We investigate similarities and differences between natural and simulated slow earthquakes using nonlinear dynamical system tools. We use spatio-temporal slip potency rate data derived from Global Navigation Satellite System (GNSS) position time series in the Cascadia subduction zone and numerical simulations intended to reproduce their pulse-like behavior and scaling laws. We provide metrics to evaluate the accuracy of simulations in mimicking slow earthquake dynamics. We investigate the influence of spatio-temporal coarsening as well as observational noise. Despite the use of many degrees of freedom, numerical simulations display a surprisingly low average dimension, akin to natural slow earthquakes. Instantaneous dynamical indices can reach large values (>10) instead, and differences persist between numerical simulations and natural observations. We propose to use the suggested metrics as an additional tool to narrow the divergence between slow earthquake observations and dynamical simulations.

中文翻译：

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自然慢地震和模拟慢地震之间的异同


我们使用非线性动力系统工具研究自然慢地震和模拟慢地震之间的异同。我们使用来自卡斯卡迪亚俯冲带全球导航卫星系统（GNSS）位置时间序列的时空滑移效力率数据和数值模拟，旨在重现其脉冲状行为和缩放定律。我们提供指标来评估模拟慢地震动力学模拟的准确性。我们研究了时空粗化以及观测噪声的影响。尽管使用了许多自由度，数值模拟显示出惊人的低平均维度，类似于自然慢地震。相反，瞬时动力指数可以达到很大的值（>10），并且数值模拟和自然观测之间仍然存在差异。我们建议使用建议的指标作为附加工具来缩小慢地震观测和动力学模拟之间的差异。