Dynamic Rupture Workshop Report: Improving our Understanding of Fault Friction

Ruth A. Harris, & Michael J. Barall

Published February 24, 2026, SCEC Contribution #15055

On December 2, 2025, we convened in Zoom the Statewide California Earthquake Center’s (SCEC) Dynamic Rupture Technical Activity Group (TAG) workshop “A Dynamic Rupture Workshop to Improve our Understanding of Fault Friction”. 94 people participated, in addition to three more people who sent pre-recorded talks but were unable to join us in Zoom that day. More than one-half of our workshop participants were students or postdocs, and the group included scientists from institutions in 14 countries (USA, Canada, China, Czech Republic, France, Germany, Israel, India, Italy, Japan, Mexico, New Zealand, Pakistan, Switzerland). Our workshop included 27 talks along with many opportunities for discussion.

The focus of this year’s workshop was coseismic fault friction. Our codes can implement many friction constitutive relations, but determining which friction framework is most appropriate for real faults remains unsolved. With this workshop, we heard the newest thinking about coseismic friction mechanisms in general, as well as detailed observational evidence. In addition, the overviews from related SCEC groups described those groups’ recent accomplishments, and the lightning talks, which were offered as an opportunity to every workshop registrant, highlighted a range of new results related to dynamic rupture simulations.

Citation
Harris, R. A., & Barall, M. J. (2026). Dynamic Rupture Workshop Report: Improving our Understanding of Fault Friction. , : Statewide California Earthquake Center. https://www.scec.org/events/2025-scec-dynamic-rupture-workshop/