Turrialba and
Poás Volcano
Remain Active
Although the
Turrialba and
Poás volcanoes
continue with
high activity,
experts assure
that this is
normal behaviour.
Since early
Monday morning
both volcanoes
began expelling
a huge column of
gas and steam.
The
Obvservatorio
Vulcanológico y
Sismológico de
Costa Rica (OVSICORI)
explains that
the Poás since
December has
made 12 phreatic
eruptions
without causing
major problems
for nearby
communities.
For its part,
the Turrialba
has been more
active in the
past couple of
months, but only
causing damage
to crops of
nearby farms.
Click here
for LIVE fotos
of the Turrialba
volcano
Phreatic
Eruption
A phreatic
eruption, also
called a
phreatic
explosion or
ultravulcanian
eruption, occurs
when rising
magma makes
contact with
ground or
surface water.
The extreme
temperature of
the magma
(anywhere from
600 to 1,170 °C
(1,112 to 2,138
°F)) causes
near-instantaneous
evaporation to
steam resulting
in an explosion
of steam, water,
ash, rock, and
volcanic bombs.
Phreatic
eruptions
typically
include steam
and rock
fragments; the
inclusion of
lava is unusual.
A scheme of a
Phreatic
eruption.
Source:
Wikipedia.org
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