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Abstract:
The Carpathian region of Ukraine plays a critical role in seismic monitoring due to its tectonic setting and proximity to the Vrancea Seismic Zone, which is known for its deep‑focus earthquakes. The regional seismic network across western Ukraine, covering the Carpathian and adjacent areas, currently comprises 22 stations, of which 5 are not operational, 18 stations continue to operate
with Soviet‑era long‑ or short‑period sensors. Data from these stations are archived locally and are not publicly accessible. Five stations in the Carpathians (UT.BRIU, UT.KSV, UT.MEZ, UT.RAKU, UT.STNU) were recently upgraded with modern broadband sensors (deployed alongside the existing instruments) under the ORFEUS Data Integration Grant. This grant, funded through the Geo‑INQUIRE Project and supported by in‑kind contributions from GFZ Helmholtz Centre for Geosciences, GaiaCode, and CNRS Geoazur, provided instruments and technical support that strengthened the network and enabled the station upgrades between September 2024 and March 2025. Data from the upgraded stations are available in real time through the European Integrated Data Archive (EIDA) under the FDSN network code UT, Ukrainian National Seismic Network, and can be accessed via the National Institute for Earth Physics (NIEP) EIDA node in Romania. For the first time, data from Subbotin Institute of Geophysics seismic network have been integrated into EIDA, significantly improving data accessibility and fostering international collaboration. These stations also contribute to the AdriaArray initiative, providing a dense seismic network for monitoring the Adriatic Plate and its active margins. This paper discusses the background, current state, and recent advancements in the region’s seismic network, with a focus on the upgrade of selected stations.
