Year: 2026
Type: article
Abstract: We present a new algorithm, AutoCF, for automatically constructing coordinate functions (CFs) for continuously operating GNSS reference stations (CORSs). The iterative algorithm alternates between application of LASSO and Ridge Regression methods, with hyperparameters successively tightened with each iteration to more judiciously scrutinize candidate breakpoints. We developed the algorithm using data from 60 CORSs from two independent analysis centers. These CORSs experienced displacements associated with four large magnitude earthquakes. Some stations are located in the near‐field of two of these earthquakes, while the other two earthquakes occurred at intermediate and far‐field distances from the nearest station. We show that automatically determined CFs track the observed site motion with weighted RMS (WRMS) residual scatter less than 2–3 mm and 5–7 mm for horizontal and vertical components, respectively. We tuned the algorithm such that estimates for site velocity are as close to the estimates generated by the independent processing centers as those centers' results are to one another. We then assessed the algorithm's performance on a new, unseen data set comprising 3226 coordinate time series generated independently at NOAA's National Geodetic Survey. The median WRMS misfits of the automatic fits to the time series are 1 mm for horizontal and 4 mm for vertical components. 587 stations (18%) were flagged for human assessment. A velocity solution computed with station trajectories parameterized according to the algorithm‐assisted analysis agrees with similar large‐scale solutions produced by three independent analysis centers at the level of 0.2 mm/yr in horizontal components.
Source: Earth and Space Science
DOI: 10.1029/2025ea004741
Language: English
Subfield: Aerospace Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,650
OpenAlex ID: W4415300934