During the 1996 Gjálp eruption an approximately 6 km long subglacial tindar (hyaloclastite ridge) formed in a mostly subglacial fissure eruption beneath the Vatnajökull ice cap.
Í Gjálpargosinu 1996 hlóðst upp móbergshryggur á um 6 km langri gossprungu undir Vatnajökli.