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Unidentified Sounds Observed at Pioneer Seamount
( humpback calls |fin whale calls |earthquakes |blue whale calls |ship sounds )
( American Cetacean Society )

September 2, 2001 (day 245), 4:00 UT

The downward-chirping sounds near 50 Hz are the sound in question. (The lines going clear across the spectrogram are electronic artifacts, not ocean sounds.)
August 12, 2002 (day 224), 19:15 UT

Ship-engine noise?
August 30, 2002 (day 242), 1:45 UT

A distant source?
September 3, 2002 (day 246), 0:15 UT

Signals about 65 sec long, repeated for several hours.
August 30, 2002 (day 242), 1:45 UT

A distant source.