The current martian cratering rate

I. J. Daubar, Alfred S. McEwen, Shane Byrne, M. R. Kennedy, B. Ivanov

Research output: Contribution to journalArticle

91 Citations (Scopus)

Abstract

The discovery of 248 dated impact sites known to have formed within the last few decades allows us to refine the current cratering rate and slope of the production function at Mars. We use a subset of 44 of these new craters that were imaged before and after impact by Mars Reconnaissance Orbiter's Context Camera - a thoroughly searched data set that minimizes biases from variable image resolutions. We find the current impact rate is 1.65×10-6 craters with an effective diameter ≥3.9m/km2/yr, with a differential slope (power-law exponent) of -2.45±0.36. This results in model ages that are factors of three to five below the Hartmann (Hartmann, W.K. [2005]. Icarus 174, 294-320) and Neukum et al. (Neukum, G., Ivanov, B.A., Hartmann, W.K. [2001]. Space Sci. Rev. 96, 55-86)/Ivanov (Ivanov, B.A. [2001]. Space Sci. Rev. 96, 87-104) model production functions where they overlap in diameter. The best-fit production function we measure has a shallower slope than model functions at these sizes, but model function slopes are within the statistical errors. More than half of the impacts in this size range form clusters, which is another reason to use caution when estimating surface ages using craters smaller than ~50m in diameter.

Original languageEnglish (US)
Pages (from-to)506-516
Number of pages11
JournalIcarus
Volume225
Issue number1
DOIs
StatePublished - Jul 2013

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cratering
crater
craters
slopes
Mars
Mars Reconnaissance Orbiter
image resolution
range size
power law
mars
set theory
estimating
cameras
rate
exponents

Keywords

  • Cratering
  • Mars
  • Mars, Surface

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

The current martian cratering rate. / Daubar, I. J.; McEwen, Alfred S.; Byrne, Shane; Kennedy, M. R.; Ivanov, B.

In: Icarus, Vol. 225, No. 1, 07.2013, p. 506-516.

Research output: Contribution to journalArticle

Daubar, IJ, McEwen, AS, Byrne, S, Kennedy, MR & Ivanov, B 2013, 'The current martian cratering rate', Icarus, vol. 225, no. 1, pp. 506-516. https://doi.org/10.1016/j.icarus.2013.04.009
Daubar, I. J. ; McEwen, Alfred S. ; Byrne, Shane ; Kennedy, M. R. ; Ivanov, B. / The current martian cratering rate. In: Icarus. 2013 ; Vol. 225, No. 1. pp. 506-516.
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