Motuzas Charlotte A, Shcherbakov Robert
Department of Earth Sciences, Western University, London, ON N6A 5B7, Canada.
Department of Physics and Astronomy, Western University, London, ON N6A 3K7, Canada.
Entropy (Basel). 2023 Oct 6;25(10):1419. doi: 10.3390/e25101419.
In this work, a model is proposed to examine the role of viscoelasticity in the generation of simulated earthquake-like events. This model serves to investigate how nonlinear processes in the Earth's crust affect the triggering and decay patterns of earthquake sequences. These synthetic earthquake events are numerically simulated using a slider-block model containing viscoelastic standard linear solid (SLS) elements to reproduce the dynamics of an earthquake fault. The simulated system exhibits elements of self-organized criticality, and results in the generation of avalanches that behave similarly to naturally occurring seismic events. The model behavior is analyzed using the Epidemic-Type Aftershock Sequence (ETAS) model, which suitably represents the observed triggering and decay patterns; however, parameter estimates deviate from those resulting from natural aftershock sequences. Simulated aftershock sequences from this model are characterized by slightly larger -values, indicating a faster-than-normal decay of aftershock rates within the system. The ETAS fit, along with realistic simulated frequency-size distributions, supports the inclusion of viscoelastic rheology to model the seismogenic fault dynamics.
在这项工作中，提出了一个模型来研究粘弹性在模拟类地震事件产生中的作用。该模型用于研究地壳中的非线性过程如何影响地震序列的触发和衰减模式。这些合成地震事件通过使用包含粘弹性标准线性固体（SLS）元件的滑块模型进行数值模拟，以再现地震断层的动力学。模拟系统表现出自组织临界性的特征，并导致产生与自然发生的地震事件行为相似的雪崩。使用流行型余震序列（ETAS）模型分析模型行为，该模型恰当地代表了观测到的触发和衰减模式；然而，参数估计与自然余震序列的结果有所偏差。该模型模拟的余震序列的特征是值略大，表明系统内余震速率的衰减比正常情况快。ETAS拟合以及逼真的模拟频率-大小分布支持纳入粘弹性流变学来模拟地震成因断层动力学。
