Global Volcanism Program | Image GVP-05998
The Hverfjall eruptive cycle began about 2600 years ago with the formation of the prominent basaltic Hverfjall tuff ring (foreground) east of Myvatn lake. Hverfjall tuff ring, the largest of the Krafla volcanic system, has a height of about 150 m and is about 1-km wide. Lava-dammed Myvatn, in the background to the west, is Iceland's fourth largest lake. It provides premier wildlife habitat that is renowned for its diversity of bird life, particularly duck species.
Photo by Michael Ryan, 1984 (U.S. Geological Survey).