To fill the gap in infrasound network coverage, the Central and Eastern European Infrasound
Network (CEEIN) has been established in 2018 with the collaboration of the Zentralanstalt
für Meteorologie and Geodynamik (ZAMG), Vienna, Austria; the Institute of Atmospheric
Physics of the Czech Academy of Sciences (CAS IAP), Prague, Czech Republic; the Research
Centre for Astronomy and Earth Sciences of the Eötvös Loránd Research Network (ELKH
CSFK), Budapest, Hungary; and the National Institute for Earth Physics (NIEP), Magurele,
Romania. The Main Centre of Special Monitoring National Center for Control and Testing
of Space Facilities, State Agency of Ukraine joined CEEIN in 2019. We present the
first CEEIN bulletin (2017-2020) of infrasound-only and seismo-acoustic events, and
using ground truth events, we demonstrate how adding infrasound observations to seismic
data in the location algorithm improves location accuracy. We show how the CEEIN infrasound
arrays improve the detection capability of the European infrasound network and identify
coherent noise sources observed at CEEIN stations.
