\section{Acknowledgments}
The authors would like to acknowledge G. Fabien-Ouellet for providing the GPU-accelerated viscoelastic finite-difference time-domain code. Financial support was provided by a research grant from the Qu\'ebec Ministry of Sustainable Development, Environment, Fauna and Parks and the Canada Research Chair in Assimilation of Geological and Geophysical Data for Stochastic Geological Modeling.
    
  