New Views of Volcanism on Mars: Recent Observations and Computer Simulations

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3210 Modeling, 5464 Remote Sensing, 8429 Lava Rheology And Morphology, 8450 Planetary Volcanism (5480)

Scientific paper

The Mars Global Surveyor spacecraft has provided an unprecedented new view of Mars in general, and of volcanism on Mars in particular. The Mars Orbiter Camera (MOC) has obtained thousands of images showing the texture and relief of Martian volcanic terrain at scales down to the 1.4 m/pixel resolution of the mapping images. These new images have not changed many of the Viking-based interpretations of the origin of individual volcanic constructs (Mons, Tholus, Patera, etc.), but they have revealed an abundance of new detail about lava flows and other volcanic deposits on the planet. The Mars Orbiter Laser Altimeter (MOLA) has quantified the relief of the Martian surface with precision down to the 30-50 cm vertical accuracy of the individual MOLA measurements. MOLA data have shown that surface gradients and slope orientations based on Viking data are sometimes in serious error, which can affect interpretations of how lava flows become emplaced on the planet. MOLA data have recently revealed the first strong evidence for lava tubes on Mars, to add to the channelized flows observed since Mariner 9. MOLA data also provide new Digital Elevation Model (DEM) representations of the Martian surface over which computer-simulated lava flows can be emplaced. We have carried out preliminary simulations of flow emplacement in the Tharsis Montes area of Mars on released MOLA DEM data, which are providing new insights into the likely conditions present when the lava flows were emplaced in this area. As more detailed MOLA data are released, we will refine these early simulation results.

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