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Ze noemen het “The really big one” en sinds half juli is het groot nieuws in de Verenigde Staten. Het begon met een goed artikel in The New Yorker over de Cascadia breuklijn of Cascadia subduction zone, die loopt langs de westkust van Noord Amerika, van San Francisco tot Vancouver. De tektonische plaat van de Stille Oceaan kruipt daar onder die van Noord Amerika. Dat leidt tot een geologische spanning die kan leiden tot een aardbeving van 8.7 tot 9.2 op de schaal van Richter, een kwartier later gevolgd door een 30 meter hoge tsunami.

Het nieuws werd overgenomen door Fox News en CBS, waarna allerlei alternatieve Christenen weer eens waarschuwden voor de “eindtijd”, de Apocalyps die volgens hen wordt voorspeld in de Bijbel en dus zeker zal komen. Het is inderdaad vrij zeker dat de Cascadia breuklijn op den duur een aardbeving plus tsunami kan veroorzaken, maar de vraag is: wanneer? Het hele continent van Noord Amerika is geologisch minder stabiel.

Op BOUblog staan reeds artikelen over De San Andreasbreuklijn (juli 2014), De Yellowstone super-vulkaan (idem) en De New Madrid Missouri breuklijn (november 2014). Allemaal kunnen ze “elk moment” leiden tot een mega natuurramp, maar hoewel er voortdurend kleine aardschokken worden geregistreerd in deze gebieden, blijkt “The Really Big One” tot op heden slechts een komkommer!

Cascadia Rising: Scientists warn of devastating earthquake ripping apart Pacific Northwest

Gepubliceerd op 16 jul. 2015

Seismologists and federal officials are predicting a devastating earthquake in the Pacific Northwest along the Cascadia Fault line that could, theoretically, leave tens of thousands of people dead and even more displaced. RT’s Simone Del Rosario speaks with seismologist John Vidale about the possibility of a disaster striking.

Is a massive earthquake in Pacific Northwest “overdue”?

Gepubliceerd op 16 jul. 2015

Experts think it will trigger the worst natural disaster in North American history. Roughly 80 miles off the coast of Oregon, there’s a place deep down inside the Earth that few people living along the West Coast know about. But they will someday, years or even decades from now.

That’s because this is a place called the Cascadia subduction zone, where a pair of tectonic plates are now grinding up against one another under the Pacific Ocean, and they’re headed — slowly but inevitably — toward a moment when the pressure now building there will become too great to bear.

When that happens, a huge swath of the Pacific Northwest will be engulfed in the worst natural disaster in the history of North America, writes journalist Kathryn Schulz in a terrifying new article published this week in the New Yorker, titled “The Really Big One.”

Het is allemaal best angstaanjagend, maar het blijkt al vele jaren bekend. Na de verwoestende tsunami op 2e Kerstdag 2004 in de Indische Oceaan, maakte de BBC een documentaire over de Cascadia breuklijn. Voor wie geïnteresseerd is in geologie biedt deze docu inzicht in de manier waarop men de komende grote aardbeving kan voorspellen, namelijk NIET !!!

MegaQuake Could Hit North America – BBC (Full Documentary) duurt 48 minuten.

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3 Reacties op “De Cascadia breuklijn”

  • Boudine:

    Het laatste nieuws is dat de geleerden een grote aardbeving voorspellen in de Hayward Faultline. Die loopt parallel met de St. Andreas Faultline, maar dan een beetje landinwaarts, bij San Francisco.

    De geleerden zeiden dat echter ook reeds in 2008! Spannend blijft het wel. 😉

    The REAL Big One: Scientists predict major West Coast earthquake soon

  • mr.drs.Bou:

    De spanning stijgt weer.
    The Big One: Fear of catastrophic quake grows in California as dormant fault line moves for 1st time in 500yrs

    Caltech researchers say there is an elevated risk that a long-overdue earthquake, dubbed the ‘Big One,’ is on the way, after recent seismic activity shifted a previously-dormant fault line for the first time in 500 years.

    California was rocked by several major earthquakes in July and August. The Ridgecrest earthquake in Southern California was the strongest in 20 years and caused roughly 100,000 aftershocks.

    All of the pressure from these tremors and aftershocks was so extreme that it apparently woke a sleeping giant in the form of the 185-mile-long Garlock Fault, causing it to ‘creep’ almost an inch (a big deal in geological terms if nothing else).

    “This is surprising because we’ve never seen the Garlock Fault do anything. Here, all of a sudden, it changed behaviour,” said Zachary Ross, assistant professor of geophysics at Caltech and an author of a study on the fault.

    There are now fears that if Garlock keeps creeping it may disturb the San Andreas fault and trigger the long-feared ‘Big One’ which could devastate the entire state and swallow cities like San Francisco and Los Angeles whole. The southern San Andreas Fault experiences major quakes roughly every 150 years, the last of which took place in 1857, meaning the fear of a potentially cataclysmic future megaquake grows every year.

  • mr.drs.Bou:

    The Really Big One: The Next Rupture of The Cascadia Subduction Zone Will Produce One of The Worst Natural Disasters in the History of North America
    Kathryn Schulz
    The New Yorker
    Mon, 13 Jul 2015 00:00 UTC

    Most people in the United States know just one fault line by name: the San Andreas, which runs nearly the length of California and is perpetually rumored to be on the verge of unleashing “the big one.” That rumor is misleading, no matter what the San Andreas ever does. Every fault line has an upper limit to its potency, determined by its length and width, and by how far it can slip. For the San Andreas, one of the most extensively studied and best understood fault lines in the world, that upper limit is roughly an 8.2 — a powerful earthquake, but, because the Richter scale is logarithmic, only six per cent as strong as the 2011 event in Japan.

    Just north of the San Andreas, however, lies another fault line. Known as the Cascadia subduction zone, it runs for seven hundred miles off the coast of the Pacific Northwest, beginning near Cape Mendocino, California, continuing along Oregon and Washington, and terminating around Vancouver Island, Canada. The “Cascadia” part of its name comes from the Cascade Range, a chain of volcanic mountains that follow the same course a hundred or so miles inland. The “subduction zone” part refers to a region of the planet where one tectonic plate is sliding underneath (subducting) another. Tectonic plates are those slabs of mantle and crust that, in their epochs-long drift, rearrange the earth’s continents and oceans. Most of the time, their movement is slow, harmless, and all but undetectable. Occasionally, at the borders where they meet, it is not.

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