing. Our simulation results show that different permeability evolution, controlled by various physical conditions, could result in a variety of fault slipping histories, which demonstrates the importance of incorporating the permeability evolution into earthquake modeling, especially when assessing the long-term effects.

中文翻译：

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断层损伤带渗透率演化对地震复发的影响

断层损伤带的微裂缝密度、孔隙度和渗透率在孔隙流体扩散过程中起着重要作用。在长期的地震周期中，由于物理损坏或化学/物理愈合，这些特性会随时间发生变化。因此，渗透率的演变可以通过控制孔隙压力分布和改变有效正应力来延迟或加速断层核的弱化，从而影响地震的复发。在这项研究中，我们使用单自由度弹簧滑块模拟断层模型来模拟地震序列，将渗透率视为有效正应力的递减函数，因此是孔隙压力的增函数；我们还研究了由同震破坏和震间愈合引起的演变。