Megatsunamis are not only much larger than your average tsunami, they also form under different conditions. Good news: they're extremely rare. Bad news: they might not be for long. Hosted by: Hank Green SciShow has a spinoff podcast! It's called SciShow Tangents. Check it out at http://www.scishowtangents.org ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Kevin Bealer, Jacob, Katie Marie Magnone, D.A.Noe, Charles Southerland, Eric Jensen, Christopher R Boucher, Alex Hackman, Matt Curls, Adam Brainard, Scott Satovsky Jr, Sam Buck, Ron Kakar, Chris Peters, Kevin Carpentier, Patrick D. Ashmore, Piya Shedden, Sam Lutfi, charles george, Greg ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow ---------- Sources: https://www.nature.com/news/huge-landslide-triggered-rare-greenland-mega-tsunami-1.22374 https://www.nationalgeographic.com/environment/natural-disasters/tsunamis/ http://itic.ioc-unesco.org/index.php?option=com_content&view=article&id=1203:what-is-a-mega-tsunami-and-can-it-happen-today&catid=1340&Itemid=2054 https://www.theatlantic.com/science/archive/2015/10/traces-of-an-ancient-mega-tsunami/411970/ https://www.nature.com/news/island-boulders-reveal-ancient-mega-tsunami-1.18485#/b2 https://science.sciencemag.org/content/226/4680/1312 https://eos.org/articles/huge-global-tsunami-followed-dinosaur-killing-asteroid-impact https://www.nationalgeographic.com/news/2013/11/131120-oldest-seawater-chesapeake-bay-crater-science/ https://nsidc.org/cryosphere/arctic-meteorology/arctic-people.html https://www.nationalgeographic.com/news/2005/1/tsunamis-facts-about-killer-waves/ https://www.bbc.com/news/world-asia-30034501 https://ui.adsabs.harvard.edu/abs/2018AGUFMPP53B..07R/abstract Images: https://commons.wikimedia.org/wiki/Category:Nuugaatsiaq#/media/File:Nuugaatsiaq.png https://www.istockphoto.com/vector/liberty-statue-silhouette-gm165031912-524976 https://www.istockphoto.com/vector/broad-and-narrow-colorful-waves-with-isolated-on-grey-background-gm1030547574-276104872 https://commons.wikimedia.org/wiki/File:Clituyarho.webm https://commons.wikimedia.org/wiki/File:Lituya_Bay_overview.jpg https://commons.wikimedia.org/wiki/Category:Fogo_(Cape_Verde)_in_the_2000s#/media/File:Fogo,_Cape_Verde_Islands.jpg https://www.istockphoto.com/photo/vaction-in-kenya-gm180815950-24632663?clarity=false https://www.istockphoto.com/photo/sweetheart-rock-of-lanai-island-in-hawaii-gm947937238-258817858 https://www.istockphoto.com/photo/taking-the-plunge-gm1071512834-286751822 https://www.istockphoto.com/photo/landslide-risk-gm485041194-71703523 https://www.istockphoto.com/photo/swirling-ocean-waves-at-red-lava-coast-of-island-of-lanai-gm1080107176-289493883 https://www.istockphoto.com/photo/primosten-old-town-gm1170305125-323793394?clarity=false https://www.istockphoto.com/photo/waves-the-seas-are-being-parted-gm478841321-36063980?clarity=false