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Our Work

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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

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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Our Work

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Our Work

Verification Regime

The Comprehensive Nuclear-Test-Ban Treaty (CTBT) prohibits all nuclear explosions, whether they are conducted for military or non-military purposes, no matter how high or low their yield. To monitor compliance, its unique verification regime is designed to detect any nuclear explosion conducted anywhere – underground, under water or in the atmosphere.
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International Monitoring System

The International Monitoring System (IMS) is a unique global network that, when complete, will consist of 321 monitoring stations and 16 laboratories hosted by 89 countries around the globe. Around 90 percent of these 337 facilities are already up and running, providing a steady flow of real-time data.
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Monitoring Technologies

The IMS uses four complementary verification methods – seismic, hydroacoustic, infrasound and radionuclide – using the latest available technology.
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Station Profiles

Find details on the location and status of all 337 International Monitoring System stations and laboratories worldwide.
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International Data Centre

Data are at the core of the CTBT’s verification efforts. Located in the CTBTO’s headquarters in Vienna, the International Data Centre (IDC) collects, processes and analyses monitoring data from more than 300 IMS facilities and distributes them to Member States in both raw and analysed form.
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On-Site Inspection

On-site inspection (OSI) is the final component of the CTBT verification regime. Once the Treaty enters into force, Member States will be able to request an inspection to gather further evidence on the ground if the global monitoring system detects a possible nuclear explosion.
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Detecting Nuclear Tests

The CTBT’s International Monitoring System has already proved its effectiveness, detecting all six declared nuclear tests conducted between 2006 and 2017.
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Civil and Scientific Applications

Beyond its core purpose of detecting nuclear explosions, the International Monitoring System produces a treasure trove of data that can be put to wider civil and scientific use, from helping to save lives in a tsunami or tracking fallout from a nuclear accident to expanding our knowledge of the Earth and the natural world.
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CTBTO TeST Centre

The CTBTO Technology Support and Training Centre (TeST Centre) is a multipurpose hub for equipment storage, maintenance and testing as well as training, supporting the build-up and sustainment of the verification regime and providing the Provisional Technical Secretariat (PTS) with the operational capability and readiness required for entry into force.
Read more

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

Get in touch with us

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