Troughs and Scarps in Planum Australe
Troughs and Scarps in Planum Australe
ESP_012934_1070  Science Theme: Polar Geology
This image shows an outcrop of the south polar layered deposits (SPLD). The SPLD consist of layers of ice and admixed dust and make up the bulk of the dome-shaped Planum Australe.

Planum Australe is, in some ways, analogous to the Antarctic ice sheet. Troughs and scarps carved into Planum Australe by erosional processes have exposed SPLD layers within it. In this image, the darkest area at the bottom of the image is the bottom of the scarp. Except for the dark material at the bottom of the slope, much of the changes in brightness in this image are due to the lighting angle, the direction from which the sun is illuminating the slope.

Much like ice cores from Greenland and Antarctica and deep sea sediment cores, the icy-dusty layers of the SPLD may have preserved a record of recent Mars climate history. Understanding that record is a complex process and involves, among many other types of analyses, examining the differences and similarities in appearance between each layer and attempting to classify layer types. This image shows nice examples of different layer textures. But what is especially interesting about this image are the faults cutting through the layers. These faults appear as diagonal lines, on either side of which, the layering is offset. Note that the faults are not clean, single lines, but appear in long groups of short lines.

What caused these faults is still under investigation, but, among other possibilities, they could be related to an earlier time when temperatures were higher and the ice was flowing at a much faster rate than it is today.

Written by: Kathryn Fishbaugh  (22 July 2009)

This is a stereo pair with ESP_013066_1070.
Acquisition date
30 April 2009

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
249.1 km (154.8 miles)

Original image scale range
24.9 cm/pixel (with 1 x 1 binning) so objects ~75 cm across are resolved

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25 cm/pixel

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Solar incidence angle
57°, with the Sun about 33° above the horizon

Solar longitude
256.7°, Northern Autumn

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North azimuth:  101°
Sub-solar azimuth:  34.8°
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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. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona.