SCEC Award Number 23136 View PDF
Proposal Category Collaborative Proposal (Data Gathering and Products)
Proposal Title Introducing Community Geodetic Model Version 2: moving beyond Ridgecrest
Investigator(s)
Name Organization
Ekaterina Tymofyeyeva National Aeronautics and Space Administration Michael Floyd Massachusetts Institute of Technology Kathryn Materna United States Geological Survey Katherine Guns University of California, San Diego Kang Wang University of California, Berkeley Zhen Liu National Aeronautics and Space Administration Gareth Funning University of California, Riverside Thomas Herring Massachusetts Institute of Technology
Other Participants Eric Fielding (JPL)
David Sandwell (SIO/UCSD)
David Bekaert (JPL)
Simran Sangha (JPL)
Marin Govorcin (JPL)
Alejandro Gonzalez (CICESE)
Xiaohua Xu (UT Austin)
SCEC Priorities 1a, 2a, 3e SCEC Groups CXM, Geodesy, SDOT
Report Due Date 03/15/2024 Date Report Submitted 11/14/2024
Project Abstract
 We fulfilled three primary objectives during this award: the consolidation and release of the Community Geodetic Model (CGM) version 2.0.0, including updated descriptions and citation information, and the CGM Explorer; advancements in the research of how to bridge temporal discontinuities (e.g. earthquakes such as the Ridgecrest events) in producing InSAR time series; and the continuation of regular meetings among the CGM (InSAR) Working Group, specifically, to achieve these goals.
Intellectual Merit The Community Geodetic Model is one of several Community Models within the scope of SCEC. The research undertaken here not only contributes significantly to the continued development of the CGM but was also a breeding ground for new ideas and research, specifically regarding updating or introducing new methods for producing InSAR time series across a temporal discontinuity, such as an earthquake. This is a critical step for InSAR, as a long-period geodetic technique, since its use has, to date, been more for the study of large, discrete events themselves and slower but secular tectonic deformation; the transition to InSAR time series in the era of regular (e.g. 12-day) acquisitions requires a step-change in the processing of InSAR, to which this group and this project contributed many preliminary results.
Broader Impacts This collaborative proposal supported many early-career scientists, who are starting to establish themselves as researchers or assistant professors, in an environment that also allows leadership and project management skills to be learned and honed in the presence of middle-career and established scientists. The broad group also includes NASA/JPL and USGS researchers and therefore maintains and strengthens the bonds between the major sponsoring agencies of SCEC and the academic research community. This is critical to building the relationships and skills that will be required to carry SCEC, USGS and NASA (and NSF) research and results interests into the future. The current outputs of the Community Geodetic Model, in general as well as specifically the InSAR-focused research, feed back into the community in a variety of ways: a forum of offering and discussing needs and paths forward; a testing ground for applicable methods; and informing or updating operational products that already exist (such as JPL's ARIA and OPERA or NASA's SOPAC/JPL MEaSUREs ESESES), as well as USGS's interests in supporting the generation of Community Models.
Exemplary Figure Figure 1: Screenshot of the CGM Explorer showing the selection of continuous and survey GNSS velocity vectors, colored by magnitude of velocity, and InSAR descending track 173 line-of-sight velocities relative to its reference pixel (white square); the outlines of the other three InSAR tracks released as part of the CGM version 2.0.0 are shown outlined in red, blue and green. The Community Fault Model (CFM) is also available to plot (black lines).
Linked Publications

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