Ancient Martian volcano Ceraunius Tholus

Ancient Martian volcano Ceraunius Tholus

Fig. 8.16 . The Tharsis region of Mars includes both volcanic and tectonic features. This Viking 1 image portrays the shield volcano, Ceraunius Tholus ( right), which is 115 kilometers in diameter. A two-kilometer wide channel extends from the summit caldera down the flanks of the volcano through a crater and into the adjacent plains. Smaller channels are just visible elsewhere on the flanks. The surrounding region (left) includes intensely fractured terrain. These structures are probably related to the uplift of the Tharsis region, causing fracturing and faulting. The term tholus means "small domical mountain or hill," and ceraunius means "thunderclap." Ceraunius Tholus is named for the Ceraunii Mountains on the coast of Epirus, Greece. (Courtesy of NASA/JPL.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University