The European Union’s Atlantic region is susceptible to a wide range of geohazards. Measuring ground surface motion is critical for detecting and monitoring many of these geohazards. We present observations of potential ground motion as defined by Interferometry of Synthetic Aperture Radar (InSAR) over areas encompassing three Citizen Observatory (CO) pilot sites of the AGEO project—the Lisbon Region, eastern Madeira Island, and Northern Ireland. These data are based on multi-temporal processing of C-Band Synthetic Aperture Radar (SAR) images that were acquired between 2014 and 2022 by Copernicus Sentinel-1 satellites. In the Lisbon region, our measurements reveal several subsidence hotspots with a peak velocity of about –5 mm/yr. An area of apparent ground uplift occurs at the northern part of Setúbal Peninsula. The observed motions are likely induced by groundwater over-pumping, urbanization on poorly consolidated sediments, or local tectonic fault motions. On Madeira Island, ground motions of up to 7 mm/yr are inferred on urbanized slopes in the Machico valley and the Canical areas; these are linked with slow landslides. In Northern Ireland, the InSAR data reveal potential subsidence of peatlands around the Causeway coast; any link between InSAR-detected motions and landslides there is ambiguous. Elsewhere in Northern Ireland, the data indicate subsidence of peatland west of Belfast city and of reclaimed land within the Belfast harbour area. These observations are attributed to peatland drainage dynamics and to urbanization-induced consolidation of estuarine sediments (‘sleech’), respectively. Good agreement is shown between our InSAR results and those of the Copernicus program’s new European Ground Motion Service (EGMS) for all three study areas. Both the EGMS and bespoke local InSAR datasets can thus provide a basis for focusing the ground-based efforts of Citizen Observatories for geohazards on areas of detected motion. InSAR-derived ground motion data can also contextualize Citizen Science-derived datasets.