CTBTO
The Comprehensive Nuclear-Test-Ban Treaty (CTBT) bans all nuclear test explosions. By prohibiting explosive testing, the Treaty effectively prevents countries from developing new nuclear weapons or significantly advancing existing ones. It also makes it extremely difficult for countries that do not have nuclear weapons to develop them.
The CTBTO has established an International Monitoring System (IMS) to ensure that no nuclear test explosion goes undetected. The data collected by the IMS has also been used for disaster mitigation such as earthquake monitoring and tsunami warning, as well as research into fields as diverse as whale migration, climate change and the prediction of monsoon rains.
Video 6: CTBTO's Tsunami Warning System (subtitles)
Video 5: Radionuclide Stations (subtitles)
Video 4: Seismic Stations (subtitles)
Video 3: Infrasound Stations (subtitles)
Video 2: Hydroacoustic Stations (subtitles)
Join the Mission Help Build a World Free of Nuclear Testing
Video 1: How CTBTO's International Monitoring System works (subtitles)
Marking 30 years of the Comprehensive Nuclear-Test-Ban Treaty (CTBT)
From Antarctica to the Arctic: A Global Network Listening to the World
(Social Media) "Every single one of us makes a difference every single day.” Dr Jane Goodall
(Full Message) "Every single one of us makes a difference every single day.” Dr Jane Goodall
CTBTO head Floyd speaks on the International Day Against Nuclear Tests – 29 August 2025
CTBTO Head Robert Floyd on the International Day Against Nuclear Tests – 29 August 2024
Robert Floyd appointed as CTBTO Executive Secretary for second term
BUE24: Putting OSI Capabilities to the Test
Behind the Scenes: CTBTO's Permanent Exhibit at VIC
CTBTO Youth Group (CYG) Global Art Campaign 2024
IDANT: Together We Can Make a Difference.
CTBTO Executive Secretary Dr. Robert Floyd's Statement to the UN Security Council - 18 March 2024
26th OSI Regional Introductory Course
OSI Tabletop Exercise strengthens collaboration to prepare for CTBT’s entry into force (Dec. 2023)
The ‘Power of Together’ to End Nuclear Testing
22 Sept. 2023: 13th Conference on Facilitating Entry into Force of the CTBT (PM Session)
22 Sept. 2023: 13th Conference on Facilitating Entry into Force of the CTBT (AM Session)
CTBTO SnT2023, Forum : Day 4 Thursday 6/22/2023 10:00 CEST, Side event (SE-2.3)
CTBTO head Floyd speaks on the International Day Against Nuclear Tests – 29 August 2023
CTBTO SnT2023, Prinz Eugen Saal : Day 3 Wednesday 6/21/2023 09:00 CEST, Workshop (WS-1)