We demonstrated a ground-based synthetic aperture radar (GB-SAR) system that has been monitoring large-scale landslides in the Arato-zawa area of Kurihara City, Miyagi Prefecture since 2011, which occurred in the 2008 Iwate-Miyagi Nairiku Earthquake. Radar measurement results that can capture displacements of 1 mm or less on the ground surface have been distributed to relevant parties such as Kurihara City Hall as landslide early warning information, but from October 2021 they will be open to the public at the Kurikoma Area Geopark Visitor Center.