volcano eruption lava magma molten plume basalt caldera earthquake fissure dome vent gas ash crater mantle shield strato iceland fagradalsfjall geldingadalir geldingadalur grindavík keflavík reykjanes reykjavík ísland nátthagi nátthaga natthagi mblis mbl.is bob dalir dalur fagradalshraun fjall flow geldingadalir volcano
grindavik keflavik reykjavik hraun icelandic iceland volcano
langihryggur live meradalir meradalur nar natthagi peninsula rag reykjanes sif volcanic panorama