Chapter 0Maps (Placeholder)Monitoring facilities World map showing CTBT Monitoring facilitiesCTBTO Monitoring facilitiesPrimary Seismological StationAuxiliary Seismological StationRadionuclide StationRadionuclide LaboratoryHydroacoustic StationInfrasound StationThe CTBTO maintains a network of 334 monitoring facilities worldwide. Data: CTBTO International Monitoring System (August 2021), Natural Earth. Graphic: Lillith Schmidt, Max Köhler/PRIF Licensed under CC BY 4.0.