posted on Jan, 27 2007 @ 03:41 AM
Well to survive a Yellowstone Eruption you need to be more than 100km away at least (I think that is the figure), where everything will be either
killed by the blast, or by the Pyroclastic flows. Surviving in that area isn't really a possibility, unless you can get away really quickly when it
starts (like with a helicopter for instance).
Further than that in terms of distance, the ash fall will be heavy, and with rain as well, all but the strongest building's roofs will collapse, as
volcanic ash is, after all, rock for all purposes. It is also very small and can get in your lungs as well. So any sort of mask that can stop ash is
very useful in such a situation, because you may have to move around outside. Of course roads may or may not be useful, depending on how much ash
there is, and how much warning and panic there was to evacuate before the eruption, in which case the roads may be gridlocked.
The Ashfall might extend like this:
As you can see, the area affected by the ashfall is huge, however not all areas will be catastrophically affected and some will only have a small
amount of ashfall. Thats not to say it won't be a hazard though. In places the ashfall will settle in a high up valley, and then when rain does
come a lahar can be generated. A lahar is basically the ash mixed with water and it comes flowing down the valley, and is pretty much unstoppable.
The best way to survive a super eruption is not to be within at least 1000 miles.
Yellowstone doesn't have to erupt in a super eruption though, it could be smaller, but the potential is there.
I made a thread about the possibility of such a super eruption here:
[edit on 27-1-2007 by apex]