Encyclopedia of Planetary Landforms

2015 Edition
| Editors: Henrik Hargitai, Ákos Kereszturi


  • Gerald A. GalganaEmail author
  • Veli-Petri Kostama
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-3134-3_69


Corona circumscribing or superimposed with radiating fracture (dike or graben) system (nova), commonly found on Venus. A subtype of  corona or a type of volcanic center.


Tectono-magmatic centers with prominent joint structures featuring a corona feature circumscribing or superimposed with a radiating fracture or graben system (nova) (Aittola and Kostama 2002; Krassilnikov and Head 2003) (Fig. 1). They may display an arch-like system of graben formed after and probably independently of corona annulus fractures (Kostama and Aittola 2004). They typically exhibit gently sloped central summits and/or elevated topographic centers surrounded by annular ridges (Stofan et al. 1991). Topography of central summit may vary from elevated, plateau-like, flat, or depressed (Stofan et al. 1991). Annular ridge elevation may be circumscribing or partial; with pronounced or gentle slope with respect to surrounding terrain. Sheet and lobate lava flows are sometimes associated with...
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© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Lunar and Planetary Institute, USRAHoustonUSA
  2. 2.Department of Physics/AstronomyUniversity of OuluOuluFinland