sound channel an 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 StationSound Speed MinimumSound Surveillance System (SOSUS)Sound Travel in the SOFAR ChannelSound Channel VariabilityHistory of the SOFAR ChannelResources for EducatorsTutorial: Speed of Sound Chris Knowlton2017-02-26T20:10:01-05:00