Western Pacific blue whale calls have been recorded primarily
in the northwestern Pacific but also north of Hawaii and in
the offshore northeast Pacific (Thompson and Friedl 1982, Stafford
and Fox 1996). They are generally a one to two-part frequency
modulated moan that lasts about 20s with frequencies from 23
to 20 Hz.
for full-sized image.
recorded signal has been sped up 10 times)