2024 SCEC CGM Workshop:

Towards Statewide and 3-D Deformation Fields for California

Date: September 7, 2024 (9:30 am – 5:30 pm)
Location: Hilton Palm Springs, California
Workshop Organizers: Mike Floyd (MIT) , Katia Tymofyeyeva (NASA JPL)
Award: 24074

Overview

Do you use or generate geodetic data in your research? Are you interested in using or contributing to a curated set of deformation time series and velocities, showcasing your analysis and applications, or aiding a community effort to address inconsistencies in geodetic products? The SCEC Community Geodetic Model (CGM) is a long-term effort to integrate GNSS and InSAR data, from the modern satellite-based geodetic era, in a self-consistent, rigorous and open manner, to derive secular and time-dependent surface velocity and strain rate fields across California. We invite diverse expertise and users to contribute to and benefit from this effort as we extend the temporal and geographic range statewide.

This full-day pre-SCEC Annual Meeting workshop includes invited talks, breakout sessions, and discussions on geodetic product needs and challenges. We aim to identify key research issues, educate users, and address critical questions in the context of SCEC science goals.

We welcome current or potential users or contributors, and encourage early-career students, postdocs, researchers and faculty to participate in shaping the plans for the next generation of the SCEC Community Geodetic Model.

Presentation materials may be viewed 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 They may contain unpublished or preliminary information and should only be used for reviewing the talk. Only the presentations for which SCEC has received permission to post publicly are included below.

Agenda

TimeItemPresenter

09:00 - 09:30

Workshop Check-In

09:30 - 09:45

Introduction and Opening Remarks by Hosts

Mike Floyd and Katia Tymofyeyeva

09:35

Background and motivation for the Community Geodetic Model

09:45 - 11:00

Session 1a: Current Research and Considerations for Geodetic Products and Models
Moderators: Dani Lindsey & Mike Floyd

09:45

The future of InSAR: NISAR and beyond

Katia Tymofyeyeva

10:05

Reference frames: Definitions, realizations, and impacts (PDF)

Tom Herring

10:25

GNSS and InSAR integration for 3-D crustal deformation in California (PDF)

Zheng-Kang Shen & Zhen Liu

10:45

Questions and Discussion

All

11:00 - 11:15

Break

11:15 - 12:10

Session 1b: Use of a Community Geodetic Model for Tectonics and Geophysics
Moderators: Taimi Mulder & Katia Tymofyeyeva

11:15

Integrating InSAR and GNSS for the Intra-Frame Deformation Model (PDF)

Lane Souza

11:35

Addressing long-term changes in crustal deformation from tectonic and non-tectonic processes (PDF)

Roland Burgmann

11:55

Questions and Discussion

All

12:10 - 13:00

Session 2: CGM Version 2 Products and Access, and Community Velocity Field Exercise

12:10

Demonstration of SCEC CGM Explorer and Zenodo archive

Various

12:25

Review of data formats and basic interrogation tools

Kathryn Materna

12:40

Introduction of a Community Velocity Field Exercise

Mike Floyd and Katia Tymofyeyeva

12:50

Open discussion on participation in and contribution to Community Velocity Field Exercise

All

13:00 - 14:00

Lunch

14:00 - 15:30

Session 3: Breakout Discussions

14:00

Breakout 1: Cross-disciplinary discussion groups
- Group 1a: Mike Floyd (moderator); Bill Holt (reporter)
- Group 1b: Katia Tymofyeyeva (moderator); Roland Burgmann (reporter)
- Group 1c: Zhen Liu (moderator); Tom Herring (reporter)
- Group 1d: Kathryn Materna (moderator); Zheng-Kang Shen (reporter)

All

14:30

Breakout 2: Intra-disciplinary discussion groups (guided by topics and other brought up by cross-disciplinary discussion groups)

All

15:00

Reports from breakout discussions

15:30 - 15:45

Break

15:45 - 17:30

Session 4: The Future of the CGM and How to Get There

15:45

Discussion: How do we develop from velocities and time series to combined geodetic products and model deformation fields?

All

16:30

Discussion: Workshop recommendations and future plans for StatewideCEC

All

17:15

Closing remarks by hosts

Mike Floyd and Katia Tymofyeyeva

17:30

Workshop Adjourns

SCEC Community Earth Models (CEM) and Datasets

CEMs are collaborative platforms featuring community-contributed data, models, and tools for earthquake system analysis. They enable 3D visualization, data exploration, sharing, and integrated modeling. The current SCEC Community Geodetic Model (CGM) integrates high-precision GNSS and InSAR data for continuous, detailed ground movement monitoring in Southern California.

ABOUT CEM | CGM ARCHIVE

Discussion Questions

The 2024 SCEC CGM Workshop will address critical questions, framed in the context of SCEC science goals, including:

  • What is the best approach to producing continuous InSAR time series across temporal discontinuities such as an earthquake, given commonly used smoothing approaches to producing InSAR time series?
  • Do GNSS-derived velocities estimated over the same period as those for the InSAR match better than using the complete (usually longer) temporal coverage of the GNSS?
  • If so, does this indicate a fundamental difference in the techniques, e.g. the influence of long-period noise and the implications for the estimation of velocity uncertainties, or truly reflect changes in crustal velocities over periods of time?
  • How do models and corrections commonly applied to GNSS processing, such as tidal and surface loading phenomena and atmospheric (tropospheric and ionospheric) delays, affect InSAR time series and velocities, and should the same corrections ultimately be applied to InSAR processing?
  • What is the inherent reference frame of InSAR products and how is this best transformed rigorously to match the well-defined reference frame of GNSS, particularly without the need to use dense GNSS data to estimate such alignment?
  • What is the best balance and weight between two datasets where one is temporally dense but spatially sparse and the other is temporally sparse but spatially dense?

Participants

Name and Org
MattBrandinUCSD
RolandBurgmannUC Berkeley
GuoChengUNR
NairongDuUW Madison
MikeFloydMIT
GarethFunningUCR
IgnacioGarciaCICESE
AlejandroGonzalez-OrtegaCICESE
ThomasHerringMIT
CelesteHofstetterUCR
WilliamHoltStony Brook U
JunleJiangU Oklahoma
StacyLarochelleColumbia U
Li-ChiehLinUCR
DanielleLindsayUC Berkeley
ZhenLiuCaltech
KathrynMaternaCU Boulder
RobMoakTensora
LaurentMontesiU Maryland
TaimiMulderNRCan
JillianPearseCSULB
MeganPerryU Maryland
Zheng-KangShenUCLA
Lavoisiane Ferreira deSouzaUCSD
MradulaVashishthaStony Brook U
YuehuaZengUSGS

 

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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.

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