Summit caldera of Olympus Mons

Summit caldera of Olympus Mons

. The summit region of Olympus Mons contains nested caldera pits, radiating lava-flow texture, and broad flow terraces. The crater-like pits have been formed by repeated collapses after eruption, each one marking the point where lava has withdrawn from a chamber within the volcano. The largest collapse center in this Viking image is about 25 kilometers across and nearly 3 kilometers deep. (Courtesy of NASA and JPL.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University