Perspective view of Claritas Fossae, looking north
Science & Exploration

Fractures of Claritas Fossae

20/01/2005 893 views 0 likes
ESA / Science & Exploration / Space Science / Mars Express

These images, taken by the High Resolution Stereo Camera (HRSC) on board ESA’s Mars Express spacecraft, show Claritas Fossae, a series of linear fractures located in the Tharsis region of Mars.

Map showing Claritas Fossae in context
Map showing Claritas Fossae in context

The HRSC obtained these images during orbit 563, with a resolution of approximately 62 metres per pixel. The image shows a region centred around latitude 25° South and longitude 253° East.

Claritas Fossae is located on the Tharsis rise, south of the three large volcanoes known as the Tharsis Montes, and extends roughly north to south for approximately 1800 kilometres. The linear fractures of Claritas Fossae have widths ranging from a few kilometres to 100 kilometres, and the region is about 150 kilometres wide in the north and 550 kilometres wide in the south.

Colour view of Claritas Fossae
Colour view of Claritas Fossae

These fractures are radial to the Tharsis rise, consistent with the idea that they are the result of enormous stresses associated with formation of the 8-10 kilometre high Tharsis rise. Faults running east to west are also visible in the colour image and may have a similar origin.

In the east of the colour image, a prominent linear feature with a dark shadow is visible. This is most likely a normal fault, the eastern edge of a 100 kilometre wide ‘graben’. A graben is a block of Mars's crust which has dropped down due to an extension, or pulling, of the crust. This graben is characterised by a smooth surface and the difference in height between the edge of the graben and the plains east of the normal fault is roughly 2.3 kilometres. Alternatively, this feature may have resulted from surface collapse due to magma withdrawal.

Black and white view of Claritas Fossae
Black and white view of Claritas Fossae

The smooth surfaces in the image suggest this terrain has been resurfaced by lava flows. The observation that the lava flows have covered some of these faults, particularly in the west and north-east of the image, suggests that Claritas Fossae is older than the surrounding terrain.

The outline of a crater with a diameter of 50 kilometres is visible in the centre of the image. The softened appearance of the crater, and especially the observation that fractures extend across the crater, suggest this crater pre-dates the formation of the fractures. South of this crater, a faint outline is visible with a diameter of 70 kilometres, which may be another ancient crater.

Close-up of Claritas Fossae morphology
Close-up of Claritas Fossae morphology

West of these two craters, there is a small region with an interesting morphology, shown in the close-up image. These features seem to be weakly influenced by the north-south fractures. While the cause of emplacement of this terrain is still unclear, collapse of the surface due to the removal of subsurface ice might be responsible for these features.

By supplying new image data for Clarita Fossae, the HRSC camera allows improved study of the complex geology and history of the area. The stereo and colour capability of the HRSC camera provides scientists with the opportunity to better understand the Red Planet’s morphology, the evolution of rocks and landforms, and helps to pave the way for future Mars missions.

Claritas Fossae in 3 D
Claritas Fossae in 3 D

The colour images were processed using the HRSC nadir (vertical view) and three colour channels. The perspective views were calculated from the digital terrain model derived from the stereo channels.

The 3D anaglyph image was created from the nadir channel and one of the stereo channels. Stereoscopic glasses are needed to view the 3D image. Image resolution has been decreased for use on the internet.

Perspective view of Claritas Fossae, looking south-east.
Perspective view of Claritas Fossae, looking south-east.

For more information on Mars Express HRSC images, you might like to read our updated 'Frequently Asked Questions'.

Related Links

Perspective view of Claritas Fossae, looking north
Science & Exploration

Fractures of Claritas Fossae

20/01/2005 893 views 0 likes
Read
Perspective view of Candor Chasma, looking north-west
Science & Exploration

Walls of Candor Chasma

22/12/2004 2559 views 4 likes
Read
Perspective view of Reull Vallis, looking south-east
Science & Exploration

The channels of Reull Vallis

07/12/2004 1438 views 2 likes
Read
Crater Hale in Argyre basin
Science & Exploration

Crater Hale in Argyre basin

24/11/2004 8810 views 0 likes
Read
Colour view of Coprates Catena
Science & Exploration

Coprates Catena’s ‘collapsed’ structures

17/11/2004 1650 views 2 likes
Read
Phobos in colour, close-up
Science & Exploration

Martian moon Phobos in detail

11/11/2004 3506 views 8 likes
Read
Tithonium Chasma
Science & Exploration

Tithonium Chasma, Valles Marineris, on Mars

03/11/2004 1305 views 0 likes
Read
Colour view of Huygens crater rim
Science & Exploration

Rim of Crater Huygens on Mars

19/10/2004 2396 views 3 likes
Read
Martian 'dust devil' tracks
Science & Exploration

Promethei Terra, southern highlands of Mars

12/10/2004 1845 views 1 likes
Read
Claritas Fossae and Solis Planum, looking north
Science & Exploration

The grabens of Claritas Fossae

05/10/2004 1542 views 3 likes
Read
Colour image of Ophir Chasma
Science & Exploration

Ophir Chasma, part of Valles Marineris

27/09/2004 1479 views 1 likes
Read
Perspective view of Solis Planum, looking south-east
Science & Exploration

Solis Planum, Thaumasia region

10/09/2004 2278 views 1 likes
Read
The southern part of Valles Marineris, called Eos Chasma
Science & Exploration

Eos Chasma, part of Valles Marineris

30/08/2004 2090 views 3 likes
Read
Crater dunes
Science & Exploration

Crater dunes in Argyre Planitia

23/08/2004 2704 views 1 likes
Read
Colour image of Dao and Niger Valles
Science & Exploration

The eroded valleys of Dao and Niger Valles

16/08/2004 1457 views 2 likes
Read
The High Resolution Stereo Camera (HRSC)
Science & Exploration

Behind the lens...

13/02/2004 2251 views 3 likes
Read