2026 SCEC Parkfield 2.0 Workshop

Date: June 10-11, 2026
Location: Moffett Field, CA
Workshop Organizers: Bill Ellsworth, Roland Burgmann, Cliff Thurber, Yihe Huang, Andy Barbour, Nathan Toke
SCEC Award: 26052

Summary

The SCEC Parkfield 2.0 workshop, to be held on June 10-11, 2026 at Moffett Field, California, is focused on the earthquake science opportunities along the San Andreas Fault in the Parkfield region of central California. With its long history of repeating magnitude 6 earthquakes and decades of extensive geophysical and geological research, the Parkfield region presents unique opportunities for deepening our understanding of fault behavior, fault zone structure, and the underlying physics. The full spectrum of fault behavior is on display, and the deep SAFOD borehole also provides unique research opportunities to probe the fault zone at depth.

The workshop will combine oral presentations on background and history, key disciplinary and interdisciplinary research findings and questions, and critical research needs and associated discussion sessions with poster presentations illuminating the breadth of past, current, and potential future research in the region. We expect to emerge from the workshop with an exciting vision for Parkfield science in the future, including a set of well-posed scientific questions that align with the SCEC science plan and that can be addressed through SCEC community activities focused on the Parkfield region.

The workshop organizers want to encourage participation by scientists from a range of career stages and researchers both with and without prior Parkfield-related experience. We seek to bring together individuals with seasoned perspectives from their prior Parkfield research as well as those who can bring new perspectives from research not previously linked to Parkfield. Given the remarkable breadth of scientific opportunities in the Parkfield region, the workshop is expected to spark vigorous, creative investigations by a broad cross-section of SCEC and related researchers.

To foster discussion and interaction, the workshop is expected to convene approximately 50 participants, who will be selected based on their statement of interest and the potential contribution to the workshop objectives.

Accepted participants will be notified by May 4, 2026, with details on registration payments, hotel reservations, and additional travel support if applicable.

Registration Fee

The workshop registration fee is $115 and covers venue costs, as well as meals and breaks listed on the June 10-11 agenda.

Travel Support

Applicants should complete the travel support section carefully as part of the application process. Students, early‑career researchers, and participants without institutional funding are especially encouraged to apply for travel support. Subject to available funding, SCEC travel support may include travel to the workshop venue, lodging and/or meal expenses.

All times below Pacific Standard Time (UTC -7)

Wednesday, June 10, 2026

Time	Agenda Item	Presenter
10:00 - 12:00	Session 1: Introduction to Parkfield and State of Knowledge This opening session sets the stage for the workshop by reviewing the history of Parkfield earthquake research, its role as a natural laboratory on the San Andreas Fault, and the current state of scientific understanding. The session features four invited talks followed by an interactive panel discussion that frames key questions and opportunities for the workshop. Session Chair: Bill Ellsworth
10:00 - 10:15	Introduction	Bill Ellsworth
10:15 - 10:30	Parkfield V1.0: 1985-2004	John Langbein
10:30 - 10:45	Geodetic imaging of earthquake cycles at Parkfield	Jessica Murray
10:45 - 11:00	Geophysical Insights into the 3D Structure of the Parkfield Region	Cliff Thurber
11:00 - 11:15	USGS Instrumentation and Observation Activity at Parkfield: Current Status	Liz Hearn
11:15 - 12:00	Discussion
12:00 - 13:00	Lunch & Poster Session 1 An informal poster session to provide an opportunity for participants to share and explore a broad range of past, ongoing, and future Parkfield‑related research.
13:00 - 14:30	Session 2: Geology and SAFOD Legacy This session focuses on San Andreas Fault geology and structure, spanning the creeping central fault, Parkfield segment and the 1857 rupture. This session also explores insights gained from the San Andreas Fault Observatory at Depth (SAFOD). Five short talks are followed by a moderated discussion on unresolved questions and future directions. Session Chair: Andy Barbour
13:00 - 13:15	Attempts to discriminate between paleoseismic evidence of creep and paleoseismic ruptures along the central San Andreas fault	Nathan Toke
13:15 - 13:30	Do earthquakes rupture through the creeping section of the San Andreas Fault? Evidence from geology	Belle Philibosian
13:30 - 13:45	SAFOD: Lessons Learned, Current Status and Future Possibilities	Steve Hickman
13:45 - 14:00	Parkfield in the lab” what has/can rock mechanics do to address Parkfield’s driving questions	Sara Beth Cebry
14:00 - 14:30	Discussion
14:30 - 15:00	Break & Poster Session 2 A poster session highlighting additional contributions and continued discussion in an informal setting.
15:00 - 16:30	Session 3: Parkfield Earthquakes and Fault Behavior This session examines the full spectrum of fault behavior on display near Parkfield where the central creeping section of the San Andreas fault meets the locked sections of the fault to the south. Since the dawn and sunrise foreshocks leading up to the Great 1857 earthquake there have been five ~M6 events, creep increases from zero to more than 25 mm/a in just over 30 km, and geophysical monitoring has enabled the observation of fascinating patterns of microseismicity and slow slip events. Talks will span observational, theoretical, and modeling perspectives with discussion centered on what the diverse patterns of slip behavior teach us about how faults work over various timescales. Session Chair: Yihe Huang
15:00 - 15:15	Tremor and Low-Frequency Earthquakes at Parkfield: A window into the lower-crustal San Andreas Fault	David Shelly
15:15 - 15:30	Fault creep, surface rupture, and aftership near Parkfield California: past and current phenomena and future possibilities	Steve DeLong
15:30 - 15:45	Revisiting Parkfield Mainshocks: A characteristic Snowflake Model	Sue Hough
15:45 - 16:00	Strong Ground Motion Observations from the CSMIP Parkfield Array: 2004 Data, Comparisons, and Network Evolution	Hamid Haddadi
16:00 - 16:30	Discussion
16:30 - 17:00	Lightning Talks A fast‑paced session highlighting emerging ideas, new datasets, and novel approaches from across the community. Lightning talks are designed to spark discussion, seed collaborations, and showcase perspectives from both established and newer Parkfield researchers. Session Chair: Cliff Thurber
17:00 - 18:30	Dinner & Breakout Session 1: Identifying Grand Challenges Small‑group discussions focused on synthesizing ideas from Day 1 and identifying major scientific challenges and opportunities for Parkfield research. Breakouts emphasize interdisciplinary perspectives and community‑driven prioritization.

Thursday, June 11, 2026

Time	Agenda Item	Presenter
07:00 - 08:30	Breakfast & Poster Session 2 A second poster session highlighting additional contributions and continued discussion in an informal setting.
08:30 - 10:00	Session 4: Geodesy and Earthquake Cycles This session explores geodetic observations and models of the earthquake cycle at Parkfield, from interseismic deformation to coseismic and postseismic processes. Presentations and discussion focus on linking surface observations to fault‑zone processes at depth. Session Chair: Nathan Toke
08:30 - 08:45	Numerical Modeling of Parkfield Repeating Earthquakes: Stress Drops, Synchronization, and Aseismic Slip	Semechah Lui
08:45 - 09:00	Parkfield earthquakes: lessons from geodesy	Yuri Fialko
09:00 - 09:15	Simulating and observing earthquake cycles through off-fault deformation	Yihe Huang
09:15 - 09:30	How are interseismic, co-seismic, and post-seismic observations of Mw 6 Parkfield related to each other? Insights from physics-based modeling and questions to the future event(s)	Nadia Lapusta
09:30 - 10:00	Discussion
10:00 - 10:30	Poster Session 3 (and coffee/tea hosted by SCEC) Final opportunity to view posters and engage in informal scientific discussions.
10:30 - 12:00	Session 5: Critical Research Needs and Opportunities A forward‑looking session focused on identifying critical research gaps, emerging tools, and opportunities for coordinated community efforts. Talks and discussion emphasize alignment with national priorities and pathways for future collaborative activities centered on Parkfield. Moderator: Roland Bürgmann Invited Panelists: Tim Dawson, Kim Blisniuk, Elizabeth Cochran, Ahmed Elbanna, Allison Faris
12:00 - 13:00	Lunch
13:00 - 14:30	Breakout Session 2: Developing Community Reports Participants work in breakout groups to synthesize discussions into concise reports outlining key scientific questions, priorities, and recommended community actions.
14:30 - 15:00	Break
15:00 - 16:30	Session 6: Report‑Back and Wrap‑Up Discussion Breakout groups present their findings, followed by a group discussion to integrate results into a shared vision for the future of Parkfield science.
16:30	Workshop adjourns
16:30 - 17:00	Meeting of the Workshop Organizing Committee

Poster Presentations

#	Last Name	First Name	Poster Title
3	Aguilar Suarez	Leonardo	Enhanced Earthquake Catalog for Parkfield
2	Alongi	Travis	Fault zone compleixty and roughness measured with seismicity at Parkfield
5	Blanpied	Michael	The NEHRP Post-Earthquake Investigations Program
8	Clements	Tim	The need for (more) continuous acceleration data in Parkfield, CA
14	Fang	Lihua	Trade space for time for inspecting an earthquake cycle by modern seismological observation: The central-southern part of the Sichuan-Yunnan rhombic block
13	Gong	Jianhua	A Tale of Two Faults: Comparing Long-Term Seismicity Patterns Along the Parkfield and Gofar Transform Faults
1	Harris	Ruth	Four decades of Parkfield Science Discoveries
10	Li	Linxuan	Ubiquitous Interactions and Subcritical Patches Explain the Irregularity of Repeating Earthquakes
15	Lin	Li-Chieh	The Full Kinematics of the Central San Andreas Fault using UAVSAR and Sentinel-1 data
4	Margolis	Adam	An Updated San Andreas Fault Geometry in Parkfield, California
18	Arrowsmith	Ramon	Middle Mountain Geologic Structure and 2004 Earthquake Surface Fracturing
17	Peng	Zhigang	Re-estimating the early aftershock decay rate and the aftershock duration of the 2004 M6.0 Parkfield earthquake
16	Moore	Diane	Deformation history of cataclasite recovered in SAFOD core adjacent to the SDZ
9	Shrestha	Rajani	Linear Streaks of Seismicity Along the San Andreas
12	Sun	Yudong	Experimental and Numerical Modeling of Earthquake Rupture Interactions Across Multiple Asperities and Barriers
6	Yoon	Clara	Preparing a rapid enhanced aftershock catalog workflow for the next Parkfield earthquake
7	Zhang	Hao	Imaging the rupture of next Parkfield earthquakes with Distributed Acoustic Sensing
11	Zhang	Wenqiang	Adjoint-based inversion for stress and frictional parameters in 3D dynamic earthquake rupture models

Participants

Last Name	First Name	Organization
Aguilar Suarez	Leonardo	Stanford University
Alongi	Travis	U.S. Geological Survey
Arrowsmith	Ramon	Arizona State University
Atterholt	James	U.S. Geological Survey
Bakun	William	U.S. Geological Survey (Retired)
Baltay	Annemarie	U.S. Geological Survey
Barall	Michael	U.S. Geological Survey
Barbour	Andy	U.S. Geological Survey
Belyalova	Alina	Stanford University
Bilham	Roger	University of Colorado
Biondi	Ettore	Stanford University
Blanpied	Michael	U.S. Geological Survey
Blisniuk	Kim	San Jose State University
Burgmann	Roland	University of California, Berkeley
Carpenter	Brett	University of Oklahoma
Catchings	Rufus	U.S. Geological Survey
Cebry	Sara	U.S. Geological Survey
Clements	Timothy	U.S. Geological Survey
Cochran	Elizabeth	U.S. Geological Survey
Dawson	Tim	California Geological Survey
DeLong	Stephen	U.S. Geological Survey
Elbanna	Ahmed	USC/SCEC
Ellsworth	Bill	Stanford University
Fang	Lihua	China Earthquake Administration
Faris	Allison	U.S. Geological Survey
Fialko	Yuri	University of California, San Diego
Funning	Gareth	University of California, Riverside
Gong	Jianhua	Indiana University
Guns	Katherine	U.S. Geological Survey
Haddadi	Hamid	California Geological Survey
Hanagan	Catherine (Cassie)	U.S. Geological Survey
Hardebeck	Jeanne	U.S. Geological Survey
Harris	Ruth	U.S. Geological Survey
Hearn	Elizabeth	U.S. Geological Survey
Hellweg	Peggy	University of California, Berkeley
Hough	Susan	U.S. Geological Survey
Hu	Yanlan	Stanford University
Huang	Yihe	University of Michigan
Jeppson	Tamara	U.S. Geological Survey
Kuo	Li-Wei	National Central University
Langbein	John	U.S. Geological Survey
Lapusta	Nadia	California Institute of Technology
Li	Linxuan	California Institute of Technology
Lin	Li-Chieh	University of California, Riverside
Lui	Semechah	University of Toronto
Madden	Elizabeth	San Jose State University
Margolis	Adam	University of California, Riverside
Martínez-Garzón	Patricia	GFZ Helmholtz Centre for Geosciences
McGuire	Jeff	U.S. Geological Survey
Mei	Cheng	Columbia University
Minson	Sarah	U.S. Geological Survey
Moore	Diane	U.S. Geological Survey (Retired)
Murray	Jessica	U.S. Geological Survey
Nevitt	Josie	U.S. Geological Survey
Parker	Grace	U.S. Geological Survey
Peng	Zhigang	Georgia Tech
Philibosian	Belle	U.S. Geological Survey
Rubinstein	Justin	U.S. Geological Survey
Schultz	Adam	Oregon State University
Segall	Paul	Stanford University
Shelly	David	U.S. Geological Survey
Shrestha	Rajani	California Institute of Technology
Sone	Hiroki	University of Wisconsin-Madison
Sun	Yudong	Stanford University
Taira	Taka'aki	University of California, Berkeley
Thatcher	Wayne	U.S. Geological Survey
Thurber	Clifford	University of Wisconsin-Madison
Toke	Nathan	Utah Valley University
Vermeer	Jessie	U.S. Geological Survey
Wesson	Rob	U.S. Geological Survey (Retired)
Yoon	Clara	U.S. Geological Survey
Zhang	Hao	California Institute of Technology
Zhang	Wenqiang	Stanford University

SCEC Activities Code of Conduct

The Statewide California Earthquake Center (SCEC) fosters a diverse and inclusive community where everyone feels safe, productive, and welcome. We expect all participants in SCEC-supported events to uphold this commitment by adhering to the SCEC Activities Code of Conduct.

SCEC Meetings and Workshops

The SCEC Annual Meeting brings together 400-500 participants worldwide to share breakthroughs, assess progress, and chart a collaborative path for earthquake science. All of the Center activities are presented, analyzed, and woven into a set of priorities for SCEC to pursue in the future.