International Monitoring System (IMS) map

This map of the International Monitoring System (IMS) shows current IMS facility locations as of August 2021, reflecting adjustments that have been approved by the Preparatory Commission since the CTBT opened for signature. The snapshot will be updated in future as appropriate.


Information Materials

In this section you can find brochures, maps, booklets and other guides related to the work of CTBTO Preparatory Commission.




CTBTO Spectrum Publication

CTBTO Spectrum is the bi-annual, English language publication of the CTBTO that profiles key issues and aspects of the organization's work. In addition to spotlighting major players in the field of nuclear disarmament and non-proliferation, it also features Verification Highlights, Verification Science and Potential Civil and Scientific Applications. Readers can subscribe online or receive CTBTO Spectrum on a regular basis.

CTBTO Annual Reports

This section contains CTBTO Annual Reports from 2000 to 2020.







Special CTBT20 Publication

To commemorate the 20th anniversary of the opening for signature of the Comprehensive Nuclear-Test-Ban Treaty (CTBT) a number of high-level events are being organized throughout 2016. This publication was launched to coincide with the Ministerial Meeting in June 2016. It relates the genesis of the Treaty since the creation of the Conference on Disarmament of 1979, as well as the challenges and achievements toward the entry into force that have taken place over the last twenty years.



Using CTBTO Information Materials

We encourage readers to take advantage of this diversity of information on the CTBTO and its activities, all of which is available on in hard copy (free of charge) or as a website download.

This information can be used for workshops and presentations, as well as in educational settings and for self-edification in the realm of nuclear non-proliferation and disarmament.

All products can be ordered in hard copy from Public Information by emailing