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Report on Turrialba (Costa Rica) — 15 April-21 April 2015


Turrialba

Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 15 April-21 April 2015
Managing Editor: Sally Sennert.

Please cite this report as:

Global Volcanism Program, 2015. Report on Turrialba (Costa Rica) (Sennert, S, ed.). Weekly Volcanic Activity Report, 15 April-21 April 2015. Smithsonian Institution and US Geological Survey.

Weekly Report (15 April-21 April 2015)

Turrialba

Costa Rica

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

All times are local (unless otherwise noted)


The Washington VAAC reported that ash emissions from Turrialba were visible in the webcam on 20 April; weather clouds prevented ash detected in satellite images. Images later that day showed steam plumes with minor ash content.

Geological 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 IrazĂș volcano overlooking the city of Cartago. The massive edifice covers an area of 500 km2. Three well-defined craters occur at the upper SW end of a broad 800 x 2200 m summit depression that is breached to the NE. Most activity originated from the summit vent complex, but two pyroclastic cones are located on the SW flank. Five major explosive eruptions have occurred 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.

Source: Washington Volcanic Ash Advisory Center (VAAC)