Analysis of normal stress stepping experiments indicates that friction evolution depends on contact area quality rather than quantity

Terry E Tullis1, Pathikrit Bhattacharya2, Allan M Rubin3, Nir Badt1 and Nicholas M Beeler4, (1)Brown University, DEEPS, Providence, RI, United States, (2)Indian Institute of Technology Bhubaneswar, School of Earth, Ocean and Climate Sciences, Bhubaneswar, India, (3)Princeton University, Princeton, NJ, United States, (4)USGS Cascades Volcano Observatory, Vancouver, WA, United States