Global Volcanism Program | Image GVP-05997
The Námafjall hyaloclastic ridge, formed as a result of subglacial eruptions, cuts diagonally across the foreground of the photo, with Myvatn lake in the distance to the SW. Steam rises above the Krafla geothermal development at the lower right. The Námafjall fumarole field has been in existence for at least 11,000 years. Fumarolic activity is concentrated along N-S-trending fissures.
Photo by Michael Ryan, 1984 (U.S. Geological Survey).