[9] It consists as is usual for such subglacially formed volcanoes, of pillow lavas under a layer of phreatomagmatic tephra (hyaloclastite).

"[6] In the following time, these edifices grew and developed further by subaqueous density currents and resuspense resp.

[6] The tuff cones and ridges grew and merged, but they also enclosed a source of jökulhlaup in between them, inter-ridge meltwater catchments with volumes of up to 15 000 000 m3.

[6] Especially in two areas, geothermal activity at Sveifluháls is intense and connected to Krysuvík volcanic system.

Hydrothermal alteration and this heat lead to precipitation of minerals like hematite, goethite and different sulfur compounds.

[10] There is also the possibility to hike from Vatnsskarð (Reykjanes) [ˈvasːˌskarθ] up on Sveifluháls and follow the ridge to the highest summit Stapatindur [ˈstaːpaˌtʰɪntʏr̥].