sound channel sound channelan area of slow sound speed that causes sound waves to become focused at this water depth Related Articles: Glossary: sound channel axisHow fast does sound travel?CTBT Hydrophone StationHistory of the SOFAR ChannelHow is sound used to monitor nuclear testing?Sound Surveillance System (SOSUS)Sound Speed MinimumSound Travel in the SOFAR ChannelSound Channel VariabilityResources for Educators Chris Knowlton2017-02-26T20:10:01-05:00