How similar is the International Monitoring System to the original concept of such a verification system?

The final report foresaw a network of 160-170 land-based posts, together with an additional ten sea-based posts outfitted with nuclear detection technologies to detect atmospheric and underwater nuclear tests having a yield greater than one kiloton, and underground nuclear tests with yields greater than five kilotons.

By comparison, when fully completed and operational, the CTBTO’s International Monitoring System will consist of: 170 primary and auxiliary seismic stations, 60 infrasound stations, eleven hydroacoustic stations, 80 radionuclide stations and 16 radionuclide laboratories located in 89 countries around the world.

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