The 100 Kilometer Wide Impact Crater in Canada; Manicouagan Crater
The single largest still completely visible impact crater on the planet is located northeast of Quebec City. There, a 100 kilometer or 62-mile-wide impact crater known as the Manicouagan Crater is situated within a remote section of forest. This feature easily distinguishable due to its ring lake visible from satellite formed when a massive asteroid slammed into the planet more than 200 million years ago. And, the formation of this crater was recently linked to a mass extinction event.
Thumbnail Photo Credit: Google Earth, Image Landsat / Copernicus. This image was overlaid with text, and then overlaid with GeologyHub made graphics (the image border, the orange dotted buried impact crater outline, and the GeologyHub logo).
Estimates on asteroid diameter, velocity, tnt energy equivalent, initial crater depth, and effects from the impact (including earthquake magnitude generated and wind speeds generated) in this video were sourced using the calculator at https://impact.ese.ic.ac.uk/ImpactEar..., which was used with permission.
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Sources/Citations:
[1] Onoue, T., Sato, H., Yamashita, D. et al. Bolide impact triggered the Late Triassic extinction event in equatorial Panthalassa. Sci Rep 6, 29609 (2016). https://doi.org/10.1038/srep29609. CC BY 4.0.
[2] Glen Fergus, 2015, Article link: http://gergs.net/all_palaeotemps/, Photo link: https://i0.wp.com/gergs.net/wp-conten..., CC BY 4.0
[3] G. Collins & others, "A numerical assessment of simple airblast models of impact...", Meteoritics & Planetary Science, https://doi.org/10.1111/maps.12873 (2017), CC BY 4.0
0:00 Manicouagan Crater
1:11 Late Triassic Period
2:13 Asteroid Details
2:59 Impact Effects
4:41 Mass Extinction