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SCEC Dynamic Rupture Group Ingredients Workshop on Fault Friction

Conveners: Ruth Harris and Michael Barall
Dates:  January 8, 2020 (09:00-17:30)
Location: Kellogg West Conference Center, Pomona, CA
SCEC Award and Report: 19121

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 They may contain unpublished or preliminary information and should only be used while viewing the talk.


08:30 - 09:00 Workshop Check-In  
09:00 - 09:20 Welcome, Overview of Workshop Objectives, and Participant Introductions Ruth Harris
  Session 1: Views of Coseismic Friction, from the Lab and the Field  
09:20 - 09:45 Overview: Friction in the lab and field (PDF, 1.2MB) Fred Chester
09:45 - 10:05 Thermal pressurization in laboratory experiments (PDF, 1.3MB) Nir Badt
10:05 - 10:25 Insights from deep drilling - case studies (PDF, 3.5MB) Tamara Jeppson
10:25 - 10:45 Discussion All
10:45 - 11:00 Break  
11:00 - 11:20 The frictional strength of fault rocks before, during, and following earthquakes: Insights from the field and experiments (PDF, 6.4MB) Noah Phillips (McGill)
11:20 - 11:40 Recent lab observations concerning stability of hydraulically isolated faults David Lockner
11:40 - 12:00 Discussion  
12:00 - 13:00 Lunch  
  Session 2: Views of Coseismic Friction, from the Lab, Field, and Modeling  
13:10 - 13:30 Constraining physical conditions for the low-stress, low-heat operation of mature faults Valere Lambert
13:30 - 13:50 Probing frictional properties on seismogenic faults with constraints from near-field data (PDF, 2.3MB) Hongfeng Yang
13:50 - 14:15 Update - Dynamic Rupture Code Validation Project Kyle Withers / Yongfei Wang
  Update - Surface Rupture Project (PDF, 1.3MB) Christine Goulet
14:15 - 15:10 Discussion All
15:10 - 15:30 Break  
  Session 3: Dynamic Rupture Simulations and Friction - Current Practice  
15:30 - 15:55 Overview: Friction Currently used in Dynamic Rupture Computational Simulations (PDF, 2.2MB) Eric Dunham
15:55 - 16:15 Friction law and level matter in dynamic ruptures of earthquake gates (PDF, 5.9MB) Ben Duan
16:15 -16:35 Dynamic rupture simulations of recent earthquakes Alice Gabriel
16:35 - 17:30 Discussion All
17:30 Workshop Adjourns  


*Remote Participants

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