So lava was flowing quite fast,' Halldor Geirsson ... On that occasion, hundreds of tremors damaged buildings and opened up huge cracks in roads. The quakes were followed by a volcanic fissure ...

In a non-explosive eruption, like those that happen at Hawaii's volcanoes, lava fountains or oozes from cracks in the ground. The lava in these types of volcanoes doesn't contain much dissolved ...

shows two eruptive vents actively fountaining from the floor of Haleumaumau Crater as newly emplaced lava flows exhibit intense heat shimmer and residual glow in some of their cracks at the summit ...