United States of America

Annex 2 State*Yes
Signature Date24-SEP-1996
Ratification Date

Monitoring Facilities

LocationTypeTreaty CodeStatus
Guam, Marianas IslandsAuxiliary Seismic StationAS105Certified
Palmer Station, AntarcticaAuxiliary Seismic StationAS106Certified
Tuckaleechee CavernsAuxiliary Seismic StationAS107Certified
Piñon Flat, CAAuxiliary Seismic StationAS108Certified
Yreka, CAAuxiliary Seismic StationAS109Certified
Kodiak Island, AKAuxiliary Seismic StationAS110Certified
Albuquerque, NMAuxiliary Seismic StationAS111Certified
Attu Island, AKAuxiliary Seismic StationAS112Certified
Elko, NVAuxiliary Seismic StationAS113Certified
South Pole, AntarcticaAuxiliary Seismic StationAS114Certified
Newport, WAAuxiliary Seismic StationAS115Certified
San Juan, PRAuxiliary Seismic StationAS116Certified
Wake IslandHydroacoustic StationHA11Certified
Fairbanks, AKInfrasound StationIS53Certified
Palmer Station, AntarcticaInfrasound StationIS54Planned
Windless Bight, AnarcticaInfrasound StationIS55Certified
Newport, WAInfrasound StationIS56Certified
Piñon Flat, CAInfrasound StationIS57Certified
Midway IslandsInfrasound StationIS58Certified
Hawaii, HIInfrasound StationIS59Certified
Wake IslandInfrasound StationIS60Certified
Lajitas, TXPrimary Seismic StationPS46Certified
Mina, NVPrimary Seismic StationPS47Certified
Pinedale, WYPrimary Seismic StationPS48Certified
Eielson, AKPrimary Seismic StationPS49Certified
Vanda, AntarcticaPrimary Seismic StationPS50Certified
Pacific Northwest National LaboratoryRadionuclide LaboratoryRL16Certified
Sacramento, CARadionuclide StationRN70Certified
Sand Point, AkRadionuclide StationRN71Certified
Melbourne, FLRadionuclide StationRN72Certified
Palmer StationRadionuclide StationRN73Certified
AshlandRadionuclide StationRN74Certified
AshlandNoble Gas SystemCertified
Charlottesville, VARadionuclide StationRN75Certified
Charlottesville, VANoble Gas SystemCertified
Salchaket, AKRadionuclide StationRN76Certified
Wake IslandRadionuclide StationRN77Certified
Wake IslandNoble Gas SystemCertified
Midway IslandsRadionuclide StationRN78Certified
Oahu, HIRadionuclide StationRN79Certified
Oahu, HINoble Gas SystemCertified
Upi, GuamRadionuclide StationRN80Certified

Additional Information

Facility Agreement: Yet to be concluded

Workshops and seminars hosted (selection)

Voluntary Contributions

  • In-kind voluntary contributions in 2014 totalling $ 1 million in support of the inception phase of the IDC re-engineering project and radioxenon background measurements.

  • In-kind voluntary contributions in 2013 of approximately $ 3.7 million in support of the Integrated Field Exercise 2014 and various verification-related projects, and approximately $ 3.5 million in support of the IDC redesign project.

  • In-kind voluntary contributions in 2012 of $ 7.5 million for verification related projects.

  • In-kind voluntary contribution in August 2011 valued at $ 8.9 million for projects implemented by U.S. agencies in coordination with the CTBTO in support of the further development of CTBTO verification and monitoring activities.

  • Financial contribution of $25.5 million in September 2011 to reconstruct hydroacoustic station HA04 in the French Southern Territories.

Featured stations


"[The CTBT] verification regime is one of the great accomplishments of the modern world. The international monitoring system is nearly complete; it is robust, it is effective, and it has contributed critical scientific data on everything from tsunami warnings to tracking radioactivity and nuclear reactor accidents."

U.S. Secretary of State John Kerry at the September 2014 CTBT Ministerial Meeting, New York - full statement

Country Profiles

Country Profiles