Seismic Swarm
Shakes And Rolls
Costa Rica
Wednesday was a
very active day
seismic wise, as
more than 30
tremors shook
Costa Rica, the
majority due to
a seismic swarm*
in the Irazú
volcano.
The first
registered
tremor was at
1:45pm
registering 4.0
on the Richter
scale, with an
epicentre some
25 kilometres
northwest of
Quepos, with a
depth of 58
kilometres.
The tremors were
felt in many
areas.
At the end of
the seismic
swarm a total of
32 tremors were
registered, but
only 2 of the
shakes were
felt.
*The seismic
phenomenon known
as a "seismic
swarm" is an
episode of high
earthquake
activity in
which the
largest
earthquake does
not occur at the
beginning of the
episode and in
which the
largest
earthquake is
not
substantially
larger than
other
earthquakes of
the episode.
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