FM: Ice friction and healing under dynamic loading conditions
Christine McCarthy, Lamont Doherty Earth Observatory of Columbia University
Antarctic ice streams that exhibit stick-slip events sufficient to generate seismic waves are demonstrating velocity weakening behavior as defined by rate- and state- dependent friction. Healing between events is a necessary condition of stick-slip. We have conducted laboratory experiments to better constrain healing and frictional stability in a simplified ice-on rock system, quantifying the relevant parameters via velocity steps and slide-hold-slides. In particular, we measure healing rates that are orders of magnitude greater than typically measured in rock friction experiments. Additionally, oscillatory velocities were used to explore the role of tidal modulation on friction and healing and rate-state values obtained can be used to forward model to dynamic systems.
|When:||Friday 31 March, 2023, 1:00 pm - 2:00 pm PDT|