We are grateful to the associate editor, H. Chauris, and the reviewers, I. Ravve and E. Iversen for constructive comments that help improve the paper. We thank E. Blias and I. Vasconcelos for helpful discussions. We thank the sponsors of the Texas Consortium for Computational Seismology (TCCS) and the Rock Seismic Research Project (ROSE) for financial support. The first author was additionally supported by the Statoil Fellows Program at the University of Texas at Austin.
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