The last major eruptions of Turrialba Volcano were
from 1864 to 1868. Of its three craters, the central one is the deepest and
most active, presenting two conic structures with sulfuric steam and vapors.
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.
