Multi-ringed basin

A multi-ringed basin (also a multi-ring impact basin) is not a simple bowl-shaped crater, or a peak ring crater, but one containing multiple concentric topographic rings;^[1] a multi-ringed basin could be described as a massive impact crater, surrounded by circular chains of mountains^[2] resembling rings on a bull's-eye. A multi-ringed basin may have an area of many thousands of square kilometres.^[3]

Valhalla Basin on Jupiter's moon Callisto, taken by Voyager 1

An impact crater of diameter bigger than about 180 miles (290 km) is referred to as a basin.^[4]

Structure

In adjacent rings, the ratio of the diameters approximates √2:1 ≈ 1.41 to 1.^[5][6][7]

Formation

Mare Orientale, on Earth's Moon

To start, a peak ring crater has

• one peak-ring, i.e., a crater rim, which is generally circular, and
• a mountainous region which surrounds the basin center.

A multi-ringed basin has an important difference, which is multiple peak-rings.

In extremely large collisions, following the impact the rebound of the surface can obliterate any trace of the initial impact point. Usually, a peak ring crater has a high structure with a terrace and has slump structures inside of it. In 2016, research brought forward new theories about the formation of the lunar mare called Mare Orientale on Earth's Moon.^[8]

Multi-ring basins are some of the largest, oldest, rarest and least understood of impact craters. There are various theories to explain the formation of multi-ringed basins, however there is currently no consensus.^[9][10]

Examples

• Mare Orientale on Earth's Moon is a multi-ringed basin created by an impactor perhaps 60 kilometres (40 mi) in diameter traveling at 14 kilometres per second (9 mi/s), or about 52,100 kilometres per hour (32,400 mph)^[11]
• Anubis on Ganymede, the largest moon of Jupiter
• Valhalla on Callisto, a moon of Jupiter
• Evander on Dione, a moon of Saturn
• Caloris Basin, surrounded by Caloris Montes, on Mercury
• Burney on Pluto, a dwarf planet in the Kuiper belt

Chicxulub crater in Mexico has a sufficient area to have been a multi-ringed basin,^[12]

See also

• Central-peak crater – Large impact craters with uplifted centresPages displaying short descriptions of redirect targets
• Complex crater – Large impact craters with uplifted centres
• Impact crater – Circular depression in a solid astronomical body formed by the impact of a smaller object
• Impact event – Collision of two astronomical objects
• Impact structure – Geologic structure formed from impact on a planetary surface
• Peak ring (crater) – Roughly circular ring or plateau, possibly discontinuous, surrounding an impact crater's centerPages displaying short descriptions of redirect targets
• Pedestal crater – type of impact craterPages displaying wikidata descriptions as a fallback
• Expanded crater – Type of secondary impact craterPages displaying wikidata descriptions as a fallback
• Traces of Catastrophe – Comprehensive technical reference on the science of impact craters book from Lunar and Planetary Institute - comprehensive reference on impact crater science

References

1. Head, J. W. (January 2010). "Transition from complex craters to multi-ringed basins on terrestrial planetary bodies: Scale-dependent role of the expanding melt cavity and progressive interaction with the displaced zone". Geophysical Research Letters. 37 (2). Bibcode:2010GeoRL..37.2203H. doi:10.1029/2009GL041790.
2. "Lunar Landforms Teacher Page". Hawai'i Space Grant Consortium, Hawai'i Institute of Geophysics and Planetology, University of Hawai'i. 1998. Archived from the original on 12 February 2018. Retrieved 18 January 2019.
3. "Multiringed basin". Encyclopedia Britannica. February 1, 2018. Retrieved January 20, 2019.
4. "How Multi-Ring Craters Form Revealed by New Research". Ideas, Inventions And Innovations. October 29, 2016. Archived from the original on 1 July 2017.{{cite web}}: CS1 maint: unfit URL (link)^{[self-published source?]}
5. "Multi-Ring Basin". Encyclopedia.com. Retrieved January 20, 2019.
6. Moons & Planets, William K. Hartmann, 2005, p.255ff
7. Martellato, Elena (January 31, 2011). The importance of being a crater: A tool in planetary surface analysis and datation (PDF) (PhD Thesis). Università degli Studi di Padova. Retrieved January 20, 2019.
8. Stacey, Kevin (October 27, 2016). "Research helps explain formation of ringed crater on the Moon". News from Brown. Retrieved 20 January 2019.
9. Potter, Ross W.K. (November 2015). "Investigating the onset of multi-ring impact basin formation". Icarus. 261: 91–99. Bibcode:2015Icar..261...91P. doi:10.1016/j.icarus.2015.08.009.
10. Stuart Ross Taylor (1982). "Meteorite impacts, craters and multi-ring basins" (PDF). Planetary Science: A Lunar Perspective. Lunar and Planetary Institute. Retrieved 19 January 2019.
11. Chu, Jennifer (October 27, 2016). "Retracing the origins of a massive, multi-ring crater". MIT News. Retrieved 20 January 2019.
12. McKinnon, W. B.; Alexopoulos, J. S. (January 1994). "Some implications of large impact craters and basins on Venus for terrestrial ringed craters and planetary evolution". KT Event and Other Catastrophes. hdl:2060/19940023803.