August 28, 2012 – PERU- Peruvian
geologists have revealed that recent activity at El Misti signal that
the volcano is active. Last Thursday researchers at the Geophysical
Institute of Peru (IGP) found that El Misti – located 17 km outside the
city of Arequipa – had recently recorded the highest amount of seismic
activity than in the past five years. Engineer Orlando Macedo told El
Comercio that 224 earthquakes were registered at El Misti – an event
known as an earthquake swarm – and which signaled that the volcano was
no longer dormant. El Misti, he said, experienced 143 volcano tectonic
earthquakes, which were caused by the fracture of rock inside the
volcano, due to sudden changes in pressure and temperature. Despite the
recent increase in activity, the IGP said there were still no conditions
for an eruption to occur at El Misti, which last erupted sometime
between 1450 and 1470. For an eruption to happen, Macedo said, El Misti
would have to experience continued earthquakes, which “would have to
occur after long-term movements of magma, and causing these earthquakes
known as tremors, with lava.” –Peru this week
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