Graben in Memnonia Fossae
NASA/JPL/University of Arizona

Graben in Memnonia Fossae
PSP_005376_1575  Science Theme: Other
Español



WALLPAPER

800  1024  
1152  1280  
1440  1600  
1920  2048  
2560  2880 
The linear depressions that cross this HiRISE image are geological features called "graben." In this part of Mars, graben such as these are collectively named Memnonia Fossae.

Graben can form when the ground is stretched apart due to tectonic forces and can also form when magma is injected underground along long vertical fractures called dikes. The magma forces the dikes open, causing the extension of the ground surface. Both tectonic and dike-related graben are found in Iceland, where tectonic forces both stretch apart the island and enable magmatic dikes to form.

By studying the topography of graben, scientists are able to discern between tectonic and magmatic origins. This part of Mars is especially well suited for this kind of analysis because the ground surface prior to graben formation was relatively flat, making graben-related topography easier to identify and study. Topographic analyses of graben in Memnonia Fossae has revealed that these features formed over magmatic dikes. This means that the Memnonia Fossae are indicators of underground magmatic activity, rather than regional tectonic extension. These kinds of details are key to interpreting the geologic evolution of the surface of Mars.Written by: ChrisO   (12 October 2007)



 Image Products: All image links are drag & drop for HiView, or click to download
JPEG
Grayscale: map projected  non-map
IRB color: map projected  non-map
Merged IRB: map projected
Merged RGB: map projected
RGB color: non-map projected

JP2 DOWNLOAD
Grayscale: map-projected (471.7 MB)
IRB color: map-projected (189.3 MB)

JP2 EXTRAS
Grayscale: map-projected  (219.8 MB),
non-map  (313.6 MB)
IRB color: map projected  (108.4 MB)
non-map  (273.7 MB)
Merged IRB: map projected  (548.7 MB)
Merged RGB: map-projected  (513.4 MB)
RGB color: non map-projected  (260.2 MB)

ADDITIONAL IMAGE INFORMATION
Grayscale label   Color label
Merged IRB label   Merged RGB label
EDR products

About color products (PDF)
HiView main page

 Observation Toolbox
Acquisition date:19 September 2007 Local Mars time: 2:18 PM
Latitude (centered):-22.323° Longitude (East):199.779°
Range to target site:258.5 km (161.6 miles)Original image scale range:51.7 cm/pixel (with 2 x 2 binning) so objects ~155 cm across are resolved
Map projected scale:50 cm/pixel and North is upMap projection:Equirectangular
Emission angle:0.2° Phase angle:33.0°
Solar incidence angle:33°, with the Sun about 57° above the horizon Solar longitude:316.5°, Northern Winter
For non-map projected products:
North azimuth:97° Sub-solar azimuth:8.9°
For map-projected products
North azimuth:270°Sub solar azimuth:182.8°

Context map

Usage Policy
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: Image: 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.