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A 20-km-diameter multi-ringed impact structure in the North Sea


Most craters found on Earth are highly eroded, poorly preserved and only exposed on land1,2. Here we describe a multi-ringed impact structure discovered in the North Sea from the analysis of three-dimensional seismic reflection data. The structure is 20 km in diameter, and has at least ten distinctive concentric rings located between 2 and 10 km from the crater centre. The structure affects Cretaceous chalk and Jurassic shales, and is well preserved below several hundred metres of post-impact Tertiary strata, which constrains its age to be 60–65 Myr old. The formation of concentric ringed impact structures at this relatively small scale had not previously been thought possible, especially on the terrestrial planets1,3,4. We have mapped the ring structures at a resolution of tens of metres both laterally and in depth, and show that the rings are fault-bounded graben structures, similar to fault arrays formed in low-strain-rate detachment tectonic settings5. Strata deeper than 500 m palaeodepth appear unfaulted, and we infer that the concentric ring structures may have accommodated post-impact extension towards the excavated crater, through detachment on weak layers within the chalk6,7.

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Figure 1: Silverpit crater compared with a similar concentric ringed structure on Europa.
Figure 2: Seismic examples from the Silverpit structure, showing the structural form and geometry of the older and younger strata.
Figure 3: Perspective view, showing the form of the mapped structure in three dimensions.
Figure 4: Detailed view of the seismic structure and interpretation, illustrating the three-dimensional form of the concentric ring structures.


  1. Grieve, R. A. F. & Pesonen, L. J. The terrestrial impact cratering record. Tectonophysics 216, 1–30 (1992)

    ADS  Article  Google Scholar 

  2. Grieve, R. A. F. Extraterrestrial impacts on earth: the evidence and the consequences. Geol. Soc. Lond. Spec. Publ. 140, 105–131 (1998)

    ADS  CAS  Article  Google Scholar 

  3. Melosh, H. J. Impact Cratering: A Geological Process (Oxford Univ. Press, New York, 1989)

    Google Scholar 

  4. Moore, J. M. et al. Large impact features on Europa: Results of the Galileo nominal mission. Icarus 135, 127–145 (1998)

    ADS  Article  Google Scholar 

  5. Schultz-Ela, D. D. & Walsh, P. Modeling of grabens extending above evaporites in Canyonlands National Park, Utah. J. Struct. Geol. 24, 247–275 (2002)

    ADS  Article  Google Scholar 

  6. Melosh, H. J. & McKinnon, W. B. The mechanics of ringed basin formation. Geophys. Res. Lett. 5, 985–988 (1978)

    ADS  Article  Google Scholar 

  7. Allemand, P. & Thomas, P. Small-scale models of multiring basins. J. Geophys. Res. E 104, 16501–16514 (1999)

    ADS  Article  Google Scholar 

  8. Cameron, T. D. J. et al. United Kingdom Offshore Regional Report: The Geology of the Southern North Sea (HMSO, London, 1992)

    Google Scholar 

  9. French, B. M. 25 years of the impact-volcanic controversy: Is there anything new under the sun or inside the Earth? Eos 71, 411–414 (1990)

    ADS  Article  Google Scholar 

  10. Spudis, P. D., Reisse, R. A. & Gillis, J. J. Ancient multiring basins on the moon revealed by Clementine laser altimetry. Science 266, 1848–1851 (1994)

    ADS  CAS  Article  Google Scholar 

  11. Greeley, R., Kiemaszewski, J. E. & Wagner, R. Galileo views of the geology of Callisto. Planet. Space Sci. 48, 829–853 (2000)

    ADS  Article  Google Scholar 

  12. O'Keefe, J. D., Stewart, S. T., Lainhart, M. E. & Ahrens, T. J. Damage and rock-volatile mixture effects on impact crater formation. Int. J. Impact Eng. 26, 543–553 (2001)

    Article  Google Scholar 

  13. Tsikalas, F., Gudlaugsson, S. T. & Faleide, J. I. Collapse, infilling, and postimpact deformation at the Mjølnir impact structure, Barents Sea. Geol. Soc. Am. Bull. 110, 537–552 (1998)

    ADS  Article  Google Scholar 

  14. Wray, D. S. & Wood, C. J. Distinction between detrital and volcanogenic clay-rich beds in Turonian-Coniacian chalks of eastern England. Proc. Yorks. Geol. Soc. 52, 95–105 (1998)

    Article  Google Scholar 

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Correspondence to Simon A. Stewart.

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Stewart, S., Allen, P. A 20-km-diameter multi-ringed impact structure in the North Sea. Nature 418, 520–523 (2002).

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