Big Ben volcano #

Image credit: NASA., under PD

Mawson Peak (small circle in the upper center of the image), sits within a breached caldera (collapsed and empty magma chamber beneath a volcano) on the southwestern side of the volcano - the shadow cast by Mawson Peak points directly to the crescent-shaped caldera rim.

This image, taken during the Southern Hemisphere summer, also shows the dark brown volcanic rock that forms the island. The southwest-pointing tongue of ice is Gotley Glacier.