Antipodal Terrain

  • David T. BlewettEmail author
Living reference work entry
DOI: https://doi.org/10.1007/978-1-4614-9213-9_465-1

Definition

Surface modification in regions located antipodal to a very large impact feature (impact basin) (Moore et al. 2004).

Synonyms

Description

Disrupted surface at the antipode (point diametrically opposite) from a large impact basin. At the Caloris antipode (Mercury), the surface is broken up into hills ~5–10 km wide and 100–1,800 m high (Strom 1984). Grooves on rims of old craters are found at the antipodes of large lunar basins.

Formation

Formed by antipodal focusing of impact-generated seismic energy (Schultz and Gault 1975; Hughes et al. 1977) and/or antipodal convergence of ejecta (Moore et al. 1974; Wieczorek and Zuber 2001). P-waves generated by an Imbrium-sized impact could generate vertical displacements on the order of 10 m, and reflected tensile waves would produce subsurface crustal weaknesses (Schultz and Gault 1975). Seismic shaking and subsequent...

Keywords

Surface Modification Regional Variation Geographical Information Vertical Displacement Large Impact 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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References

  1. Blewett DT et al (2014) Vesta’s north pole quadrangle Av-1 (Albana): geologic map and the nature of the south polar basin antipodes. Icarus http://dx.doi.org/10.1016/j.icarus.2014.03.007
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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Applied Physics LaboratoryJohns Hopkins UniversityLaurelUSA