Troughs in Elysium Fossae
NASA/JPL/UArizona
Troughs in Elysium Fossae
ESP_044884_2050  Science Theme: Tectonic Processes
The two linear depressions in this image form part of the Elysium Fossae complex, a group of troughs located in the Elysium quadrangle of Mars.

These troughs are tectonic features, likely formed by the stretching, tearing and subsequent collapse of the crust resulting from the rise of the nearby Elysium volcanic province. The north and south troughs in this image are roughly 4.8 and 3.7 kilometers across respectively, and around 800 meters deep. Strata, or layering from successive deposition of material (likely ash and lava), are exposed in the upper wall of the trough.

Upon closer inspection, another interesting phenomenon becomes visible: slope streaks. Observable on the slopes of both troughs, these dark features (also known as dust avalanches) are the result of a mass movement of loose, fine-grained material exposing darker material. Over time, these features superpose and cross-cut one another, manifesting as light-toned angular features on either side of the slope streak. Slope streaks have also been known to form as the result of an impact on or near the slope which shakes loose dust, triggering an avalanche.

Written by: Ian Pritchard, Livio Tornabene, Eric Pilles and Christy Caudill (narration: Tre Gibbs)  (4 May 2016)
 
Acquisition date
22 February 2016

Local Mars time
15:04

Latitude (centered)
24.567°

Longitude (East)
139.700°

Spacecraft altitude
283.4 km (176.2 miles)

Original image scale range
56.7 cm/pixel (with 2 x 2 binning) so objects ~170 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
0.3°

Phase angle
41.9°

Solar incidence angle
42°, with the Sun about 48° above the horizon

Solar longitude
112.8°, Northern Summer

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  13.8°
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POSTSCRIPT
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.