Encyclopedia of Planetary Landforms

2015 Edition
| Editors: Henrik Hargitai, Ákos Kereszturi

Radial Ejecta

  • Henrik Hargitai
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-3134-3_294

Definition

Impact crater ejecta emplaced along ballistic trajectories; showing a radial texture and pattern; and consisting of an inner, continuous, thick, hummocky unit and an outer, discontinuous portion dominated by secondary craters (Melosh 1989).

Category

A type of  ejecta

Synonyms

As applied to basin ejecta material: circumbasin materials;  Ballistic ejecta;  Blocky ejecta blanket;  Dry ejecta; Glacis with spurs (Elger 1895, obsolete);  Lunar radial ejecta; Lunar-like morphology; Radial single-layer ejecta (Barlow et al. 2000)

Description

Ejecta that displays a combination of ridges of ejected material, crater chains and rays, all radial to the crater (Figs. 1 and 2). Secondary crater chains can extend to 100s of crater radii from the crater rim (McEwen et al. 2005). The ejecta blanket forms a gentle slope from the raised rim crest to the level of the surrounding terrain (Melosh 1989). No distal ridge (rampart) or lobate (layered) structure is present in radial ejecta.
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References

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.NASA Ames Research Center/NPPMoffett FieldUSA