NASAA Virtual Tour of Mars

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.

Tharsis Tholus; also on the Tharsis bulge.

Ceranius Tholus (lower right) and Uranius Tholus (above Ceranius). The fractures at left are known as Ceranius Fossae; they extend radially from 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: 15 January 1999, DRW