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Sinuosity of Martian rampart ejecta deposits

Barlow, Nadine G. (1994) Sinuosity of Martian rampart ejecta deposits. Journal of Geophysical Research, 99 (E5). pp. 10927-10935. ISSN 0148-0227


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Publisher’s or external URL: http://dx.doi.org/10.1029/94JE00636


The sinuosities of 2213 Martian rampart ejecta craters are quantified through measurement of the ejecta flow front perimeter and ejecta area. This quantity, called lobateness, was computed for each complete lobe of the 1582 single lobe (SL), 251 double lobe (DL), and 380 multiple lobe (ML) craters included in this study. A lobateness value of 1 indicates a circular ejecta blanket, whereas more sinuous ejecta perimeters have lobateness values >1. Although resolution does have an effect on the absolute values of lobateness, the general relationships between lobateness and morphology exist regardless of resolution. Evaluation of the lobateness values reveals that the outer lobes of DL and ML craters have higher median lobateness values (i.e., are more sinuous) than the inner lobes. The outermost lobe of ML craters displays higher lobateness values than the outer lobe of DL craters or the single lobe of SL craters. Previous reports of lobateness-diameter, lobateness-latitude, and lobateness-terrain relationships for rampart craters are not supported by this study. Many of the differences between the results of this study and the previous lobateness analyses can be attributed to the inclusion of resolution effects and the distinction between different ejecta morphologies in this study. The results of this study taken together with a previous analysis of the distribution and diameter dependence of different ejecta morphologies are most consistent with the theory that Martian lobate ejecta morphologies form from impact into subsurface volatiles.

Item Type: Article
Publisher’s Statement: Copyright 1994 by the American Geophysical Union
ID number or DOI: 10.1029/94JE00636
Keywords: Martian ejecta deposits, Sinuosity, ejecta morphologies, lobateness values
Subjects: Q Science > QB Astronomy
NAU Depositing Author Academic Status: Faculty/Staff
Department/Unit: College of Engineering, Forestry, and Natural Science > Physics and Astronomy
Date Deposited: 17 May 2017 17:40
URI: http://openknowledge.nau.edu/id/eprint/2598

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