Mars Global Surveyor
Mars Orbiter Camera
Valleys on Northwest Flank of Alba Patera Volcano
MGS MOC Release No. MOC2-92, 16 March 1999
In 1972, Mariner 9 images revealed a variety of branched and
networked valleys on Alba Patera, a volcano in northern Tharsis.
Since then, the question has always been, "what made these valleys,
water or lava?" Because the Alba Patera volcano was considered to be
a relatively young feature on Mars, it seemed that if water was
involved in the formation of the valleys, then it would imply that
liquid water flowed on this part of Mars at a relatively recent time
in the planet's history. Thus, it was hoped that Mars Global Surveyor
(MGS), with its super-high resolution Mars Orbiter Camera (MOC), would
help answer this key question about evidence for past water on the red
However, when MOC peered down upon these valleys it became clear that
the camera might not help answer the question of their origin. As the
picture above shows, these valleys--which trend from lower right to
upper left in the picture--are old and have been cut by younger
faults that created graben--e.g., the wide, straight valley running
diagonally from upper right to lower left. Worse, the close-up views
revealed that the valleys are covered up by a lumpy-textured material
that also partly fills nearby impact craters. The origin of the
textured material is unknown but might result from years and years of
wind erosion of surface 'soil' or volcanic ash. However it formed,
this covering obscures so much of the details of the valleys that high
resolution pictures are unlikely to solve this mystery.
The picture above covers an area approximately 8 kilometers (5 miles)
wide by 15 kilometers (9 miles) high. Illumination is from the right.
The picture was acquired in August 1998 during the MGS Science Phasing
Orbits imaging campaign, and was presented at the 30th Lunar and Planetary
Science Conference in Houston, Texas, March 1999.
Malin Space Science Systems and the California Institute of
Technology built the MOC using spare hardware from the Mars Observer
mission. MSSS operates the camera from its facilities in San Diego,
CA. The Jet Propulsion Laboratory's Mars Surveyor Operations Project
operates the Mars Global Surveyor spacecraft with its industrial
partner, Lockheed Martin Astronautics, from facilities in Pasadena, CA
and Denver, CO.
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