NASAA Virtual Tour of Mars

Olympus Mons, the largest volcano in the solar system. The caldera sits 24 km above the Martian surface. The shield of the volcano is 550 km in diameter and several kilometers above the surrounding terrain. This volcano is the youngest on the planet an it is believed to be no older than 300 million years.

Ascraeus Mons. This volcano sits on an apparent northeast-southwest fracture zone on the Tharsis bulge along with Pavonis Mons and Arsia Mons. The Tharsis bulge is a broad uplifted region on Mars from which radial surface fractures extend for thousands of kilometers. There has been a large amount of volcanic activity within this gently sloping region. The summit of this feature sits at 10-11 km above the Martian datum and a conservative estimate of its diameter is 5500 km.

Pavonis Mons, another volcano on the flanks of the Tharsis bulge.

Arsia Mons, the southwestern member of the Ascreaus Mons, Arsia Mons, Pavonis Mons trio which sit on the flanks of the Tharsis bulge.

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Questions and comments about this page should be addressed to:
Dr. David R. Williams,, (301) 286-1258
NSSDCA, Mail Code 690.1, NASA/Goddard Space Flight Center, Greenbelt, MD 20771


Page Author: Malcolm J. Shaw,
NASA Official: Dr. Ed Grayzeck,
Last Updated: 20 March 2001, DRW