Laboratory observations of fluid pressure and fault dilatancy controlling earthquake instability

Brian D Kilgore1, Brooks Proctor2, David A Lockner1, Thomas M Mitchell3 and Nicholas M Beeler4, (1)USGS Earthquake Science Center, Menlo Park, CA, United States, (2)Brown University, Geology, Providence, RI, United States, (3)University College London, Department of Earth Sciences, London, United Kingdom, (4)USGS Cascades Volcano Observatory, Vancouver, WA, United States