The International Federation of Digital Seismograph Networks, or FDSN, is a global organization consisting of groups that install and maintain digital, broadband seismic recorders either nationally or globally. Any organizations operating more than one broadband station is eligible for membership. Members agree to coordinate station siting and provide free and open data. This cooperation helps scientists all over the world to further the advancement of earth science and particularly the study of global seismic activity. FDSN is a participant in the Global Earth Observation System of Systems, or GEOSS.