Sapas Mons

Sapas Mons

. Located in an equatorial highland called Atla Regio, the volcano Sapas Mons is about 400 thousand meters in diameter and only 1.5 thousand meters high; it is named after a Phoenician goddess. The sides of the volcano are composed of numerous overlapping lava flows from flank eruptions similar to terrestrial volcanoes such as the Hawaiian shield volcanoes. The summit contains two smooth, radar-dark mesas, as well as groups of pits, some as large as one thousand meters across. They may have formed when underground chambers of magma were drained, causing the surface to collapse above them. A 20-kilometer-diameter impact crater northeast (upper right) of the volcano is partly buried in lava flows. (Courtesy of NASA.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University