After a month or so (?) of unrest under Keilir on Reykjanes peninsula, last night there was finally an eruption. A roughly half-km long fissure opened in Geldingadal ("valley of the castrated"). How will it play out? How far will lava flows reach? Reykjanes peninsula is the most densely populated part of Iceland, though this is relatively far inland and in a valley that will limit spillover.