Group A, Poster #075, Tectonic Geodesy

REGNOM GNSS SCEC-Community Geodetic Model for Crustal Deformation Studies

Ignacio Garcia, Alejandro Gonzalez-Ortega, Elvia Ramon, & Eduardo Rodriguez
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Poster Presentation

2024 SCEC Annual Meeting, Poster #075, SCEC Contribution #13967 VIEW PDF
The Northwestern Geodetic Network of Mexico (REGNOM; http://regnom.cicese.mx/) provides the opportunity to study surface deformation processes aimed to comprehend the seismotectonics of the region. REGNOM has been collecting survey and continuous geodetic data from the Global Navigation Satellite Systems (GNSS) since more than 10 years (after El Mayor-Cucapah earthquake Mw7.2), defining an accurate geodetic reference frame for crustal deformation along the Peninsular Ranges and the Mexicali Valley region in Northern Baja California.

On a large scale, Southern California (SoCal) and Northern Baja California (NBC) share a common tectonic regime. Here the importance of contributi...ng with the SCEC-Community Geodetic Model (CGM) within an equivalent geodetic reference frame, where the final geodetic solutions from different analysis centers (AC) are combined. This is a region dominated by several active fault systems, large magnitude earthquakes (M_w≥7), swarms and high heat flow activity, what characterize the physical transition between the Pacific and North America plate’s boundary relative motion of ~50 mm/yr.

We analyzed REGNOM and Nevada Geodetic Lab AC’s position time series final solutions from 17 sites in a fixed Northamerica IGB14 reference frame, where the 3D velocity correlation parameter coefficient is 0.99 and the root mean square error is 0.68. This statistical test describes a common-geodetic-frame GNSS crustal velocity field for SoCal and NBC, which is used for studying the postseismic relaxation period from mid-2010 to late-2022.
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Citation: Garcia, I., Gonzalez-Ortega, A., Ramon, E., & Rodriguez, E. (2024, 09). REGNOM GNSS SCEC-Community Geodetic Model for Crustal Deformation Studies. Poster Presentation at 2024 SCEC Annual Meeting.
Keywords: REGNOM, Community Geodetic Model, GNSS, Geodetic Reference Frame, cortical deformation.
SCEC Award: 24065
Relevant SCEC Themes:
Improving Observations and Closing Data Gaps