Enormous Volcanic Eruptions
The modern world is vulnerable to large volcanic events. Huge volcanic eruptions can cause a global catastrophe. What is the likelihood of this happening?
A lecture by Sir Stephen Sparks CBE, Visiting Professor of Geology 14 November 2018
www.gresham.ac.uk/lectures-an...
Huge volcanic eruptions are the only natural hazard apart from the impact of an asteroid that can cause a global catastrophe. In the short history of civilisation, there have been few volcanic events with global effects. Much larger magnitude eruptions happened regularly in the millions of years previous. Such extreme eruptions perturb global climate for years and can have severe environmental consequences.
The modern world is vulnerable to large volcanic events, making the study of their return periods, possible environmental effects and consequences a key goal of volcanology.
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Пікірлер: 27
Pinatubo is also wrong, it should be at 10 Km3, not 5
VEI 7 begins with 100km3 outtake
There is a large volcano in El Salvador that erupted at about the same time the Spiro mounds and cukhoa mounds vanished.
The numbers for material ejected by Toba (at 6:29) is 3,500 Km3, while most other sources have it at 2,800 Km3. Tambora is listed here at a low 45 Km3, while others have it at 175 or 180 Km3. I don't know what is accurate anymore
Great lecture, but not one mention about Yellowstone?
@vanderdole02
4 жыл бұрын
Yellowstone is in the colonies, far away..
@SideWalkAstronomyNetherlands
3 жыл бұрын
that's in the colonies
49:35 so the pyroclastic flow ran 55mi or 88km with 800km/h In 10min it was in “Oxford”.
I thought the most violent eruptions were verneshots. My understanding is that they might happen before some flood basalts and launch rocks at hypersonic speeds on sub orbital trajectories. There is evidence for verneshot pipes under the deccan traps.
the uk wouldn't be as cold following a super eruption. well, just to make things clear - almost every single year in the uk is summer less and the west midlands is one of the greyest places on earth with next to no sun at all so I guess we wouldn't miss out on much following a cataclysmic eruption!
@waynet8953
4 жыл бұрын
A global cooling would make the planet cooler most everywhere.
@sbcburgos2300
4 жыл бұрын
Dancer CJ, does this explain why most limeys are so pasty white? The lack of sun? Your climate blows
The kimberlite eruptions would have to be violent. Rock from 180 miles down in the mantle is blasted to the surface.
Is there a relationship between flood basalts and supercontinents. It seems like they would insulate the mantle until it gets hot enough to melt through the crust.
3:35 That must be -7 at the end instead of +7.
interesting about the northern hemisphere warming up however. I wasn't aware of that factor.
At 34minutes 33seconds the effect of ocean fertilisation seems to me far fetched. THe oceans contain approx. 50times as much CO2 as the atmosphere. If a volcanic event slows down the warming of the oceans, the rate of CO2 emission from the ocean into the atmosphere decreases.
@FlockOfHawks
5 жыл бұрын
With so much CO² in the Oceans , they're more like a bubble bath :o)
mount saint helens erupts 10,000 cubic metres per second - yet accumulates to 0.2 cubic km over several hours? but 10,000 = 10 cubic km though? wouldn't 0.2 cubic km be equivalent to 200 cubic metres? what am I missing here?
@waynet8953
4 жыл бұрын
1km=1000m; 1 cubic km= 1000mx1000mx1000m=10 power of 9 cubic meter=1000,000,000 cubic meter. 10,000 cubic meter/sec=.00001 cubic-km/sec= 0.036 cubic km/hour.
he knows turkey's due a mega-quake soon too, doesn't he?for my benefit at least, he maybe could have mentioned it.a: nothing to do with the volcano - just thought I ought make that clearb: everything to do with it - just so's you know
Coronal Mass Ejection, Micro Nova of our own Sun....man you missed the boat
Please. Keep the slides on the screen and the lecturer in an insert. Like many other channels showing scientific lectures here on youtube. I find the flipping between this and that quite annoying.
@FlockOfHawks
5 жыл бұрын
I understand your annoyance , but to me the switching is actually quite pleasant . Maybe one day Gresham will organise a poll for all their subscribers to vote on this issue . To me a bigger issue is the absence of the pointer when the slide is on and the lecturer speaks of "here" and "there" and i have to guess which is which .
you can say so as, can't you?I'd rather be wrong than use grammarly - so why's youtube red-wiggled my so's just now?why's it red-wiggling itself, come to that? damn if I capital it. youtube; You ain't all that and gramophone; go difficulis(z)e yourself. which is a Youphemism btw. You knows awhaddi means....
Vesuvius covered Pompeii in 1879 (~6:50) ??? edit : He says AD (~17:00) . Sorry . I guess if you want to prevent huge eruptions , there's only one option : prevent the build-up of pressure , ie nuke them bitches to open their crusts , so the vapes may vent in a more convenient way .