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Triple-terraced crater on Mars

Triple-terraced crater on Mars

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NASA / JPL / UA / Emily Lakdawalla

Triple-terraced crater on Mars
Terraced craters hint at subsurface layers in the Martian ground. This crater is in Arcadia Planitia.

The original image has been processed to emphasize the fine structure of polygons. The color image was overlaid on a contrast-stretched grayscale image.

Here is a detail view:

Triple-terraced crater on Mars (detail)

NASA / JPL / UA / Emily Lakdawalla

Triple-terraced crater on Mars (detail)

Caption by Shane Byrne from the HiRISE website: Small impact craters usually have simple bowl shapes; however, when the target material has different layers of different strength, then more complicated crater shapes can emerge. The most common situation is a weaker layer overlying a stronger one. In that case, these craters usually have a terrace on their inner walls where the crater abruptly becomes smaller at the depth where this change in material occurs. In this image of Arcadia Planitia, we can see one of these terraced craters. In fact, there are two distinct terraces implying at least three distinct layers in this target. Images like this help scientists probe the near subsurface of Mars. In this case, the different material strengths are probably caused by layers of ice (weak) and rock (strong).

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. For uses not allowed by that license, contact us to request publication permission from the copyright holder: Emily Lakdawalla

Original image data dated on or about August 11, 2013

Explore related images: BMSIL, pretty pictures, data art (was amateur image processing), Mars, impact cratering, Mars Reconnaissance Orbiter

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