Lava Flows at the Base of Olympus Mons
NASA/JPL/University of Arizona
Lava Flows at the Base of Olympus Mons
ESP_011664_2015  Science Theme: Volcanic Processes
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This image is located at the foot of the largest volcano in the Solar System, Olympus Mons.

The entire scene is covered with a multitude of lava flows. Most of the flows consisted of relatively sticky lava that froze after flowing for only a short distance (often less than a kilometer, or about half a mile). However, a few of the flows were more fluid and actually drained out of their channels, leaving troughs with distinct levees. These "channelized" flows extend out of the HiRISE image so they must be at least several kilometers (a few miles) long.

In all likelihood, both the short and long lava flows have very similar chemical compositions. Based on experience with lava flows on Earth, the channelized flows were probably fed by more vigorous eruptions. That is, the lava flow was fed so quickly that the lava traveled a long distance before it solidified. With the shorter flows, a slow dribble of lava froze before going more than the equivalent of a few city blocks.

The ridge with two knobs in the center of the image is of special interest. The lava flows radiate away from these knobs, indicating that the flows were fed from these points. However, based on experience with the current eruption of Kilauea Volcano in Hawaii, it seems that these vents were fed by a lava tube. Thus the magma first reached the surface some distance away, then was transported through a tube to this location. A blockage in the tube would force the lava to burst out and erupt onto the surface.

Written by: Laszlo Kestay   (22 April 2009)

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Acquisition date
21 January 2009

Local Mars time:
15:49

Latitude (centered)
21.246°

Longitude (East)
230.872°

Range to target site
286.3 km (178.9 miles)

Original image scale range
57.3 cm/pixel (with 2 x 2 binning) so objects ~172 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection
Equirectangular

Emission angle:
12.6°

Phase angle:
50.6°

Solar incidence angle
63°, with the Sun about 27° above the horizon

Solar longitude
195.3°, Northern Autumn

North azimuth:
96°

Sub-solar azimuth:
345.6°
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All of the images produced by HiRISE and accessible on this site are within the public domain: there are no restrictions on their usage by anyone in the public, including news or science organizations. We do ask for a credit line where possible:
NASA/JPL/University of Arizona



Postscript
For information about NASA and agency programs on the Web, visit: http://www.nasa.gov. NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, Calif., manages the Mars Reconnaissance Orbiter for NASA's Science Mission Directorate, Washington. Lockheed Martin Space Systems is the prime contractor for the project and built the spacecraft. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona. The image data were processed using the U.S. Geological Survey’s ISIS3 software.