<s>
A	O
wavenumber	B-Application
–	I-Application
frequency	I-Application
diagram	I-Application
is	O
a	O
plot	B-Application
displaying	O
the	O
relationship	O
between	O
the	O
wavenumber	O
(	O
spatial	O
frequency	O
)	O
and	O
the	O
frequency	O
(	O
temporal	O
frequency	O
)	O
of	O
certain	O
phenomena	O
.	O
</s>
<s>
In	O
the	O
geosciences	O
,	O
especially	O
seismic	O
data	O
analysis	O
,	O
these	O
plots	O
also	O
called	O
f	O
–	O
k	O
plot	B-Application
,	O
in	O
which	O
energy	O
density	O
within	O
a	O
given	O
time	O
interval	O
is	O
contoured	O
on	O
a	O
frequency-versus-wavenumber	O
basis	O
.	O
</s>
<s>
On	O
the	O
other	O
hand	O
,	O
the	O
group	O
velocity	O
is	O
equal	O
to	O
the	O
slope	O
of	O
the	O
wavenumber	B-Application
–	I-Application
frequency	I-Application
diagram	I-Application
:	O
</s>
