Monitoring Earth's Subsurface from Space

摘要

Since 1945, when U.S. scientists conducted the first nuclear test, Trinity, nations have been signatories to a series of treaties designed to reduce the scope of tests and eliminate nuclear testing. For example, the Limited Test Ban Treaty in 1963 banned tests in the atmosphere, under water, and in space, and the Threshold Test Ban Treaty in 1976 established a yield limit of 150 kilotons (150,000 tons of TNT) for underground testing. The Comprehensive Test Ban Treaty (CTBT), signed in 1996, banned all nuclear tests.