2025 SCEC CRM Workshop

Integrating friction into the Community Rheology Model

Date: September 6, 2025
Location: Palm Springs Hilton
Workshop Organizers: Alexis Ault (Utah State), Sylvain Barbot (USC), Caroline Seyler (USC)
SCEC Award: 25133

APPLICATION DUE: July 31, 2025
Attendance is limited to 30 in-person participants. The accepted participant list will be finalized by August 8, 2025. 

Overview

The Community Rheology Model (CRM) is a foundational Community Earth Model (CEM) but, to date, is underdeveloped because it does not include brittle rheology. On- and off-fault frictional properties within and above the seismogenic zone are critical components of quasi-static and dynamic rupture simulations and probabilistic earthquake hazard forecasts for the state of California. In this pre-SCEC Annual Meeting Workshop we aim to take an important step in filling this critical data gap by creating a FAIR compliant database or repository for georeferenced frictional properties over a range of conditions (e.g., lithology (on- and off-fault, host rock), depth, temperature, fluid conditions, fabric) from across California nested within the CEM framework.

We will bring together stakeholders from the experimental/rock mechanics, earthquake geology, geophysics, and computational communities including the next generation of SCEC researchers to (1) design a new frictional database, (2) pinpoint persistent unknowns in the context of the statewide mission that advance the CRM, and (3) strategize and advocate for the CRM, the importance of rheology in future SCEC science, and the intersectionality of SCEC and CRESCENT through rheology-based toolboxes and science.

We welcome applications from individuals involved in experimental/rock mechanics, earthquake geology, geophysics, and computational communities. We especially encourage participation from students, postdocs, and early career scientists. Capacity is limited to 30 in-person participants, selected based on their statement of interest and the potential of their contributions.

September 6, 2025

All times are Pacific Daylight Time (UTC-7). 

TimeAgenda ItemSpeaker
09:00 - 10:00

Coffee, breakfast, check-in

10:00 - 10:15Welcome and workshop goalsAlexis Ault, Sylvain Barbot, Caroline Seyler
10:15 - 10:30State of the CRM and CEM interfaceLaurent Montesi
Session 1: Building a Frictional Database for California
Moderator: Caroline Seyler
10:30 - 10:35IntroductionCaroline Seyler
10:35 - 10:55Impact of heterogeneity on fault friction in space and timeSrisharan Shreedharan
10:55 - 11:15Microphysical controls on frictional behaviorKristina Okamoto
11:15 - 11:45Breakout Group Brainstorm #1 – Lithologies, data, and metadata for database
11:45 - 12:05Group Read-outs and Compilation
12:05 - 13:00Lunch
13:00 - 13:05Developing constitutive lawsSylvain Barbot
13:05 - 13:30Breakout Group Brainstorm #2 (new groups) – “Futurecasting the CRM,” how can the CRM serve future constitutive relationships?
13:30 - 13:50Group Read-outs and Compilation
13:50 - 14:10Group Discussion - What’s missing and what is needed?

Session 2: SCEC Science – Outstanding Questions & Role of Rheology
Moderator: Sylvain Barbot

14:10 - 14:15IntroductionSylvain Barbot
14:15 - 14:35Fault rheology from field to labJosie Nevitt
14:35 - 14:55New methods in measuring brittle deformationMatěj Pěc
14:55 - 15:15Group Discussion
Lightning talk session + Coffee Break
15:15 - 15:30Coffee Break
15:30 - 16:00Lightning talks for rheology posters at SCEC
Simulating Earthquake Cycles with Lab-derived, Physics-based FrictionBinhao Wang
Effects of roughness on fault friction from slow to fast velocitiesMonica Barbery
Probing Frictional Fault Properties From Tidal and Hydrological Seismicity ModulationsRoland Bürgmann
Evolution of fault properties at geothermal conditionsTamara Jeppson
Impacts of hydrothermal alteration on spatiotemporal evolution of fault zone propertiesZachary Smith
Emergent Bimaterial Slip Zones Control Strain Localization and Off-Fault Deformation along Plate Boundary Faults, Death Valley, CaliforniaFolarin Kolawole
Creep experiments results of the SAF damage zone rocks and their viscoplastic propertiesNairong Du
Fault zone healing: time-dependent rheology changesChristie Rowe
Viscoplastic rheology for characterizing the bulk rheology of fault zone rocks.Hiroki Sone
Geological and Frictional Characterization of Damage Zone Structure of the Southern San Andreas Fault at Ferrum and Implications for Coseismic Off-Fault DeformationAshley Griffith
Frictional properties and K-Ar geochronology reveal a multi-million year history of earthquakes and slow slip events in the southern San Andreas fault gougeAlexandra DiMonte
What do we really know about friction of natural gouges?Heather Savage
Session 3: Advocating for Rheology in the Future of SCEC
Moderator: Alexis Ault
16:00 - 16:05IntroductionAlexis Ault
16:05 - 16:10Comments from SCEC Director Designate Ahmed ElbannaAhmed Elbanna
16:10 - 16:35The future of rheology in SCEC and bridging SCEC and CRESCENTCailey Condit & Greg Hirth
16:35 - 16:45Group Discussion
Wrap-up and Next Steps
16:45 - 17:00Summary and closing remarksAlexis Ault, Sylvain Barbot,Caroline Seyler
17:00Workshop Adjourns

Participants

Last NameFirst NameOrganization
AultAlexisUSU
BarberyMonicaBrown
BarbotSylvainUSC
BürgmannRolandUC Berkeley
CebrySaraUSGS
ConditCaileyUW
DiMonteAlexandraUSU
DuNairongU Wisconsin
ElbannaAhmedUSC
GriffithAshleyOhio State
HirthGregBrown
JeppsonTamaraUSGS
KolawoleFolarinColumbia
KroghJuliaUC Santa Cruz
KrugerIleneUC Santa Cruz
LeeTerryUNR
MaddenElizabethSan Jose State
MontesiLaurentU Maryland
NevittJosieUSGS
OkamotoKristinaU Minnesota
PečMatějMIT
Pinilla RamosCamilo IgnacioUSC/SCEC
RoweChristieUNR
SavageHeatherUC Santa Cruz
SeylerCarolineUSC
ShreedharanSrisharanUSU
SmithZacharyUC Berkeley
SoneHirokiU Wisconsin
TullisTerryBrown
VashishthaMradulaStony Brook
WangBinhaoUSC
WickenhauserOtisUC Santa Cruz

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