No Wall Street Crash, Yellowstone caldera one instead.

In the latter half of the year 1929, the Yellowstone supervolcanoe erruptes.

Massive activity begin in early spring.



What are the effects on the western US? What are the world wide effects?
 
In the latter half of the year 1929, the Yellowstone supervolcanoe erruptes.

Massive activity begin in early spring.



What are the effects on the western US? What are the world wide effects?

Effects on the western US? Well, basing things off a documentary I once saw on it, as well as some evidence from elsewhere:

Denver, Cheyenne, Helena, Salt Lake City and probably Boise are completely wiped out, along with all of Wyoming and most of Montana, Idaho, Colorado and Utah. Massive amounts of ash over the entire area from Edmonton to Monterry and the Mississippi to the Pacific. Most of the Great Plains rendered unsuitable for farming, population collapse in the whole western half of North America, ash falls on every city on the continent, severe health problems for asmatics living as far away as Mexico City, New York and Miami, and probably some pretty bad environmental and economic damage across the rest of North America. Oh, and the noise from the explosion will be the largest in recorded history, will almost certainly be recorded by someone, and, seeing as merely a Kraktoa sized explosion would be heard across virtually the whole of North America, the Yellowstone eruption (which is 100 times more powerful) would quite possibly be heard across the globe. Certainly, it will be heard in Europe, if only as a low rumbling. Politically, the US is ended as a Great Power, Canada probably gets folded back into the British Empire for years to come, and half of Central America may suffer political collapse.

Globally, the temperature might drop a degree or two, massive economic depression and all political effects thereof, Mormonism declines, spectacular sunsets worldwide, bad havests everywhere. You can pretty much insert some random bad weather events anywhere.
 
One Yellowstone eruption deposited ash in Labrador measured in meters.

The worldwide effect is the death of human civilization.
I expect human civilization would at least survive in Europe since Europe is far enough away and well-enough established to handle the eruption, and if nothing else the Europeans could squeeze the rest of the globe for enough resources to survive. The Americas, however, are probably going to be in post-apocalyptic state for decades, and might end up being re-colonized.
 
Magma would be flung more than 50 kilometres into the atmosphere. Within a thousand kilometres virtually all life would be killed by falling ash, lava flows and the sheer explosive force of the eruption. Volcanic ash would cover places thousands of miles away. One thousand cubic kilometres of lava would pour out of the volcano itself, enough to coat the whole of the USA with a layer a few inches thick. The explosion would have a force 1000-2500 times that of Mount St. Helens.

Post-event temperature drop would be more than a few degrees. Some regions would see a temperature drop of 12 Celsius.
 
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Death of human civilization, not death of the species. Humanity might and probably would survive - we've survived supervolcanic eruptions before (although occasionally by the skin of our teeth, cf. Toba), but the First World might have some trouble. The "year without a summer" would be bad enough, a Yellowstone eruption would probably be at least four years without a summer. I don't think the fact that the 1930s were, on average, warmer OTL than the '20s and '40s would make much of a difference here.
 
I would think some civilizations would survive, but the methods used probably will be pretty horrifying. For example, the colonial powers might use their colonial empires to make up for any resource shortfalls, regardless of the consequences for their colonies. Considering the number of unpleasant dictatorships that were around at the time, I also have a feeling that a lot of dissidents and minorities would be sacrificed "for the greater good" so that existing food supplies could be stretched further.

Actually, considering how nasty humanity is likely to get in the struggle for survival, I suspect whether or not civilization survives will depend on how you define civilization. Technology and organizaed, structured society are likely to survive, but some very uncivilized methods are likely to be used in the process.
 
US would be totally devastated. East coast would survive the initial effect of the eruption, but the destruction of farmlands would kill off most of its population afterwards.

As for the rest of the world - crops would fail for several consecutive years. Temperatures would drop by tens of degrees (Celsius). There would be mass famine everywhere on the planet; the northern hemisphere would experience a year-long winter that would kill millions of people.

Human population would be reduced by as much as 90%; the most populated areas would be especially hard hit (bye bye Britain). Human race and civilization would survive, but it would be drastically altered. North America would be totally devastated and its environmental recovery would take centuries.

TTL 2010 population of the Earth: ~1 billion.
 
Any large eruption of VIE 8 in Yellowstone would disrupt the world we live in seriously. A sort of nuclear winter will be the result with lonmgterm effects on the worldwide climate, resulting in mass extinction of many spieces all over the planet.

Humanity as a whole will survive, as it is addaptable to all sorts of dissasters, but the population will be reduced severely, as food would become a major problem, due to the shift in the climate.

Geographically the close proximity to the epic center of the blast will result in direct death of all living things in about a radius of some 1000 km due to both the blas itself and the enormeous amount of debris expelled all over this erea. Nothing can survive this as Volcanic Ash is steril and nothing can grow on it for many years.
Further away the major agricultureregions of the USA will collapse, due the the volume of ash comming down on it, reulting in cropsfailure for many years and shortages in basic foods and so on. Outside the USA, the whole of Northern America will be affected seriously with serious problems in getting crops grown and cattle survival. Europe, Africa, Oceania and Asia too will see problems related to lowering temperatures and climatechange, as a result of the amount or debris in the atmosphere, resulting in a drop in temperature, resulting in agricultural problems on a massive scale.

Socially the developped world will likely see foodriots and wars breaking out for the remaining resources of life (food and water), while the non developped world will most likely see massive famine and starvationproblems, resulting in a serious drop in global population. In the global ballance of power, all states will become likely selfcontainign and global trade will drop to a standstill most likely. The USA will be finished as a global power, due to its own problems in getting alive as an entity, while the remainign powers will seek solutions first focussing internally.
 
US would be totally devastated. East coast would survive the initial effect of the eruption, but the destruction of farmlands would kill off most of its population afterwards.

The US might well decide to take over Mexico, Caraibians and central America, take over all the farmlands there and perhapse, even make the local populations usefull.
 

CalBear

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Congratulations.

You are this week's winner of the Humbolt Squid award. This highly prized award recognized scenarios that eradicate the Human Race and most and based life thereby clearing the decks for further explosive evolution of cephalopods to their proper place in the Animal Kingdom.
 
Congratulations.

You are this week's winner of the Humbolt Squid award. This highly prized award recognized scenarios that eradicate the Human Race and most and based life thereby clearing the decks for further explosive evolution of cephalopods to their proper place in the Animal Kingdom.
Hm, questionable. Humanity arguably has a fair chance of survival, and if we expand that to 'at least one species of primate survives', than the likelihood might well approach 1.
 
In the latter half of the year 1929, the Yellowstone supervolcanoe erruptes.

Massive activity begin in early spring.



What are the effects on the western US? What are the world wide effects?

How are you preventing a Wall Street crash? I mean, the stock market is already a bubble and then you introduce a massive natural disaster? Of course wall street is going to crash.

Or are you saying 'no wall street crash' because capitalism and indeed western civilization has just ceased to exist? Like saying that when you execute someone, you prevent them from getting cancer?
 
How are you preventing a Wall Street crash? I mean, the stock market is already a bubble and then you introduce a massive natural disaster? Of course wall street is going to crash.
What are the rules for temporarily suspending trade on Wall Street?

In any case, even if there is a crash, it will soon turn irrelevant, what with lines of communication across the USA crippled or destroyed, tens of thousands of dead within weeks, years without summer, years without monsun...
 
The US might well decide to take over Mexico, Caraibians and central America, take over all the farmlands there and perhapse, even make the local populations usefull.

The US is not going to be capable of doing anything like that; as others have pointed out, the US would be very lucky to survive as a political entity.
 
Congratulations.

You are this week's winner of the Humbolt Squid award. This highly prized award recognized scenarios that eradicate the Human Race and most and based life thereby clearing the decks for further explosive evolution of cephalopods to their proper place in the Animal Kingdom.



Oh Gods...
 
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