background image NOAAVents ProgramAcoustics Program
  Monitoring the global ocean through underwater acoustics
non-clickable go to Acoustics home non-clickable scroll down for Methods non-clickable scroll down for Results non-clickable scroll down for Multimedia non-clickable
non-clickable non-clickable non-clickable non-clickable
  NOAA Ship Ron Brown approaching hydrophones sound  

bloop spectrogramExample of "blade noise" from a large oceanographic vessel. The spectrograms show the acoustic signature of the NOAA Ship Ronald H. Brown as it approaches five different hydrophone sites in the equatorial Pacific Ocean. The spacing of the blade lines is generally consistent in each example. Acoustic signatures are routinely used by the military to identify ship characteristics, class, and often individual vessels.


Click on spectrogram for full-sized image.

bloop sound841KB wav file(The recorded signal has been sped up 10 times) 

Vents Home Contacts-Credits Bibliography Links Disclaimer Privacy Policy