The Wind-Scoured Lava Flows of Pavonis Mons
NASA/JPL/University of Arizona
The Wind-Scoured Lava Flows of Pavonis Mons
ESP_045777_1765  Science Theme: Volcanic Processes
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This image shows a circular impact crater and an oval volcanic caldera on the southern flank of a large volcano on Mars called Pavonis Mons.

The caldera is also the source of numerous finger-like lava flows and at least one sinuous lava channel. Both the caldera and the crater are degraded by aeolian (wind) erosion. The strong prevailing winds have apparently carved deep grooves into the terrain.

When looking at the scene for the first time, the image seems motion blurred. However, upon a closer look, the smaller, young craters are pristine, so the image must be sharp and the “blurriness” is due to the processes acting on the terrain. This suggests that the deflation-produced grooves, along with the crater and the caldera, are old features and deflation is not very active today. Alternatively, perhaps these craters are simply too young to show signs of degradation.

This deeply wind-scoured terrain type is unique to Mars. Wind-carved stream-lined landforms on Earth are called “yardangs,” but they don’t form extensive terrains like this one. The basaltic lavas on the flanks of this volcano have been exposed to wind for such a long time that there are no parallels on Earth. Terrestrial landscapes and terrestrial wind patterns change much more rapidly than on Mars.

Written by: Henrik Hargitai and Ginny Gulick (audio: Tre Gibbs)  (21 September 2016)
 
Acquisition date
02 May 2016

Local Mars time
15:18

Latitude (centered)
-3.393°

Longitude (East)
245.740°

Spacecraft altitude
256.9 km (159.7 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 up

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Equirectangular

Emission angle
7.2°

Phase angle
45.9°

Solar incidence angle
52°, with the Sun about 38° above the horizon

Solar longitude
146.2°, Northern Summer

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North azimuth:  97°
Sub-solar azimuth:  27.2°
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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.