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Originally posted by EvanB
The main threat in my view is the potential for explosiveness if the sea water that surrounds the volcano makes it to the magma chamber... The temp differential of the water meeting the magma would blow the whole island apart... The resulting tsunami would be devastating...
Originally posted by Foxe
Calm down.
El Hiro is not the Mega-Tsunami island.
La Palma is the island that is a mega tsunami 'threat' and it is not close enough to El Hiro to be affected directly or indirectly. Ontop of which it would take a drastic eruption to move La Palma.
The volcanic island of La Palma in the Canaries is much more stable than is generally assumed, Dutch scientists working at the TU Delft have found. The southwestern flank of the island isn’t likely to fall into the sea (potentially causing a tsunami) for at least another 10,000 years, professor Jan Nieuwenhuis states in the September edition of the university’s science magazine Delft Integraal.
The TU Delft research findings should be a relief for people living at or near the Atlantic coasts of the US, Africa and Europe. Six years ago, geologists proposed that La Palma is so unstable that it might lose one of its flanks during a volcanic eruption in the near future. This would cause a ‘mega tsunami’ with massive waves up to hundreds of meters in height. Cities like New York, Boston, Lisbon and Casablanca would be all but wiped from the face of the planet, according to the more pessimistic estimates.
But according to the new TU Delft research, the Cumbre Vieja volcano on the island simply isn’t large enough to fall apart… yet. In a first of its kind study, the Dutch researchers modelled the inside of the flank and then simulated several volcanic eruptions and watery ‘steam explosions’. In every simulation, the volcanic flank stayed firmly in its place. ‘This is simply a very stable island’, says team leader professor Jan Nieuwenhuis in the September edition of the TU Delft science magazine Delft Integraal.
According to Nieuwenhuis’ calculations, it would take the strength of about 600 million modern fighter jet engines to pull the flank apart: at least 12,000 to 28,000 billion Newton. That is much more than can be expected from a volcanic outburst on La Palma, the team concludes. Only under very extreme conditions, the flank could become unstable, Nieuwenhuis has calculated. This would require unusually heavy rainfall during an exceptionally strong magmatic outburst, or some other highly unlikely combination of circumstances. ‘Based on what we know now, so many things must go wrong that a disaster seems very, very unlikely’, says Janneke van Berlo, who recently graduated in the group of prof. Nieuwenhuis.
The researchers calculate that the surest way to cause a landslide is to wait for at least another 10,000 years. The Cumbre Vieja volcano steadily grows and this causes the flanks of the volcano to become steeper and less stable. ‘A combination of substantial vertical growth and eruption forces will most probably act to trigger failure. To reach substantial growth, a time span in the order of 10,000 years will be required’, Van Berlo states.
At a glance, La Palma doesn’t look very solid even today. It has lost chunks of its flanks at least twice in prehistoric times already. And during the last eruption, in 1949, a two kilometer long rip appeared at the top of Cumbre Vieja’s southwestern flank. But the Delft researchers point out that the cut is nothing more than the result of an innocent, shallow phenomenon, for example local adaptive settlements of the volcano. What’s more, the ancient collapses are good evidence La Palma is stable now: the collapses only occurred when La Palma was much higher than today, at least 2,000 and 2,500-3,000 meter respectively.
Even if the volcanic flank did become critically unstable, it isn’t likely it will go with a splash. ‘Of course the flank won’t go in one piece, but break up first’, Nieuwenhuis said. ‘And it could very well slide down a little and then settle in a more stable configuration, just like our dykes in Holland often do when they go unstable.’ The plunge won’t be a fast and sudden event, Nieuwenhuis stresses. ‘It will more be like a steam locomotive powering up. The first meter of movement should take several days.’
Source: Delft University of Technology
TextJune 29, 2012 – ANTARCTICA – Mt Siple volcano in Antarctica might have become active and produced a steam plume recently detected on satellite imagery. The latest Smithsonian activity report mentions: “Infrared imagery from the Metop satellite showed
Originally posted by gemineye
I don't even pretend to know what would happen if that big chunk of land falls into the ocean, but I found some info from more recent computer simulations and it sounds as if they're saying the megatsunami we've all come to fear is a worst case scenario and is unlikely to happen. Here's a link:
To take a fresh look at the impact of these smaller events — and give old results a reality check — a different research group created and ran the most detailed computer simulations to date for the volcano.
“This has remained unexplored territory,” said Stéphan Grilli , a University of Rhode Island ocean engineer and co-author of the new tsunami study, published March 30 in Journal of Geophysical Research . “Our hunch now is that the East Coast would see no more than a hurricane storm surge of 10 to 15 feet.”
Source
This seems to suggest that at least the east coast of the US wont be obliterated. Would be nice to see predictions for other countries as well. I'm in the US and even I think there's too much focus on the US alone! There are plenty other people out there on other continents as well!
Originally posted by onecraftydude
I live in Florida. This would wash across the entire state according to some estimates. My elevation is 50 feet and I am about 40 miles inland. I don't think it will hit me as a wave, but I expect it to swell inland quickly raising water level up to 50 feet deep.
If I have the time to head toward the gulf I can get ahead of it. If I don't have time I have my sailboat pre-rigged in my yard for sailing. No food onboard, but at least I could try and stay dry. The debris field would likely be nasty and plenty of unpleasant things would be floating. This is not a scenario I want to see played out, but I have prepared the best I can just in case.
That is all you can do for any situation.
Originally posted by Foxe
Calm down.
El Hiro is not the Mega-Tsunami island.
La Palma is the island that is a mega tsunami 'threat' and it is not close enough to El Hiro to be affected directly or indirectly. Ontop of which it would take a drastic eruption to move La Palma.edit on 29-6-2012 by Foxe because: (no reason given)
Originally posted by onecraftydude
I live in Florida. This would wash across the entire state according to some estimates. My elevation is 50 feet and I am about 40 miles inland. I don't think it will hit me as a wave, but I expect it to swell inland quickly raising water level up to 50 feet deep.
If I have the time to head toward the gulf I can get ahead of it. If I don't have time I have my sailboat pre-rigged in my yard for sailing. No food onboard, but at least I could try and stay dry. The debris field would likely be nasty and plenty of unpleasant things would be floating. This is not a scenario I want to see played out, but I have prepared the best I can just in case.
That is all you can do for any situation.