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Secure Web Portal

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Our Mission
Overview

Ending Nuclear Tests

The Treaty

The Organization
Overview

The Preparatory Commission

The Provisional Technical Secretariat

CTBTO After Entry Into Force

States Signatories

Article XIV Conferences

Ministerial Meetings

Our Work
Overview

Verification Regime

Country Profiles

Station Profiles

Detecting Nuclear Tests

Civil and Scientific Applications

CTBTO TeST Centre

International Monitoring System
Overview

Monitoring Technologies

Seismic Monitoring

Infrasound Monitoring

Hydroacoustic Monitoring

Radionuclide Monitoring

IMS Map

International Data Centre
Overview

Waveform Data Processing and Analysis

Radionuclide Data Processing and Analysis

Data Fusion and Atmospheric Transport Modelling

On-site Inspection
Overview

Overview of an OSI

OSI Procedures

OSI Techniques

OSI Training

OSI Exercises

News and Events
Overview

News

Events

Schedule of Sessions

Separator
Overview

Capacity Building and Training

Science and Technology Conferences

International Day Against Nuclear Tests

Resources
Overview

For Member States
Overview

Status of Signature and Ratification

Facility Agreements

Experts Communication System

Membership Benefits

Status of Assessed Contributions

Legal Resources

Protocol Resources

Voluntary Contributions Resources

For The Media
Overview

News

Press Releases

CTBTO Media Packages

Selected Statements from CTBTO

For Civil Society
Overview

CTBTO Youth Group [CYG]

CTBT Young Professionals Network [YPN]

Information Materials
Overview

IMS Map

Brochures and Factsheets

Annual Reports

Spectrum

Glossary

Frequently Asked Questions (FAQs)

For Researchers and Experts
Overview

vDec

Secure Web Portal

Capacity Building and Training

Knowledge and Training Portal

Work With Us
Overview

Employment
Overview

Diversity and Inclusion

CTBTO Benefits

Living in Vienna

Internships

CTBTO Mentoring Programme

Procurement
Overview

Business Opportunities

How To Do Business With Us

List of Competitive Procurement Awards

Major Purchase Categories

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Tonga ratifies CTBT, completing Treaty universalisation in Pacific region

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HA08 North repaired: full hydroacoustic coverage achieved, first for IMS

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See. Hear. Detect: CTBTO Science in Action at Long Night of Research

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US nears IMS completion with Antarctic infrasound station

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CTBTO and Côte d’Ivoire Sign Facility Agreement for IMS Stations in Dimbokro

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Our Mission

See all

Ending Nuclear Tests

The Treaty

The Organization

Integrated Field Exercise (IFE26)

30 years of the CTBT

Our Work

Learn More

News and Events

See all

CTBT marks 30 years as States gather at NPT Review Conference
Read More

Statement by Robert Floyd, Executive Secretary of the CTBTO
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Namibia to host CTBTO’s Integrated Field Exercise in 2026
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Highlights of 2025 voluntary contributions
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Verification today, tomorrow, together: Highlights from SnT2025
Read More

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Schedule of sessions

Working Group B

Sixty-Seventh Session Of Working Group B

25 Aug 2026 -04 Sep 2026

Advisory Group

Sixty-Seventh Session Of The Advisory Group

08 Sep 2026 -11 Sep 2026

Working Group A

Seventieth Session Of Working Group A

19 Oct 2026 -21 Oct 2026

Training and Workshops

Technical Training For Station Managers Of…

02 Nov -06 Nov 2026

Training Course On Ndc Capacity Building For…

28 Oct -30 Oct 2026

International Hydroacoustics Workshop 2026

07 Sep -09 Sep 2026

Executive Secretary

Robert Floyd

Selected Statements

Photos Stream

Resources

See all

Member States

Researchers & Experts

Civil Society

Media

Information Materials

See all

CTBTO Fact Sheet

International Monitoring System (IMS) Map

Verification Regime Brochure

Civil and Scientific Applications Brochure

On-Site Inspection Brochure

Work With Us

Join CTBTO on our mission to create a world free of nuclear testing. Learn more about employment and business opportunities with the Provisional Technical Secretariat.

EmploymentProcurement

Our Mission

Ending Nuclear Tests

The Treaty

The Organization

States Signatories

Article XIV Conferences

Ministerial Meetings

Our Work

Verification Regime

International Monitoring System

IMS Map

Monitoring Technologies

Station Profiles

International Data Centre

On-site Inspection

Detecting Nuclear Tests

Civil and Scientific Applications

CTBTO TeST Centre

News and Events

News

Events

Schedule of Sessions

Capacity Building and Training

Science and Technology Conferences

International Day Against Nuclear Tests

Resources

For Member States

For Researchers and Experts

For The Media

For Civil Society

Information Materials

Work With Us

Employment

Procurement

Mailing Address

CTBTO Preparatory Commission, Vienna International Centre, P.O. Box 1200, 1400 Vienna, Austria

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