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Studying the Global Spatial Randomness of Impact Craters on Mercury, Venus, and the Moon With Geodesic Neighborhood Relationships

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DOI

  • C. Riedel, Free University of Berlin
  • ,
  • G. G. Michael, Free University of Berlin
  • ,
  • C. Orgel, Directorate of Human and Robotic Exploration
  • ,
  • C. Baum
  • C. H. van der Bogert, University of Münster
  • ,
  • H. Hiesinger, University of Münster

Impact crater records on planetary surfaces are often analyzed for their spatial randomness. Generalized approaches such as the mean second closest neighbor distance (M2CND) and standard deviation of adjacent area (SDAA) are available via a software tool but do not take the influence of the planetary curvature into account in the current implementation. As a result, the measurements are affected by map distortion effects and can lead to wrong interpretations. This is particularly critical for investigations of global data sets as the level of distortion typically increases with increasing distance from the map projection center. Therefore, we present geodesic solutions to the M2CND and SDAA statistics that can be implemented in future software tools. We apply the improved methods to conduct spatial randomness analyses on global crater data sets on Mercury, Venus, and the Moon and compare the results to known crater population variations and surface evolution scenarios. On Mercury, we find that the emplacement of smooth plain deposits strongly contributed to a global clustering of craters and that a random distribution of Mercury's basins is not rejected. On Venus, the randomness analyses show that craters are largely randomly distributed across all sizes but where local nonrandom distributions due to lower crater densities in regions of recent volcanic activity may appear. On the Moon, the global clustering of craters is more pronounced than on Mercury due to mare volcanism and the Orientale impact event. Furthermore, a random distribution of lunar basins is not rejected.

Original languageEnglish
Article numbere2020JE006693
JournalJournal of Geophysical Research: Planets
Volume126
Issue3
ISSN2169-9097
DOIs
Publication statusPublished - Mar 2021

Bibliographical note

Publisher Copyright:
© 2021. The Authors.

    Research areas

  • cratering, Mercury, Moon, planetary data, spatial statistics, Venus

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