Pit Chains and Concentric Fractures at the Summit of Tyrrhena Patera
NASA/JPL/UArizona
Pit Chains and Concentric Fractures at the Summit of Tyrrhena Patera
PSP_006487_1580  Science Theme: Fluvial Processes
This image was suggested by Ehsan Sanaei's high school astronomy club in Yazd, Iran.

They noticed a set of craters around the rim of Tyrrhena Patera. Tyrrhena Patera is a volcano in the southern highlands with shallow slopes, and only 2 kilometers (1.2 miles) of vertical relief. The craters are aligned and are known as pit crater chains. These are common in volcanic regions on Mars.

They are not formed by a meteorite impact, but by collapse into some void space underground. Because the pit crater chains and concentric fractures are generally aligned, these are most likely due to extension in the region, where parts of the Martian crust pull apart during growth of the volcano or emplacement of dikes.

Another way pit crater chains can occur is when lava tubes partially collapse forming chains of holes along the roof of the lava tube. A third possibility is that these may be associated with collapse of the magma chamber.

Written by: Alix Davatzes  (12 November 2008)
 
Acquisition date
14 December 2007

Local Mars time
14:28

Latitude (centered)
-21.857°

Longitude (East)
106.682°

Spacecraft altitude
253.1 km (157.3 miles)

Original image scale range
25.3 cm/pixel (with 1 x 1 binning) so objects ~76 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
0.2°

Phase angle
43.1°

Solar incidence angle
43°, with the Sun about 47° above the horizon

Solar longitude
2.6°, Northern Spring

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  32.8°
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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.