What comprises the Verification Regime’s International Monitoring System (IMS)?

The CTBTO’s International Monitoring System consists of 321 stations located around the world that use four different technologies — seismic, hydroacoustic, infrasound and radionuclide — to monitor the Earth for nuclear explosions. These stations are supported by 16 radionuclide laboratories. To provide uniform coverage of the entire globe, many stations have had to be built in remote, inaccessible areas. This, in turn, has posed engineering challenges unprecedented in the history of international arms control.

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