Annex 2 State*Yes
Signature Date24-SEP-1996
Ratification Date08-JUL-1997

Monitoring Facilities

LocationTypeTreaty CodeStatus
Ohita, KyushuAuxiliary Seismic StationAS051Certified
Kunigami, OkinawaAuxiliary Seismic StationAS052Certified
Hachijojima, Izu IslandsAuxiliary Seismic StationAS053Certified
Kamikawa-asahi, HokkaidoAuxiliary Seismic StationAS054Certified
Chichijima, OgasawaraAuxiliary Seismic StationAS055Certified
IsumiInfrasound StationIS30Certified
MatsushiroPrimary Seismic StationPS22Certified
Japan Atomic Energy Research Institute Tokai, IbarakiRadionuclide LaboratoryRL11Certified
OkinawaRadionuclide StationRN37Certified
Takasaki, GunmaRadionuclide StationRN38Certified
Takasaki, GunmaNoble Gas SystemCertified

Additional Information

Facility Agreement: Yet to be concluded

Japan makes voluntary contribution in support of the verification regime and GEM (20 January 2014), see CTBTO Press Release.

Tsunami Warning Agreement: signed (11 August 2008), see CTBTO press release

Following the March 2011 Japan disaster, Japan made a voluntary contribution of around US$ 737,000 in 2012 to enhance the CTBTO’s capabilities to monitor the dispersion of radioactivity in the atmosphere, see CTBTO press release.

Workshops and seminars hosted (selection):

  • Hydroacoustic Workshop from 15 to 19 October 2012
  • East Asia National Data Centre Workshop from 22 to 24 September 2012
  • On-site inspection workshop from 30 June to 4 July 2003 in Hiroshima

Presided 1999 Article XIV Conference.

Ambassador Yukio Takasu, Permanent Representative to the United Nations in Vienna, was Chairperson of the CTBTO Preparatory Commission in 2004, see CTBTO press release.

Japan was the fourth State to ratify the CTBT, see CTBTO press release.

Featured station: Radionuclide station RN38, Takasaki


"In the face of the Great East Japan Earthquake and the subsequent nuclear accident at the Fukushima Dai-ichi Nuclear Power Station, we have received kind support and warm expressions of solidarity from around the world. The [CTBTO] undertook tremendous efforts to quickly provide to the international community accurate and objective information on the dispersion of radionuclides caused by the tsunami and the nuclear accident, using data from Japan as well."
Foreign Minister Koichiro Gemba at the 2011 Article XIV Conference in New York – full statement (PDF)

The 11 March Japan disaster

Country Profiles

Country Profiles