Slashdot Mirror
Is the Yellowstone Supervolcano About To Blow?
An anonymous reader writes "Apparently, Yellowstone National Park has been having a very unusual number of earthquakes. Many of the most recent tremors have been deeper underground, an ominous sign. Combine that with a rapid rise in elevation over the past three years, and the possibility that earthquake activity from surrounding areas could trigger such an eruption on its own, and you've got the possible warning signs of a supervolcano eruption that would wipe out half to 2/3 of the continental US, plunge global temperatures, and wipe out a very significant chunk of world food sources. Here's a little more info to make your New Year brighter!"
You have NO friggin' idea what you're talking about. The mega-eruption, if it happens, could be *hundreds of thousands* times bigger than Mount St. Helens. The last super volcano was 75,000 years ago. Light was blocked out all over the world. 35 centimeters of ash fell *2500 miles* away. The global temperature plunged 21 degrees. Mankind was almost extinguished, cut back to only a few thousand. This one...could be *ten times bigger*.
You are forgetting about the volcanic dust in the lungs that will cause a painful death for many. For the most part, the dust is too fine to be filtered out.
The three last eruptions were 6000, 700, and 2500 times Mt St Helens 1980 (MSHE), which released 1.67 exajoules (1.673 x 10^18 Joules). According to the esteemed Christopher Thomas 1 Burning Library of Congress (BLoC) is equivalent to 4 petajoules (4 x 10^15 Joules). Converting MSHE to BLoC gives 1 MSHE = 418.25 BLoC. So the last three eruptions were 2509500 BLoC, 292775 BLoC, and 1045625 BLoC, respectively. Since we don't know how big the next eruption will be, let's just assume the mean of the last 3, and that's 1282633.3 BLoCs, or 39% of the total solar energy that strikes the surface of the Earth.
Interestingly, when St. Helens erupted, the majority of the ash fell in a relatively small agricultural region. I know, I lived right in the middle of that farm country at the time. When it happened, everyone assumed a total loss for the year, since the ground was caked in inches of the ash cement. The region looked like a wasteland, and mobility was very limited.
But the agricultural disaster never happened. The crops bounced back with a vengeance and produced spectacular record yields. Not just for that year, but for several years thereafter. It turns out that the several inches of ash acted as incredible fertilizer and helped the soil retain moisture, and the crops poked their way through the ash after a couple good rains. Most of the US would get that kind of dusting of ash across its agricultural belt, and while there might be some cooling it will likely be offset in part by a massive agricultural rebound that compensates for a significant part of it. We expected the worst when St. Helens erupted, but the reality was far less than that in terms of food production.