<p>The Oxia Planum region of Mars was selected as the landing site of the upcoming ESA ExoMars Rosalind Franklin Rover because of the match with science requirements as well as its relatively flat topography. Previous works mapped isolated boulders in the area but did not find any signs of fresh mass wasting activity. Here, we report on 48 newly discovered rockfall locations inside and around the landing characterization area. The freshness of many rockfalls at these locations is evidenced by the presence of prominent deep tracks. They tend to occur in common geologic settings, including possible small secondary craters and rounded isolated mounds which are widespread in the region. We argue that impact cratering played an important role in preconditioning slopes for rockfalls and distributing loose material, but specific triggers are elusive. Our geospatial measurements of rockfalls in Oxia Planum also enable estimating geotechnical properties (bearing capacity) of surface materials for the first time. We show that the bearing capacity of soil, a quantity relevant to the rover’s ability to traverse the area, is sufficient to support its weight. The presence of rockfalls in Oxia Planum opens up new possibilities for sampling geologic units otherwise inaccessible to the rover.</p>

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Fresh rockfalls near the landing site of ExoMars Rosalind Franklin Rover: drivers, trafficability, and implications

  • Aleksandra J. Sokołowska,
  • Ingrid J. Daubar,
  • Ariyana Bonab,
  • Ian Haut,
  • Valentin T. Bickel,
  • Peter Fawdon,
  • Peter Grindrod,
  • Susan J. Conway

摘要

The Oxia Planum region of Mars was selected as the landing site of the upcoming ESA ExoMars Rosalind Franklin Rover because of the match with science requirements as well as its relatively flat topography. Previous works mapped isolated boulders in the area but did not find any signs of fresh mass wasting activity. Here, we report on 48 newly discovered rockfall locations inside and around the landing characterization area. The freshness of many rockfalls at these locations is evidenced by the presence of prominent deep tracks. They tend to occur in common geologic settings, including possible small secondary craters and rounded isolated mounds which are widespread in the region. We argue that impact cratering played an important role in preconditioning slopes for rockfalls and distributing loose material, but specific triggers are elusive. Our geospatial measurements of rockfalls in Oxia Planum also enable estimating geotechnical properties (bearing capacity) of surface materials for the first time. We show that the bearing capacity of soil, a quantity relevant to the rover’s ability to traverse the area, is sufficient to support its weight. The presence of rockfalls in Oxia Planum opens up new possibilities for sampling geologic units otherwise inaccessible to the rover.