AFTER WHAT HAS been a quiet 2015, Etna saw one of its first paroxysms of the year. Over the last few weeks, the Voragina crater on Etna has been restless, with low level Strombolian activity that was mainly confined to the crater. However, last night, the Voragine crater unleashed a lava fountainthat reached 1 kilometer (~3,200 feet) over the volcano with an accompanying ash plume that topped 3 kilometers (~9,800 feet). Even with all that intensity of eruption, the paroxysm was over in only 50 minutes.
This was Etna’s first significant eruption since May 2015, when the activity was centered at the New Southeast Crater, but the Voragine Crater had been sputtering lava occasionally since the start of the year.
Quick post today, but RUV is reporting that three small explosions occurred in the area just north of Vatnajökull. The nature of the explosions are unknown at this point, but from the rough translation of the article in Icelandic, they sound an awful lot like a phreatic explosion — that is, explosions driven by steam. If magma is directly involved, they would then become phreatomagmatic. In both cases, it could be a case where intruding basalt is interacting with saturated sediment at the edges of the Vatnajökull.