Mars - Mariner 9
Central caldera of Olympus Mons on Mars
Mariner 9 image of the central caldera of the Martian
volcano, Olympus Mons. The basic morphology is similar
to terrestrial calderas, although the scale is much larger.
The smallest (and youngest) collapse pit, at right,
is 30 km across. Concentric fractures and terrace are
visible in the larger parts of the caldera. The caldera
is about 29 km above the mean Martian surface.
North is at 7:00.
(Mariner 9, MTVS 4265-52)