Cited by 206Planetary Science and ExplorationAstro and Planetary ScienceSoil Mechanics and Vehicle Dynamics

Size‐frequency distributions of rocks on Mars and Earth analog sites: Implications for future landed missions

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Golombek, M., Rapp, D.·1997·Journal of Geophysical Research: Planets

Abstract

The size‐frequency distribution of rocks at the Viking landing sites and a variety of rocky locations on the Earth that formed from a number of geologic processes all have the general shape of simple exponential curves, which have been combined with remote sensing data and models on rock abundance to predict the frequency of boulders potentially hazardous to future Mars landers and rovers. Rock data from the near field of the Viking landers where dimensions can be measured accurately in stereo images and estimates from the far field of Viking 1 have convex up curved shapes on log‐log graphs of cumulative frequency per square meter or cumulative fractional area versus diameter. The rock data show a sharp drop‐off at large diameters and a progressive approach to a plateau with decreasing diameter (approaching the total rock coverage), which can be fit well with simple exponential functions. Similar shaped size‐frequency distributions of rocks are found at a wide variety of rocky surfaces on the Earth and can be fit well with simple exponential functions. This distribution is compatible with fracture and fragmentation theory, which provides a physical basis for its wide application. A combined fit to rock area data at both Viking sites was made with a general exponential function, in which the pre‐exponential is the total area covered by rocks. Simple linear height versus diameter relationships were also derived from height‐diameter ratios at the Viking sites, which suggest that rockier areas on Mars have higher standing rocks than less rocky areas. Height was then substituted into the general exponential function derived for diameter, yielding the cumulative fractional area of rocks versus height for any given total rock coverage on Mars. Results indicate that most of Mars is rather benign with regard to hazards from landing on large rocks. For total rock coverage of 8%, equivalent to modal rock coverage on Mars and the Viking 1 site without the outcrops, about 1% of the surface is covered by 20 cm or higher rocks. A lander designed to accommodate landing on 0.5‐m‐high boulders, such as the Mars Pathfinder airbag system, could land on a surface covered by about 20% rocks, similar to the Viking 2 site (which is rockier than ∼95% of the planet), with ∼1% of the surface covered by rocks of 0.5 m or higher.

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Crossref · 10.1029/96je03319

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Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • The terrain at Gusev crater is well suited for Visual Odometry processing.

    “The terrain at Gusev crater is well suited for Visual Odometry processing.”

    From Two years of Visual Odometry on the Mars Exploration Rovers (2007) · cites this paper as Golombek & Rapp, 1997

    The passages on Viking landing sites and Earth analog sites describe rock distributions, not terrain at Gusev crater or its suitability for Visual Odometry. Further searches for “Gusev crater” and “visual odometry rover navigation” found no passage addressing the claim. Page numbers were unavailable in our copy. (LLM, conf=0.75)

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  • The rock abundances at Gusev crater matched predicted distributions, resulting in a generally feature-rich landscape with detailed textures comprised of rocks of different sizes and brightnesses.

    “The rock abundances there matched predicted distributions ( Golombek & Rapp, 1997 ) , resulting in a generally feature-rich landscape with detailed textures comprised of rocks of different sizes and brightnesses.”

    From Two years of Visual Odometry on the Mars Exploration Rovers (2007) · cites this paper as Golombek & Rapp, 1997

    The Abstract describes predicted rock-size distributions based on Viking landing sites and Earth analog sites. A search for Gusev in our copy found no passage reporting rock abundances there or comparing them with those predictions, so the cited paper does not verify the claimed match. (LLM, conf=0.78)

    Experimental — accuracy not yet measured

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Research works printed but not linked: 2

  1. 21562202e, 1997, E2, · DOI
  2. 21562202e, 1997, E2, · DOI

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Authors
Golombek, M., & Rapp, D.
Affiliations
California Institute of Technology (US)
Venue
Journal of Geophysical Research: Planets
Published
1997-02
Volume
102
Issue
E2
Pages
4117-4129
ISSN
0148-0227 (ISSN-L)
OpenAlex
W2070682236
Cited by
206
References
29
Citations by year
2026: 8 · 2025: 7 · 2024: 9 · 2023: 8 · 2022: 7 · 2021: 10 · 2020: 12 · 2019: 9 · 2018: 9 · 2017: 6 · 2016: 9 · 2015: 2 · 2014: 5 · 2013: 6 · 2012: 10
FWCI
4.24
Type
journal article
Language
en
Open access
Locations
Journal of Geophysical Research Atmospheres (publishedVersion)
Funders
  • California Institute of Technology
  • Jet Propulsion Laboratory
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Planetary Science and Exploration
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
  • Physical Sciences › Engineering › Civil and Structural Engineering › Soil Mechanics and Vehicle Dynamics
Keywords
size-frequency distribution, rock size, Mars, Mars rover, exponential distribution, height-diameter relationship, Mars Pathfinder, landing site selection

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