The
1940
El
Centro
earthquake
struck
on
18
May
1940,
due
to a
rupture
of
the
Imperial
Fault,
and
was
the
strongest
recorded
earthquake
to
hit
the
Imperial
Valley.
The
main
earthquake
happened
at
9:35pm
local
time
(magnitude
7.1
on
the
Richter
scale,
intensity
X),
with
a
strong
secondary
quake
at
10:51pm
(magnitude
5.5
on
the
Richter
scale,
intensity
IX).
 Accelerogram
data
file
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