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Works Cited
"Officials advise caution when visiting Costa Rican volcanoes, due to recent activity."
Tico Times, The (San Jose, Costa Rica) 17 Apr. 2012: Newspaper Source. Web. 5
Dec. 2012.
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Officials advise caution when visiting Costa Rican volcanoes, due to recent activity
April 17--Last Friday night, a vapor release at least 300 meters high at the Poas Volcano,
in the northwestern province of Alajuela, deposited a large quantity of ashes and rocks in
the southeastern sector of the volcano's crater.
National Seismological Network (RSN) experts on Monday visited the crater to collect
water samples from the volcano's lagoon and sulfur and sludge from inside the crater's
lake.
Earlier this month, National Emergency Commission (CNE) officials urged caution for
tourists visiting volcanoes, especially during Easter Holy Week, as five Costa Rican
volcanoes are currently in various states of activity.
According to the CNE, the active volcanoes are Rincon de la Vieja and Arenal (in the
northwestern province of Guanacaste), Irazu and Turrialba (in Cartago province, east of
San Jose) and Poas.
Poas' activity last Friday is what experts from the RSN call a phreatic eruption, also
known as a phreatic explosion or ultra-vulcanian eruption, which occurs when magma
heats ground or surface water. The extreme temperature of the magma results in an
explosion of steam, water, ash, rock and volcanic bubbles.
Turrialba earthquake not related
On Tuesday, a magnitude-3.2 earthquake near the Turrialba Volcano shook the area at
12:40 p.m., but RSN seismologist Leopold Linkimer said it was not a volcanic event. The
expert said the quake was due to movement along local fault lines at Agua Caliente and
Navarro, east of Cartago.
According to the RSN, the quake was located 4 kilometers northeast of Turrialba, near
the volcano.
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Source: Tico Times, The (San Jose, Costa Rica), Apr 17, 2012
Item: 2W61130117983