If you're in Iceland this week, the forecast is for a very strong indication of magma movement east of Bárðarbunga caldera. Seriously. In English, that means Iceland’s Bárðarbunga volcano could be about to blow. On Tuesday, authorities in Iceland raised the volcano alert level for air travel over the region to the second-highest level on the scale. That followed a big uptick in the intensity of seismic activity near Bárðarbunga that started on August 16. The number of small earthquakes in the region is growing, which is a possible precursor to volcanic activity, says Bloomberg reporter Omar Valdimarsson in Reykjavik. Such rumblings are fairly ordinary in Iceland. But there are concerns that this eruption could be huge if it happens. Bárðarbunga is Iceland’s largest volcano and sits under Europe’s largest glacier. That means the intensity of an eruption would depend not just on whether the magma beneath the volcano reaches the surface, but where. “If it reaches the surface underneath t
