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Latest news from Turrialba volcano:

Sunday, Nov 16, 2014
Another ash eruption, but significantly smaller than the one from 29 Oct, occurred last Friday at 13:46 local time. ... [more]
Costa Rica’s Turrialba Volcano erupts, as seen from 14,000 feet at 8:29 a.m. on Oct. 30, 2014. (OVSICORI-UNA, via The Tico Times)
Saturday, Nov 01, 2014
According to the National Seismological Network (RSN), the sudden eruption of Turrialba last Wednesday night was the volcano’s largest in 150 years. Costa Rica-based online-newspaper ‘The Tico Times’ reports that it was a massive phreatic explosion that spewed out ash, rocks and possibly magma. Experts from the University of Costa Rica (UCR) and National University (UNA) reported increased seismic activity on Wednesday afternoon, culminating in explosive activity at 11:10 p.m. with the ash cloud from the explosion reaching several hundred meters. ... [more]

Turrialba volcano

Stratovolcano 3340 m (10,958 ft)
Costa Rica, 10.03°N / -83.77°W
Current status: erupting (4 out of 5)
Turrialba webcams / live data
Last update: 16 Nov 2014 (occasional ash emissions)
Typical eruption style: Explosive.
Turrialba volcano eruptions: 1723(?), 1847(?), 1853, 1855, 1861(?), 1864-65, 1866, 2010 (Jan 4) - ongoing Turrialba volcano seen from Irazu No recent earthquakes
TimeMag. / DepthDistanceLocation
Turrialba (3340 m) is the easternmost of Costa Rica's active volcanoes. It is a large stratovolcano with a complex of 3 summit craters and its flanks mostly covered by farmland and forest. vegetation. After its previous eruption in 1866, signs of unrest started in 2006 and new phreatic activity began on Jan 4, 2010.

Background:

Turrialba is the easternmost of Costa Rica's active volcanoes and a large vegetated basaltic-to-dacitic stratovolcano. It is located opposite Irazú volcano, both being separated by a broad saddle.
Together with Irazú, Turrialba is one of Costa Rica's largest volcanoes. During the past 3500 years in prehistoric times, it has had at least 5 larger explosive eruptions. The top of Turrialba has 3 craters at the upper SW end of a broad 800 x 2200 m wide summit depression breached to the NE.
Eruptions from Turrialba occurred mostly from the summit craters, although two flank cones are found on the SW flank. During the 19th century, a few eruptions occurred that produced pyroclastic flows. Since an eruption in 1866 and until 2006, Turrialba was quiescent, but showed strong fumarolic activity at the central craters.
Since 2006, increased fumarolic and seismic activity were noted. On Jan 4, 2010, two new vents that later merged into a fissure aligned along the tectonic trend of the summit area opened in its western crater and started to erupt large amounts of sulphur dioxide gas and occasional lithic ash. This phreatic activity was accompanied by strong tremors and continued for a few days, but declined since Jan 8. Ash fall in the surroundings of the volcano and acid rain caused damage to agriculture and prompted evacuation of about 30 inhabitants living in the immediate vicinity of the volcano.



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