Harbord, C;
Brantut, N;
Spagnuolo, E;
Di Toro, G;
(2021)
Fault Friction During Simulated Seismic Slip Pulses.
JGR: Solid Earth
, 126
(8)
, Article e2021JB022149. 10.1029/2021JB022149.
Preview |
Text
2021JB022149.pdf - Published Version Download (1MB) | Preview |
Abstract
Theoretical studies predict that during earthquake rupture faults slide at non-constant slip velocity, however it is not clear which source time functions are compatible with the high velocity rheology of earthquake faults. Here we present results from high velocity friction experiments with non-constant velocity history, employing a well-known seismic source solution compatible with earthquake source kinematics. The evolution of friction in experiments shows a strong dependence on the applied slip history, and parameters relevant to the energetics of faulting scale with the impulsiveness of the applied slip function. When comparing constitutive models of strength against our experimental results we demonstrate that the evolution of fault strength is directly controlled by the temperature evolution on and off the fault. Flash heating predicts weakening behavior at short timescales, but at larger timescales strength is better predicted by a viscous creep rheology. We use a steady-state slip pulse to test the compatibility of our strength measurements at imposed slip rate history with the stress predicted from elastodynamic equilibrium. Whilst some compatibility is observed, the strength evolution indicates that slip acceleration and deceleration might be more rapid than that imposed in our experiments.
Type: | Article |
---|---|
Title: | Fault Friction During Simulated Seismic Slip Pulses |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1029/2021JB022149 |
Publisher version: | http://dx.doi.org/10.1029/2021JB022149 |
Language: | English |
Additional information: | © 2021. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
Keywords: | FRACTURE ENERGY, EARTHQUAKE, TEMPERATURE, STRESS, SCALE, LEADS, ROCK, TIME, FLOW |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
URI: | https://discovery.ucl.ac.uk/id/eprint/10134227 |
Archive Staff Only
View Item |