Sirenum Fossae Troughs
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows two troughs/depressions formed along the trend of the Sirenum Fossae, a suite of very extensive troughs formed by faults that are radial to the giant Tharsis Bulge. As the Tharsis region bulged outward, adjacent terrain expanded and formed a series of long, extensional fault systems.
Location near: 26.4Â°S, 142.4Â°W
Image width: ~3 km (~1.9 mi)
Illumination from: lower left
Season: Southern Spring