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Volcanic collapse created 800ft tidal wave

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Starlena
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« on: October 10, 2015, 06:51:39 pm »

Volcanic collapse created 800ft tidal wave
Posted on Sunday, 4 October, 2015




The volcano could be on the verge of another collapse. Image Credit: CC BY-SA 3.0 Pascal Givry
A volcanic disaster that created an enormous tidal wave could potentially occur again in the near future.
73,000 years ago a large volcano on the Cape Verdean island of Fogo suddenly collapsed, producing a huge wave several hundred meters high that decimated nearby islands.

Since then however the volcano has been gradually growing back to its original size and now scientists are concerned that something similar could be on the verge of happening again.

The enormous wave was produced by what is known as a 'flank collapse' which occurs when the volcano's slopes collapse in to the ocean like a gigantic landslide.

"Our point is that flank collapses can happen extremely fast and catastrophically, and therefore are capable of triggering giant tsunamis," said scientist Dr Ricardo Ramalho.

"They probably donít happen very often. But we need to take this into account when we think about the hazard potential of these kinds of volcanic features."

Right now the volcano on Fogo has risen to 2,743 metres above sea level - enough to create a similar disaster if another flank collapse were to occur again in the present day.

The last time this happened the resulting tidal wave was more than six times the height of the devastating tsunamis that hit India's coast in 2004 and eastern Japan back in 2011.

Tsunami expert Prof Bill McGuire believes that this event occurs once every 10,000 years.

"The scale of such events, as the Fogo study testifies, and their potentially devastating impact, makes them a clear and serious hazard in ocean basins that host active volcanoes," he said.

   
http://www.theguardian.com/world/2015/oct/02/volcano-collapse-caused-mega-tsunami-cape-verde-fogo-scientists-study
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Starlena
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« Reply #1 on: October 10, 2015, 06:52:50 pm »

Volcano's collapse caused mega-tsunami 240 metres high – study

Scientists warn that similar event to collapse of volcano on Cape Verdean island of Fogo 73,000 years ago poses major threat to nearby islands



Fogo on Cape Verde is one of the world’s most active island volcanoes. Photograph: Alamy
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Starlena
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« Reply #2 on: October 10, 2015, 06:53:10 pm »



Press Association

Friday 2 October 2015 16.14 EDT
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The sudden collapse of a volcano caused a tsunami that created waves up to 240 metres (800ft) high 73,000 years ago, scientists have discovered.

The mega-tsunami took place near the Cape Verde islands off west Africa when the slopes of the volcano gave way – a process known as a “flank collapse” – and some experts fear a similar collapse could present a real threat today, especially around volcanic islands.

The lead scientist, Dr Ricardo Ramalho, now at Bristol University, and his team at Columbia University in New York, said: “Our point is that flank collapses can happen extremely fast and catastrophically, and therefore are capable of triggering giant tsunamis. They probably don’t happen very often. But we need to take this into account when we think about the hazard potential of these kinds of volcanic features.”
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Starlena
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« Reply #3 on: October 10, 2015, 06:53:47 pm »



The ancient collapse occurred at the Cape Verdean island of Fogo, one of the world’s largest and most active island volcanoes, which towers 2,743 metres above sea level.

An estimated 167 cubic km (40 cubic miles) of rock fell into the ocean, resulting in a wave that engulfed an island more than 30 miles away.

By comparison, the largest known recent tsunamis, which devastated Indian Ocean coasts in 2004 and eastern Japan in 2011, attained maximum heights of about 30 metres. These tsunamis were triggered by undersea earthquakes rather than volcanic collapses.

Clues left by the mega-tsunami include boulders the size of lorries that had been carried up to 600 metres inland and nearly 200 metres above sea level on Santiago island, 34 miles from Fogo.
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Starlena
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« Reply #4 on: October 10, 2015, 06:54:22 pm »



A huge boulder found on Santiago island carried more than 30 miles by the tsunami. Photograph: Ricardo Ramalho/Columbia University/PA
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Starlena
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« Reply #5 on: October 10, 2015, 06:55:21 pm »

The boulders, weighing up to 770 tonnes, matched marine-type rocks ringing the island’s shores and were quite unlike the volcanic terrain on which they were found.

By calculating the energy needed to hurl the boulders such a distance, the scientists were able to estimate the size of the wave. Their findings are reported in the journal Science Advances. Prof Bill McGuire, a tsunami expert from University College London, believes such mega-tsunami events occur once every 10,000 years.

He said: “Nevertheless, the scale of such events, as the Fogo study testifies, and their potentially devastating impact, makes them a clear and serious hazard in ocean basins that host active volcanoes.”
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Starlena
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« Reply #6 on: October 10, 2015, 06:55:40 pm »

http://www.theguardian.com/world/2015/oct/02/volcano-collapse-caused-mega-tsunami-cape-verde-fogo-scientists-study
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Misanthropic
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« Reply #7 on: October 10, 2015, 07:00:43 pm »

Conclusion? Well eventually planet Earth will get to cope with this again, and since the mayority of mankind lives in coastal regions instead of the much rougher mountanous or desertlike regions i am afraid that it Will pass over us like the lava over Pompej, but hey at least it willl be over in a second!
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Helmut
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« Reply #8 on: October 10, 2015, 08:12:13 pm »

I believe I read Cape Verde is on the verge of a collapsed again.
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DieChecker
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« Reply #9 on: October 10, 2015, 10:30:41 pm »

I see articles of people saying.... PREPARE!! But what the Hell. What can someone, say.... in Los Angles, really do? There's no where for them to go really, maybe up a tall building, but if you have like 10 minutes warning, really all you can do is log onto facebook and post a farewell, and text some loved ones before the wave gets you.
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Blackwater
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« Reply #10 on: October 10, 2015, 10:53:23 pm »

170 Meters seems high, what are we talking here, from Sea Bed?
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The Creeper
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« Reply #11 on: October 11, 2015, 01:34:17 am »

They say at shoreline, so sea level. (Which is also the sea bed at that point but I don't think that was the point.) And a potential wave run-up of 100 m further, to 270 m.
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Xomon
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« Reply #12 on: October 11, 2015, 01:36:04 am »

That's a big Tsunami indeed !,But Its possible,Just Like the Thousand year record flood in S.C. USA. I didn't know that we had Record keeping 1,000 years ago ? well it is S.C afterall .Big tales and Big-Foots and such !
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Zalmoxis
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« Reply #13 on: October 11, 2015, 01:38:25 am »

We've now had two thousand year floods in two years (Colorado 2013).
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DieChecker
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« Reply #14 on: October 11, 2015, 01:39:58 am »

Did the President come visit after Katrina... errr... I mean Joaquin....
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