Abstract
With the adoption of the 1996 Comprehensive Nuclear-Test-Ban Treaty, a global International Monitoring System of 321 monitoring stations is being deployed around the world. Three of the four types of sensors used by these stations are acoustical in nature. Seismic, hydroacoustic, infrasonic, as well as radionuclide sensors are used to detect banned underground, underwater, and atmospheric nuclear tests. The infrasonic sensors are arrays 1 to 3 kilometers across to lower their sensitivity to noise from the wind. They can detect nuclear blasts thousands of kilometers away, but they also detect some background events that are interesting too: meteorites, explosive volcanoes, supersonic aircraft, and reentering space debris.
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