active system in Iceland. The activity has changed in terms of frequency and
type of eruptions with time. The period 9000-7000 years ago was dominated by effusive basaltic volcanism, the period 7000-3000 years ago was characterized by infrequent but large explosive silicic eruptions at the central volcano, and the last 3000 years have been dominated by more frequent and smaller mixed silicic
/volcanoes/about-volcanoes/hekla/hekla-eruptions/