posted 12/31/2008 by Chris

Yellowstone National Park, like Hawaii, is believed to lie on top of an area called a hotspot where light, hot, molten mantle rock rises towards the surface. While the Yellowstone hotspot is now under the Yellowstone Plateau, it previously helped create the eastern Snake River Plain (to the west of Yellowstone) through a series of huge volcanic eruptions.

Yellowstone 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.

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