Prepare Your Self, The Big One Is NOTHING Compared With The REALLY Big One!
754There's Something Even Scarier Than The Big One On The Way!
If there’s something we know about earthquakes, it’s that they cannot be predicted. But this is not a valid reason to just give up. Thanks to the progress made by geology in recent decades, we can now explain why they happen — and we are also able to identify regions where one could occur.
Countries like Chile and Japan are sadly famous — or infamous — because of past earthquake events that caused devastation to their lands. And California is crossed by the San Andreas Fault. No, we’re not talking about GTA. We’re actually referring to a fault that could produce an immense earthquake — the Big One, as they call it.
But what if I told you the Big One is nothing compared to what could soon be unleashed a bit north, where the Cascade Range is located? Forget the Big One. It'll be a Big One — upsized. Something the locals have already dubbed, with shameless pride, the Really Big One: the Cascadia Subduction Zone.
First of all, how are earthquakes produced?
Scientists know that the Earth's crust is made up of a composite of tectonic plates — large portions of crust (and to a small extent, the upper mantle) that continuously move alongside each other like pieces of a giant puzzle. In addition to the 20 main plates, there are also microplates, which are smaller in size.
The regions where tectonic plates come into contact are called subduction zones — where the smaller or less energetic plate dives beneath the larger one. When they collide, that’s when we get trouble.
This hidden threat is where tectonic plates like Juan de Fuca and Gorda are colliding with the North American Plate, sliding beneath it — a recipe for a major quake shake-down.
Cascadia, whose Spanish name refers to the volcanic mountain range of the Cascades, extends inland and parallel to the coast for a length similar to that of the fault. And this entire region is now believed to be capable of producing earthquakes of magnitudes 8 or 9 — as devastating, or even more so, than those unleashed off Indonesia in 2004 and Japan in 2011.
These plates, like slow dancers, are steadily moving toward each other, locked in a collision course. They're currently in a tense standoff, building up energy. One day, that energy will explode — unleashing what might go down in history as the greatest natural disaster in the history of North America.
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Credits: Ron Miller, Mark A. Garlick / MarkGarlick.com ,Elon Musk/SpaceX/ Flickr
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00:00 Intro
00:53 The Cascadia Subduction Zone: How earthquakes are produced
02:40 Backstory
03:24 A seismic history to unfold
07:49 Can't hold it anymore
09:33 Risk Assessment
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