This sound was recorded during the 1996 on the Equatorial Pacific Ocean autonomous hydrophone array. These calls are quite complex and variable and resemble calls reported for blue whales off Chile (Cummings and Thompson 1971). These calls were recorded on all six hydrophones but very rarely above the equator and primarily at the hydrophone at 8 S 95W. These calls were therefore classified as "southern" blue whale calls.

Click on spectrogram for full-sized image and timeseries.

356K wav file(The recorded signal has been sped up 10 times)