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What Would Happen If an Asteroid Hit the Mariana Trench? Analytics Table
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What would happen if an asteroid hit the Mariana Trench? There is a place in the western Pacific where the ocean floor simply gives up. Almost eleven kilometres straight down, deeper than Mount Everest is tall. The pressure is over a thousand times what you are standing in right now. Only a handful of people have ever been to the bottom. More humans have walked on the Moon. Now imagine something arriving there from the opposite direction. A rock a kilometre wide, moving at twenty kilometres per second, aimed at the deepest point on Earth. Most people assume eleven kilometres of water would absorb it. That assumption is wrong in a very specific and very interesting way. At twenty kilometres per second, water does not behave the way your intuition says it should. The asteroid crosses the entire depth of the Mariana Trench in roughly half a second and hits the seafloor at close to full speed, releasing around sixty thousand megatons. Every nuclear weapon ever built, detonated at once, would not come close. What forms next is one of the strangest things in physics: a hole in the Pacific Ocean. A cylindrical void tens of kilometres across with near-vertical walls of water and bare seafloor exposed at the bottom, open to the sky for the first time in two hundred million years. Then it collapses, and what comes back out is a column of water kilometres tall. We also correct the thing everyone gets wrong about this scenario. The image of a single kilometre-high wave crossing the entire Pacific and swallowing a continent is not what happens, and the reason why involves a real difference between earthquake tsunamis and impact tsunamis that almost nobody explains. And then there is the detail that makes this specific location so dangerous. The Mariana Trench is not just deep water. It is a subduction zone, a seam where one tectonic plate is diving beneath another, already locked and already storing strain. Hitting it is the geological equivalent of striking a loaded spring with a hammer. But the ending is the part nobody expects. Of all the places on Earth for a one kilometre asteroid to hit, the deepest part of the ocean may be one of the least bad, and the reason comes down to what killed the dinosaurs. It was not the size of the Chicxulub impactor. It was the chemistry of the rock it happened to land on. CHAPTERS 00:00 - Introduction: The deepest place on Earth 01:40 - The geology beneath the trench 02:59 - The asteroid enters the atmosphere 04:17 - Striking the ocean and seafloor 06:00 - The transient cavity and ocean collapse 07:43 - Megatsunamis across the Pacific 09:37 - Why impact waves behave differently 11:26 - Atmospheric and climate aftermath 13:17 - Triggering the Ring of Fire 14:50 - Why the trench might save humanity This is a science based thought experiment built on real physics: hypervelocity impact mechanics, transient cavity formation, impact tsunami wave dispersion, stratospheric aerosol loading and subduction zone seismology. If you enjoy space documentaries, Earth science and what if scenarios about our planet, subscribe to The Last Day. New documentary every week on the moments that could end a world. More what if documentaries on this channel: What Would Happen If an Asteroid Hit the Ocean What Would Happen If the Earth Stopped Spinning What Would Happen If the Sun Disappeared for One Week #whatif #asteroid #marianatrench #documentary #science #ocean #space #thelastday
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