The last major eruptions of Turrialba Volcano were
from 1864 to 1868. Of its three craters, the central one is the deepest
most active, presenting two conic structures with sulfuric steam and
OVISCORI-UNA maintains a permanent montioring station at the volcano.
Located in southeast Costa Rica, Turrialba is a large, densely forested
stratovolcano*. Three well-defined craters lie in the upper section of
a broad summit depression. Turrialba has been quiet since a series of
explosive eruptions in the 19th century that featured intermittent
pyroclastic* flows. Fumarole* activity continues at the summit craters.