The activity is Strombolian-Vulcanian and continues since 1949.
Vulcanian explosions continue from the active summit crater at a rate of several tens per month.
This kind of activity has persisted, with fluctuations, since late 1955. Before, eruptions from this volcano were separated by much longer repose periods and occurred from flank eruptive centers, producing large volumes of lava together with pyroclastics, such as in 1914 and 1946. Since then, only weak fumarolic activity occurs from a few places on the newly emplaced lava dome. This activity is continuing since early 1992 but has been stronger during its first year. Minor ash emissions occurred sporadically through the end of the year, showing a small magmatic component.