~
;l>
8
r::
~
(i'
g
3
3
r::
t:l
§'
'*
0'
t:l
5'
~
' "
0f'>
'" t:l
0o
e.
"0
::r
5'
f'>
10
10
8
8
6
Time in seconds
4
4
6
~~~"""'~' • •
~""V-'
2
2
N
40
t:
III
:I:
30
.!:
~ 20
c
III
::I
go 10
...
LL
~
0
r
> 10
E
.=
0
~
::I
::l 10
l!!
Q.
I0
FIGURE
4.16. Waveform and spectrogram illustrating two low-frequency (nominally 20Hz) pulses of fin whales,
Balaenoptera physalus.
These two fin pulses were recorded in the North Atlantic. The signal-to-noise ratio from the actual pulses at 1 to
IV
2s and 9 to lOs is good. One can also see echoes from reverberation of the pulses between 4 and 5s.
~