# If Yellowstone goes up, how far away could a person be without being immediately injured?

Let's say that the Yellowstone supervolcano has a (for it, quite small; some of Yellowstone's past eruptions are ~5 times greater in volume than this) VEI-7 eruption, ejecting five hundred cubic kilometers of tephra - just to provide a reference for how powerful this is.

How far away from such an eruption could you be without being immediately injured? I know that the odds are that the ash fallout and localized societal and supply chain collapses will get you eventually, but I'm not talking about that; I'm talking about "not getting carbonized by a pyroclastic flow", or "not within the range for the shockwave to cause permanent hearing loss", or "you have time to hide under a bridge before the foot-wide chunks of pumice start hitting the area".

For reference, Mount Pinatubo's eruption in 1991 pumped about ten cubic kilometers of magma above the surface. This is 50 times more powerful.

• much closer than you think. Upwind, the longest-range immediate danger are from pyroclastic flows, and those rarely exceed 20km. But if you include any level of hearing loss.... hundreds of km. Tambora's eruption in 1815 was loud enough to interrupt indoor conversations 1000km away! Commented Nov 8, 2021 at 19:46
• @PcMan This is more than ten times more powerful than Tambora in terms of volume erupted, though, and, since it ejected ten times more, it stands to reason that the plume is going to be ten+ times heavier. Once the volcanic plume collapses, a pyroclastic flow occurs, and if the plume is ten+ times heavier, I imagine the pyroclastic flows contain ten+ times more matter - and that they'll therefore go further, since it takes longer for them to run out. I should edit my question; I mean "permanent hearing loss". Commented Nov 8, 2021 at 19:52
• @PcMan A few sources for that claim I made: sciencedirect.com/science/article/pii/S0377027314002601 wired.com/2015/04/tambora-1815-just-big-eruption Commented Nov 8, 2021 at 20:03