The Project for the CTBT supports the work of NGOs and experts to build public and policymaker understanding of the CTBT.

In 1996, the United States was the first nation to sign the Comprehensive Nuclear Test Ban Treaty (CTBT), which “prohibits any nuclear weapon test explosion or any other nuclear explosion.” The CTBT helps curb the spread of nuclear weapons and establishes a global monitoring network to detect and deter cheating. The time for the CTBT is now.

Project News

Israel's Potential Future Ratification of the CTBT

Israel’s permanent representative to the International Atomic Energy Agency (IAEA) and Comprehensive Test Ban Treaty Organization (CTBTO), Merav Zafary-Odiz said “a regional moratorium [on nuclear testing] could enhance security, and potentially lead to a future ratification of the CTBT. Israel has announced its commitment to a moratorium, it would be useful for others to do the same.”

Zafary-Odiz’s statement came during a Jan. 27 panel at the CTBTO’s Symposium on “Science and Diplomacy for Peace and Security” in Vienna. She also noted that a region-wide test ban would enhance security throughout the Middle East region and could be used as an aspect to establishing a Middle East Weapons-of-Mass-Destruction-Free Zone.

Looking Ahead in 2016

In 2009, the Arms Control Association launched this project to help disseminate information, ideas, and analysis about the “longest-sought, hardest-fought prize” in arms control—the Comprehensive Test Ban Treaty (CTBT)—and the steps to bring it into force.

Since then, we’ve seen progress in many areas, including: ratification of the treaty by key states; preparations by key states, including the United States, to bring the treaty to a vote on ratification; and continued progress by the Comprehensive Test Ban Treaty Organization (CTBTO) to monitor and verify compliance.

North Korea's Fourth Nuclear Test: A Wake Up Call

On Jan. 6, North Korea conducted its fourth underground nuclear weapons test explosion. The government in Pyongyang claims it conducted a successful test that “scientifically verified the power” of a small hydrogen bomb. The statement claims that the test signifies a “higher stage” of development of North Korea’s nuclear force.

Initial readings from seismic stations in the region, however, strongly suggest the yield of the blast was slightly smaller than the February 2013 nuclear test. According to the Vienna-based Comprehensive Test Ban Treaty Organization (CTBTO), the “initial location estimate” of the seismic activity shows that the event took place in the area of North Korea’s nuclear test site, Punggye-ri, which is located in the northeast of the country. The test has been universally condemned as a threat to international peace and security and a violation of the global taboo against nuclear testing.

Blasts from the Past

This past October, Undersecretary of State for Arms Control and International Security Rose Gottemoeller visited several states where the United States conducted some of the 1,030 nuclear weapons test explosion before the end of nuclear weapons testing in September 1992.

Her mission: to speak about the enduring value of the 1996 Comprehensive Test Ban Treaty (CTBT)—which the United States was the first to sign but is still among the last few that has not yet ratified.

Undersecretary Gottemoeller’s tour did not begin and end in Nevada, where the United States conducted 921 nuclear test explosions, including 100 above-ground tests, beginning in 1951, and ending with the last U.S. nuclear test in September 1992.

Instead, Gottemoeller’s trip included stops in Alaska and Colorado—