Pancake domes on Venus

Pancake domes on Venus

Fig. 2.31 . These seven volcanic domes were discovered in radar images of Venus taken from the Magellan orbiter. They all have round shapes that are about 25 kilometers across, and steep sides that are less than 750 meters high. Their central vents may be lined up along a crack in the surface. These domes are attributed to very thick, stiff and sluggish lava flows, rather than the fluid and runny type. Eruptions of the pasty, viscous lava, coming from a central vent on a relatively level surface, would form the circular, flattened shapes that resemble giant pancakes. Since there is little or no erosion by wind or water on Venus, newer pancakes look much the same as the ones on which they are superimposed. (Courtesy of NASA/JPL.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University