Encyclopedia of Planetary Landforms

2015 Edition
| Editors: Henrik Hargitai, Ákos Kereszturi

Compaction Crater

Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-3134-3_59

Definition

Impact crater formed in highly porous material by compaction and pore-space collapse instead of excavation.

Description

Impact crater formed by pore-space collapse or compaction that results in a little or no ejecta blanket beyond the crater rims. On the other hand, not all craters lacking ejecta blankets are compaction craters. The lack of ejecta may also be due to low gravity and/or difficulty of being recognized (e.g., little color/morphological contrast). A notable example of a regular crater lacking evident ejecta blanketing is represented by the 50-km crater Massilia observed on asteroid Lutetia (Marchi et al. 2011).

Formation

Formed by compression rather than excavation of material (Housen and Holsapple 2003, 2012).

Proposed Mechanisms to Explain Target Material Porosity

The shrinking (e.g., porosity collapse – gravitational self-compaction) and differentiation of a sufficiently large body result in converting potential gravitational energy into heat. Internal warming...

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References

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Southwest Research InstituteBoulderUSA