Global Volcanism Program | Image GVP-07552
The submarine Reykjaneshryggur volcanic system, lying off the southwest tip of Iceland, is part of the Mid-Atlantic Ridge, which extends onto the Reykjanes Peninsula (foreground). A small plume of steam from geothermal activity is visible (middle left). Numerous submarine eruptions at Reykjaneshryggur dating back to the 13th century have been observed, some of which have formed short-lived islands. Submarine eruptions have been characterized by phreatomagmatic or Surtseyan explosive activity, depositing tephra on land. Subaerial eruptions have been typified by effusive activity, producing lava flows on Reykjanes Peninsula.
Photo by Oddur Sigurdsson, 1998 (Icelandic National Energy Authority).