Variations in the onset diameter for Martian layered ejecta morphologies and their implications for subsurface volatile reservoirs

Nadine Barlow, John Koroshetz, James M. Dohm

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Abstract

We investigated regional variations in the onset diameter of craters displaying a single layer ejecta morphology within ±30° latitude using Viking imagery. Our results generally agree with those of previous studies which show onset diameters of 5 to 6 km in the equatorial region, but we have identified localized regions with unusually small onset diameters. The largest region is located in Solis and Thaumasia Planae. The 3-5 km onset diameter range in this area indicates a near-surface icerich reservoir (depth ~110 m). This unusual concentration of near-surface ice may have resulted from magnetic-driven uplifts associated with the Tharsis rise, which modified parts of a regional aquifer/drainage basin system and resulted in the transfer and concentration of subsurface volatiles in this region.

Original languageEnglish (US)
Pages (from-to)3095-3098
Number of pages4
JournalGeophysical Research Letters
Volume28
Issue number16
DOIs
StatePublished - Aug 15 2001
Externally publishedYes

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ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

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