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Position Statement

GSA: Science, Stewardship, Service


The Capability to Monitor the Comprehensive Nuclear-Test-Ban Treaty (CTBT) Should be Expanded, Completed, and Maintained

Adopted October 2009; Revised November 2012

GSA Preamble and Endorsement of CTBT Position Statement

The Geological Society of America endorsed this position statement in November 2012. The Seismological Society of America and the American Geophysical Union first issued a joint position statement on the seismic verification of the Comprehensive Nuclear Test‐Ban Treaty (CTBT) in 1999. In 2012 both organizations reviewed, updated and reaffirmed the statement.

Please see PDF for AGU statement.



Position Statements adopted by GSA Council may be used freely in their entirety by members in public policy discussions on the scientific issues to which they pertain.

About the Geological Society of America

The Geological Society of America (GSA), founded in 1888, is a scientific society with over 25,000 members from academia, government, and industry in more than 100 countries. Through its meetings, publications, and programs, GSA advances the geosciences, enhances the professional growth of its members, and promotes the geosciences in the service of humankind. GSA encourages cooperative research among earth, life, planetary, and social scientists, fosters public dialogue on geologic issues, and supports all levels of earth-science education. Inquiries about GSA or this position statement should be directed to GSA’s Director for Geoscience Policy, Kasey S. White, at +1-202-669-0466 or .

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