Unique agency IDAbbreviationFull nameCountryStation(s)
NIEPNIEPNational Institute for Earth PhysicsRomania (ROU)
NIGGGNIGGGNational Institute of Geophysics, Geodesy and GeographyBulgaria (BGR)
NMANMANorwegian Mapping AuthorityNorway (NOR)
NOANOANational Observatory of AthensGreece (GRC)