International Federation of Digital Seismograph Networks
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System Upgrade 2026-07-02

The fdsn.org website will undergo a scheduled upgrade on 2026-07-02. Some operations may be paused during the process, and live data such as user sessions may be reset.

This message will be updated with details as the update time approaches.

FDSN Working Group IV

Comprehensive Test Ban Treaty Coordination

The mission of WG IV is to explore avenues for fruitful interaction between the Federation and the Comprehensive Test Ban Treaty Organization (CTBTO), and to provide a forum for individual FDSN members to raise and discuss issues of common interest related to the set up and operation of the CTBT International Monitoring System

This list has moved to https://groups.google.com/a/fdsn.org/g/fdsn-wg4-ctbt.
Email address
fdsn-wg4-ctbt@fdsn.org
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