How Earthquakes Trigger Tsunamis – Bang Goes The Theory, Preview – BBC One


Earthquakes are caused by the movement of the huge tectonic plates that continents Sit on what happens is they come together and one in this case the pacific plate is moving below the Japanese or Eurasian plate and Causes that plate end when it sticks there they’ll be able to much friction. It’ll stick crasher builds up until suddenly It’s released [click] Have a look at this now This is [the] tectonic plate that Japan is sat on and here’s the pacific plate coming down underneath it And normally they want to move together [at] about nine centimeters a year But sometimes [get] stuck And when they get stuck the energy of the moving together gets translated to strain energy literally Flex and bend in these huge slabs of Rock our energy builds and builds And flexing and bending more and more When they finally slip that stored energy or that twist and bend in the rock gets released into [sub] [moved] like that As you can see it literally flicks up moving the ocean floor above it which moves the ocean causing a tSUNami So here we’ve got [a] bigger Submarine version of what’s going on this gives a representation of what’s been happening 24 kilometers below the Ocean Surface in a Japan Trench And these things work in what they call a stick slip way most of the time They’re stuck but occasionally they slip and that’s what an earthquake is so we’ve got to hear this this is bent up here full of Pent-up energy waiting to slip and when the slip happens That energy gets released into the ocean causing a series of tsUnami waves moving in both directions you

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