The inset permits a greater appreciation of the structure of Olympus Mons, especially the caldera and the scarp. The caldera probably formed as a result of recurrent collapse following drainage of magma out of the central conduit of the volcano during flank eruptions. The floor of the deepest caldera is featureless at this resolution, but the floor materials of other parts of the caldera complex are marked by fault patters and ridges similar to mare ridges on the Moon. Fluting of the caldera walls suggests landslide activity. The large image is about 700 km across.
North is to the top of the large image and to the right of the inset.