SUMMARY: Starting in 2018, the SCEC Dynamic Rupture Group began a detailed examination of the essential ingredients needed to understand earthquakes and produce viable large-earthquake source simulations. We first focused on fault geometry at the 2018 workshop. In this next workshop of the series, we will focus on fault friction. We have invited speakers from both outside and inside our group to present their ideas about the nature of fault zone friction, what it looks like in the Earth, and how our choices for fault-zone friction in our computational models affect rupture extent and ground shaking.

Questions we hope to answer in this fault friction workshop include:

1. Based on field or lab observations, can we can rule out any formerly proposed coseismic fault-friction mechanisms?

2. How might viable fault-friction mechanisms affect the resulting fault slip, fault slip-rates, and ground shaking?

3. For viable fault friction mechanisms, do we need to incorporate all of their features when computationally simulating dynamic earthquake rupture, or can the friction part of our dynamic rupture calculations be simplified?

Presentation slides may be downloaded by clicking the links below. PLEASE NOTE: Files are the author’s property. They may contain unpublished or preliminary information and should only be used while viewing the talk.