SCEC Award Number 19106 View PDF
Proposal Category Individual Proposal (Data Gathering and Products)
Proposal Title Towards Operational GNSS Products and Web Access for the CGM
Name Organization
Michael Floyd Massachusetts Institute of Technology Thomas Herring Massachusetts Institute of Technology
Other Participants
SCEC Priorities 1a, 2a, 3e SCEC Groups CXM, Geodesy, SDOT
Report Due Date 03/15/2020 Date Report Submitted 03/26/2020
Project Abstract
We have undertaken three major tasks under this project award, two of which were proposed for this project and the other of which was as part of the community response to the July 2019 Ridgecrest earthquakes, which involved both SCEC-funded scientists as well as those with other forms of support to respond to the earthquakes. The two proposed tasks were to continue to build towards operational product generation for continuous GNSS time series for the Community Geodetic Model, and begin development in direct collaboration with SCEC of a CGM web viewer. This award also supported our response to the Ridgecrest earthquakes, which generated a paper and data products.
Intellectual Merit The Community Geodetic Model is a core science product of SCEC, designed for use by the community as a consistent dataset for their research, as well as by the public at large. Our involvement contributes to two aspects: (1) The thorough understanding on publicly-available GNSS time series and velocity products, and their rigorous alignment and intergration to produce merged products, which should be better than any individual set of products alone; and (2) the development of a web portal via which users and anyone interested in the tectonic geodesy of southern California can peruse and use for their research or education.
Broader Impacts The CGM is intended not just to provide data products to the scientific community but also to allow the public an intuitive viewer through which to educate themselves about the nature of southern Californian tectonics and hazards, and how geodesy observes and helps us to understand those motions.

Immediate (and accurate) data collection in response to earthquakes also provides future generations with the data required to boost understanding of the earthquake relative to processes that happened before, during and after (for days to years) the earthquake.
Exemplary Figure Figure 3: Estimated GNSS displacements for the Mw6.4 (left), Mw7.1 (center) and cumulative (right) Ridgecrest earthquakes. Blue triangles are survey sites observed immediately after the earthquake shown, for which blue vectors represent estimated displacements; red vectors are estimated displacements at continuous sites for the earthquake shown. (Floyd et al., 2020, Figures 2, 3 and 4).