Costa Rica's Turrialba Volcano More Active Experts Notice

Sunday 26 June 2011

The Turrialba volcano has been more active in recent days, spewing out greater emission of gases and with sound that appears similar to a jet engine.
"The gas column is more abundant, the noise is more noticeable in parts that were it is not usual", said Eliecer Duarte, volcanologist for the OVSICORI.
Duarte and other specialists visited the colossus on Thursday and found that the lake that formed in the western crater "blocked" the escape of gas which means they now soar over the entire crater.
"It is a process we have not seen before. The gases are distributed by sector but now gas is emanating 360-degrees around the crater", said Duarte.

INSIDECOSTARICA.COM | COSTA RICA  NEWS |     Sunday 26 June 2011

http://www.insidecostarica.com/dailynews/2011/june/26/costarica1106...

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TURRIALBA Costa Rica 10.025°N, 83.767°W; summit elev. 3340 m

http://www.volcano.si.edu/reports/usgs/#turrial

OVSICORI-UNA reported that on 9 June scientists conducting fieldwork at Turrialba observed a new crater lake in the W crater, which opened in January 2010 and was the center of the most recent activity. Since February, rock landslides along with abundant mud and clay had accumulated in the bottom of the crater, blocking the vent. Meteoric water from rains starting in May had formed a light-green-colored lake that was 70 by 70 m and about 1 m deep. Minor bubbling in the SW and NE shores was noted, and steam and sulfur dioxide gas emissions rose from many fumarolic vents around the crater.

Geologic Summary. Turrialba, the easternmost of Costa Rica's Holocene volcanoes, is a large vegetated basaltic-to-dacitic stratovolcano located across a broad saddle NE of Irazú volcano overlooking the city of Cartago. The massive 3340-m-high Turrialba is exceeded in height only by Irazú, covers an area of 500 sq km, and is one of Costa Rica's most voluminous volcanoes. Three well-defined craters occur at the upper SW end of a broad 800 x 2200 m wide summit depression that is breached to the NE. Most activity at Turrialba originated from the summit vent complex, but two pyroclastic cones are located on the SW flank. Five major explosive eruptions have occurred at Turrialba during the past 3500 years. Turrialba has been quiescent since a series of explosive eruptions during the 19th century that were sometimes accompanied by pyroclastic flows. Fumarolic activity continues at the central and SW summit craters.

Map

Source: Observatorio Vulcanológico y Sismológico de Costa Rica-Universidad ...

Turrialba Information from the Global Volcanism Program

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http://www.volcano.si.edu/world/volcano.cfm?vnum=1405-07=

Turrialba, the easternmost of Costa Rica's Holocene volcanoes, is a large vegetated basaltic-to-dacitic stratovolcano located across a broad saddle NE of Irazú volcano overlooking the city of Cartago. The massive 3340-m-high Turrialba is exceeded in height only by Irazú, covers an area of 500 sq km, and is one of Costa Rica's most voluminous volcanoes. Three well-defined craters occur at the upper SW end of a broad 800 x 2200 m wide summit depression that is breached to the NE. Most activity at Turrialba originated from the summit vent complex, but two pyroclastic cones are located on the SW flank. Five major explosive eruptions have occurred at Turrialba during the past 3500 years. A series of explosive eruptions during the 19th century were sometimes accompanied by pyroclastic flows. Fumarolic activity continues at the central and SW summit craters.

The summit crater complex of Turrialba volcano is seen here from the north, with the Central Valley of Costa Rica in the background. Three well-defined craters can be seen at the upper SW end of a broad 800 x 2200 m wide summit depression that is breached to the NE. Turrialba has been quiescent since a series of explosive eruptions during the 19th century that were sometimes accompanied by pyroclastic flows. Hydrothermally altered ground can be seen at the central and SW summit craters (right), where fumarolic activity continues.

Photo by Federico Chavarria Kopper, 1999.

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Unrest at Turrialba Volcano, Costa Rica

http://en.wikipedia.org/wiki/File:Unrest_at_Turrialba_Volcano,_Cost...

* Description: English: Turrialba Volcano, located in central Costa Rica, emits a translucent plume of volcanic gases in this natural-colour satellite image. The barren summit region of the 3,340-meter high Turrialba appears grey and brown, while the volcanic plume is a hazy blue. Fields and pastures are light green, in contrast to dark green forest that covers the high-elevation ridges. Since 2007, frequent acid rain showers caused by activity at the volcano killed or damaged much of the vegetation to the south-west of the summit, leaving the area brown and orange.

* Date: 28 January 2010

* Source: NASA Earth Observatory

* Author: Robert Simmon

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See also:

* Costa Rica's Poas Volcano increases activity, from The Watcher's; Posted by Cynthia Henrich on May 28, 2011 

http://poleshift.ning.com/profiles/blogs/costa-ricas-poas-volcano

* Costa Rica's Arenal volcano erupts; Posted by khan on May 25, 2010

http://poleshift.ning.com/profiles/blogs/costa-ricas-arenal-volcano

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Comment by Malou (Marie Louise) Geleff on June 28, 2011 at 8:36am
Comment by Selim KARABIYIK on June 28, 2011 at 12:27am
Thanks Kojima. It is obvious that the crust has been breaking all around the world and the trapped gasses and liquids are finding their ways out somehow.

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