التفاصيل البيبلوغرافية
| العنوان: |
Similarities and Differences Between Natural and Simulated Slow Earthquakes. |
| المؤلفون: |
Gualandi, A., Dal Zilio, L., Faranda, D., Mengaldo, G. |
| المصدر: |
Geophysical Research Letters; 7/28/2024, Vol. 51 Issue 14, p1-10, 10p |
| مصطلحات موضوعية: |
SLOW earthquakes, GLOBAL Positioning System, NONLINEAR dynamical systems, PALEOSEISMOLOGY, LOADING & unloading |
| مستخلص: |
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. Plain Language Summary: Earthquakes are natural phenomena resulting from the Earth's crust cyclically loading and unloading. The unpredictability of seismic events, combined with the large energy they release during the co‐seismic phase, poses not only scientific challenges but also significant threats to numerous populated regions at risk. Numerical simulations of the seismic cycle are widely used to better understand the dynamics of this natural phenomenon. Nonetheless, a direct comparison of earthquake observations and numerical simulations of the seismic cycle is currently prevented by the lengthy recurrence time of large seismic events rupturing the same fault segment and the short observational record at our disposal. Slow earthquakes, exhibiting lower recurrence times, serve as a viable alternative for validating models against real‐world observations. We investigate similarities and differences between natural and simulated slow earthquakes through the lens of nonlinear dynamical system theory. We study the effects of observational noise and spatio‐temporal coarsening putting the simulations in conditions like real‐world observations. We find that observational noise does not suffice to explain the higher complexity retrieved for natural observations. By refining our understanding of these dynamical systems, this study contributes to advancements in seismic research, offering a picture of the complexities involved on active faults. Key Points: Natural observations and numerical simulations of slow earthquakes share common average dynamical propertiesNatural observations show higher complexity than numerical simulationsMatching instantaneous dynamical properties can help reducing the discrepancies between natural and simulated slow earthquakes [ABSTRACT FROM AUTHOR] |
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