Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 117, Issue 35, Pages 21095-21100Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2004590117
Keywords
dynamic friction; laboratory earthquakes; thrust faults
Categories
Funding
- NSF [EAR1651235, EAR-1033462]
- US Geological Survey (USGS) [G20AP00037]
- Caltech/Mechanical and Civil Engineering Big Idea Fund (2019)
- Caltech's Division of Geological and Planetary Sciences
- Southern California Earthquake Center (SCEC) [19093]
- USGS [G12AC20038]
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Large, destructive earthquakes often propagate along thrust faults including megathrusts. The asymmetric interaction of thrust earthquake ruptures with the free surface leads to sudden variations in fault-normal stress, which affect fault friction. Here, we present full-field experimental measurements of displacements, particle velocities, and stresses that characterize the rupture interaction with the free surface, including the large normal stress reductions. We take advantage of these measurements to investigate the dependence of dynamic friction on transient changes in normal stress, demonstrate that the shear frictional resistance exhibits a significant lag in response to such normal stress variations, and identify a predictive frictional formulation that captures this effect. Properly accounting for this delay is important for simulations of fault slip, ground motion, and associated tsunami excitation.
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