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Home  /  SCEC Workshops  /  California Community Models for Seismic Hazard Assessments Workshop

Do you have models or datasets that may contribute to seismic hazard assessments for California?

Complete this short survey to share your information on existing models and datasets that could be valuable inclusions to the California community models effort.

Your survey input by February 29th will shape workshop discussions.

Conveners: Brad AagaardMarine Denolle, Eric Fielding, Evan Hirakawa, Tran Huynh, Lorraine Hwang, Scott Marshall, Sarah Minson, Laurent Montesi, Arben Pitarka, Judy Zachariasen
Dates: March 4-5, 2024
Location: Online via Zoom

SUMMARY: With funding from NSF, USGS and other sponsors, the Southern California Earthquake Center has transitioned to become the Statewide California Earthquake Center (SCEC). This creates exciting research and collaboration opportunities that span the entire transform plate boundary, encompassing the Pacific and North American Plates from western Nevada to Baja California and Cape Mendocino.

SCEC, USGS, CGS, NASA, LLNL, CIG, and other academic partners invite you to an online workshop March 4-5, 2024 focused on developing “community models” for seismic hazard assessments in California. These community models integrate knowledge and describe a wide range of features in the California lithosphere and asthenosphere that influence seismic activity. These community earth models (CEMs) include: geologic models, fault models, rheology and thermal models, stress models, seismic velocity models, geodetic models and more. Our goal is to develop a robust and self-consistent suite of models for California usable by diverse experts to simulate seismic phenomena.

At the upcoming workshop, we'll explore use cases for California community models, assess existing models and datasets along the San Andreas Fault System, and identify areas for improvement and future collaborative research efforts. Our vision is to refine and merge regional models, ultimately creating internally-consistent, best-available models of the entire San Andreas Fault System.

Whether you're already invested or just curious, we welcome your participation! Join us in mapping a path towards statewide Community Earth Models for California.

Presentation slides may be downloaded by clicking the links following the title. PLEASE NOTE: Files are the author’s property. They may contain unpublished or preliminary information and should only be used while viewing the talk. Only the presentations for which SCEC has received permission to post publicly are included below.

All times Pacific Time

08:00 - 08:15 Introduction (PDF, 1.8MB) Brad Aagaard 
  Use cases for California community models  
08:15 - 08:35 What scientific questions could we address with statewide community models?  Alice Gabriel
08:35 - 08:45 Discussion  
08:45 - 09:05 How could statewide community models improve seismic hazard assessments? Christine Goulet
09:05 - 09:15 Discussion  
09:15 - 09:35 How could carbon sequestration in California use community models? (PDF, 3.2MB) Dan Boyd
09:35 - 09:45 Discussion  
09:45 - 10:00 Break  
  Overview and inventory of existing community models   
10:00 - 10:10 Geologic models (PDF, 4.9MB) Russ Graymer / Mike Oskin
10:10 - 10:20 Fault models (PDF, 6.4MB) Scott Marshall / Alex Hatem
10:20 - 10:30 Rheology and thermal models (PDF, 9.0MB) Laurent Montesi / Wayne Thatcher
10:30 - 10:40 Stress models (PDF, 2.7MB) Jeanne Hardebeck / Karen Luttrell
10:40 - 10:50 Seismic velocity models Evan Hirakawa / Brad Aagaard  
10:50 - 11:00 Geodetic models (PDF, 2.7MB)
11:00 - 11:30 Discussion  
11:30 Adjourn until tomorrow  

All times Pacific Time

08:00 - 08:20 Community models in the Cascadia Region Earthquake Science Center (CRESCENT) (PDF, 3.2MB) Amanda Thomas
08:20 - 08:30 Discussion  
08:30 - 08:45 Breakouts: What does “community” in “community models” mean?
  1. What are the critical traits for a “community model” to be useful?
  2. What are the various roles people have in creating, maintaining, and using a “community model”?
  3. What are important factors for improving “community models”?
  4. How do we identify, communicate with, and involve community members?
All participants, are assigned and divided into the 13 Breakout Groups listed below.
08:45 - 09:15 Breakout Group Reports (1 slide each, 2-minutes per group) Breakout Group Leaders
09:15 - 09:30 Break  
  Techniques for integrating and embedding models   
09:30 - 09:40 Data integration: Geodetic models from GNSS + InSAR (PDF, 1.9MB) Mike Floyd / Katia Tymofyeyeva
09:40 - 09:50 Seamless embedding of seismic velocity models via integrated geologic models (PDF, 3.2MB) Brad Aagaard
09:50 - 10:00 Embedding high resolution models in regional models using blending (PDF, 2.5MB) Patricia Persaud
10:00 - 10:10 Embedding high resolution models in regional models using machine learning (PDF, 6.0MB) Yehuda Ben-Zion
10:10 - 10:20 Discussion  
10:20 - 10:40 Plenary discussion: Incentives for participating in community models  
10:40 - 11:00 Wrap-up discussion: Looking ahead  
11:00 Adjourn  


It is SCEC policy to foster harassment-free environments wherever our science is conducted. By accepting an invitation to participate in a SCEC-supported event, by email or online registration, participants agree to abide by the SCEC Activities Code of Conduct.


Breakout Group 1

Julian Lozos (CSUN)
Scott Marshall (AppState)
Rachel Abercrombie (Boston U)
Daniel Boyd (CGS)
Jianhua Gong (Indiana U)
Bill Hammond (UNR)
Yangfan Huang (U Oxford)
Han Kim (Parsons)
Jaehwi Kim (Changwon National U)
Yuexin Li (Caltech)
Donald Medwedeff (Independent)
craig nicholson (UCSB)
Bar Oryan (UCSD)
Patricia Persaud (U Arizona)
Sandra Razafimamonjy (IOGA)
Angela Stallone (INGV)
Joann Stock (Caltech)
Jessica Velasquez (Moody's RMS)
Alan Yong (USGS)

Breakout Group 2

Breakout Group 3

Breakout Group 4

Breakout Group 5

Kathryn Materna (U Colorado)
Laurent Montesi (U Maryland)
Linda Alatik (Linda Alatik Consulting)
Luciana Astiz (NSF)
Yehuda Ben-Zion (USC)
Robert Clayton (Caltech)
Alex Grant (USGS)
Suzanne Hecker (USGS)
Chun-Yu Ke (Pennsylvania State U)
Evan Marschall (UC Riverside)
Evans Onyango (U Alaska Fairbanks)
Kathleen Steinbroner (CEA)
Karen SUNG (UC Berkeley)
Kirk Townsend (CGS)
Russ Van Dissen (GNS Science)
倩茹 王 (Donghua University)
Renyi Xu (
Donghua University)

Breakout Group 6

Breakout Group 7

Breakout Group 8

Breakout Group 9

Marine Denolle (U Washington)
Hao Guo (U Wisconsin-Madison)
Titi Anggono (NRIA, Indonesia)
Ashly Cabas (North Carolina State U)
Anindita Dash (Rice U)
Eric Dittmer (Dittmer Consulting)
Russell Graymer (USGS)
Javier Ojeda (U de Chile & IPGP)
Manitriniaina Ravoson (IOGA)
Emel Seyhan (Moodys RMS)
Brian Swanson (CGS)
Mei-Hui Su (SCEC)
Wayne Thatcher (USGS)
Molly Zebker (U Texas at Austin)

Breakout Group 10

Breakout Group 11

Breakout Group 12

Breakout Group 13

Eric Fielding (JPL)
Niloufar Abolfathian (OAI)
Esam Abraham (USC)
James Conrad (USGS)
Michael DeFrisco (CGS)
Humberto Alfonso García Montano (CIACE, UNAN-Managua)
Eric Geist (USGS)
Lorraine Hwang (UC Davis CIG)
Mike Oskin (UC Davis)
Andriniaina Tahina Rakotoarisoa (IOGA, Madagascar)
Tsiriandrimanana Rakotondraibe (IOGA)
Andry Mampionona Ramarolahy (IOGA)
Cliff Thurber (U Wisconsin-Madison)
Michael Turner (CEC)