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.
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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
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
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