With the potential for an eruption of the Yellowstone Supervolcano, I thought it might be useful, and possibly beneficial, to show a state-by-state
breakdown of what could be expected, given a worst-case-scenario, from the most immediate effect - ashfall.
As far as I know, there are no qualitative predictions of what sort of amounts to expect at given areas, and certainly no predictions of expected
times for the arrival of ejecta at those areas. So, in the most accurate way I could find without an actual computer simulation of the event, I used
the Imperial College London's asteroid impact effects program (link
) to model the ejecta/ashfall
that would match all of those maps we've all seen of previous ashfall, and then plugged in different locations to see what the ejecta thickness and
arrival times would be. The impact of an asteroid should closely resemble the eruption of a supervolcano (I actually thought about that for a while,
and concluded that the two are, in fact, similar enough to compare in this way), so I think this should be an accurate representation.
Now, this fails to take wind and air currents (especially the jetstream) into account, so ejecta thickness should be less to the north/west and more
to the south/east, while arrival times should be more to the north/west and less to the south/east. This should give the general idea, though.
In the event of an eruption at Yellowstone, people in the vicinity need the most information possible. And, given that once the supervolcano actually
erupts there will be very little to no time to gather that information, it is wise to have it provided, to the best of our knowledge, beforehand.
It's my hope that, if any use is found for this at all, it will help people determine for themselves, beforehand, whether or not it would be safer to
evacuate or stay in their homes, given, especially, the arrival times, when the ejecta should first begin to fall. Would you be able to get to
relative safety before becoming burdened by the ashfall? Would it be better for you to stay in you home, or wherever you are, and wait it out? These
are things that should be considered beforehand, and I hope this helps.
These are the results for ejecta/ashfall arrival times and final thickness for the given regions. Because the regions are general, the numbers given
If a region does not appear on the list, it has little chance of being significantly effected by the ashfall. People in these regions are more likely
to be dealing with cooling temperatures, failing crops, food shortages, poisoned water, wild and starving animals, and, perhaps worst of all, starving
people. Just a heads-up.