Tidal triggering of tectonic tremors has been observed at plate boundaries around the circum-Pacific region. It has been reported that the response of tremors to tidal stress during episodic tremor and slow slip (ETS) changes between the early and later stages of ETS. Several physical models have been constructed, with which observations for the tidal response during ETS have been partly reproduced. However, no model has been proposed that reproduces all the observations. In this study, a model adopted in previous studies is extended to include the effects of dilatancy/compaction that occur in the fault creep region. The analytical approximate solution derived in this study and numerical computational results reveal how the tidal response depends on the physical properties of the fault. Furthermore, the model reproduces all the above observations simultaneously for a specific range of fault parameters. Of particular importance is that the occurrence of dilatancy/compaction is essential to reproduce the tidal response at the early stage of the ETS. The value of the critical distance is constrained to be approximately . This agrees with the values that have been widely used in seismic cycle numerical simulations rather than those obtained in laboratory experiments. The fluid pressure diffusivity is constrained to be at least or less, and the effective normal stress is constrained to . In conclusion, this study shows that reproducing the tidal response of tectonic tremors during the ETS is useful for estimating fault physical properties, including hydraulic properties.

中文翻译：

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考虑剪胀/压实的潮汐响应模型约束的板界面的摩擦和水力特性

在环太平洋地区的板块边界已经观察到潮汐触发的构造震颤。据报道，发作性震颤和慢滑（ETS）期间震颤对潮汐应力的反应在ETS的早期和晚期之间发生变化。已经构建了几个物理模型，其中部分再现了 ETS 期间潮汐响应的观测结果。然而，还没有提出可以重现所有观察结果的模型。在本研究中，将先前研究中采用的模型扩展到包括断层蠕变区域中发生的剪胀/压实效应。本研究得出的解析近似解和数值计算结果揭示了潮汐响应如何取决于断层的物理特性。此外，该模型针对特定范围的故障参数同时再现所有上述观察结果。特别重要的是，膨胀/压实的发生对于再现 ETS 早期的潮汐响应至关重要。临界距离值被约束为大约。这与地震周期数值模拟中广泛使用的值一致，而不是在实验室实验中获得的值。流体压力扩散率被限制为至少或更少，有效正应力被限制为。总之，这项研究表明，再现 ETS 期间构造震动的潮汐响应对于估计断层物理特性（包括水力特性）是有用的。