Surface modification in regions located antipodal to a very large impact feature (impact basin) (Moore et al. 2004).
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.
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...
KeywordsSurface Modification Regional Variation Geographical Information Vertical Displacement Large Impact
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