Finally, additional hydrothermal synthesis experiments examining the detailed kinetics of quartz cementation at conditions reflective of the earthquake-producing crust would likely be informative.— Randolph T. Williams (rtwilliams@wisc.edu; 0000-0002-1160-8842), University of Wisconsin–Madison, USA; and Åke Fagereng (0000-0001-6335-8534), Cardiff University, UK
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