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Today's VIS image crosses part of the flank of Tyrrhenus Mons. Tyrrhenus Mons is one of the oldest martian volcanoes. Unlike most of the other Martian volcanoes, it is made of layers that include softer volcanic ash rather than just basaltic flows. This difference is evident in how the volcano is being eroded, creating broad intersecting sinuous channels. Tyrrhena Fossae, the largest of the channels dissecting the volcano, is visible in this image.

On Earth basaltic flows form broad shield volcanoes like Hawaii. Shield volcanoes can erupt from the central crater, as well as along the flanks. Volcanoes with ash layers, called composite volcanoes, form steeper sides like Mt Rainier and Mt Fuji, with material erupting only from the central caldera. Tyrrhenus Mons more closely resembles composite volcanoes.

Orbit Number: 93105 Latitude: -21.2039 Longitude: 107.185 Instrument: VIS Captured: 2022-12-10 12:51

Please see the THEMIS Data Citation Note for details on crediting THEMIS images.

NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Science Mission Directorate, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.