The power of verification.



The success of the Comprehensive Nuclear-Test-ban Treaty rests on science in the service of diplomacy. Its International Monitoring System (IMS), already operating with more than 300 stations and laboratories in over 90 countries, uses seismic, hydroacoustic, infrasound and radionuclide technologies to detect any nuclear explosion. Data from this network flow to the International Data Centre in Vienna, where they are processed around the clock and made available to all signatory States.


CTBTO Executive Secretary Robert Floyd addressing staff, Vienna International Centre, Vienna, Austria, 2023.



This transparency builds confidence. All States rely on the same objective information to assess adherence to the Treaty and to determine whether a nuclear test has taken place. Even countries that have not yet ratified the Treaty host facilities and benefit from the data. That participation reflects the value and credibility that nations place in a system built through global cooperation.

Those benefits extend well beyond peace and security: IMS data contribute to tsunami warning systems, support disaster response and help advance scientific research and understanding that serve us all.

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