Bruce Murray Space Image Library
Zamama, a volcano on Io
The lava for this flow field erupts from a small shield volcano 40 kilometers wide and 1.5 kilometers tall. The peak of this volcano is surrounded (as you can see in the image on the right) by radiating lava flows. Flows to the south of the Zamama volcano are incised into the plains as well as the flanks of a shield volcano southeast of Zamama. A volcanic plume has been observed erupting from the center of the Zamama flow field, caused by the heating of sulfur dioxide surface frost by flowing silicate lava.