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Revisiting the tidal activation of seismicity with a damage mechanics and friction point of view

机译：从损伤力学和摩擦学角度重新审视潮汐地震活动

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The Load Unload Response Ratio theory (LURR) puts forward the idea that the ratio of seismicity during times of increased tidal loading to times of decreased tidal loading takes on anomalously large values as the preparatory region of the earthquake approaches a critical state. We repeated the calculations of LURR for several earthquakes in California, for which results had been published, using estimates of the parameters which could be determined from the published work. We were unable to confirm any LURR ratio predictive significance.We test an alternative method of evaluating the influence of tidal stresses on earthquakes based on damage mechanics. As in rock mechanics experiments, it may be that anomalous activation of seismicity prior to large earthquakes occurs only during those time intervals when the applied stress exceeds values previously attained. We applied this approach to analyze the same data set used to test the LURR hypothesis, and it also failed to reveal any significant precursory indications. It may be that time-dependent failure processes such as self-driven nucleation occur on a time scale longer than the diurnal tide, thus destroying the expected synchronization.
机译：荷载卸载响应比理论（LURR）提出了这样的思想，即当地震的预备区域接近临界状态时，潮汐载荷增加期间的地震活动度与潮汐载荷减少期间的活动度之比异常大。我们使用可以从已发表的工作中确定的参数估计值，对已发布结果的加利福尼亚州的几次地震重复进行LURR计算。我们无法确定任何LURR比率的预测意义。我们测试了一种基于破坏力学评估潮汐应力对地震影响的替代方法。如岩石力学实验中那样，可能是大地震之前地震活动的异常激活仅在施加应力超过先前获得的值的那些时间间隔内发生。我们采用了这种方法来分析用于检验LURR假设的相同数据集，并且它也未能揭示任何重要的先兆迹象。可能是与时间有关的故障过程（例如自驱动成核）的发生时间长于昼夜潮，从而破坏了预期的同步。

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