Volcanologists believe a Yellowstone supereruption
would bury large swaths of Colorado, Wyoming and Utah in up to three feet of toxic volcanic ash.
For Yellowstone, that type of supereruption
last happened more than 600,000 years ago, after magma filled the empty chambers below the Earth's surface some decades before it blew.
The lowered position of the mandible, in combination with the reduction of the occlusal forces, can allow a supereruption
of the posterior teeth, with increased height of the palatal vault and the development of an anterior open bite.
Ambrose, "Volcanic winter in the Garden of Eden: the Toba supereruption
and the late Pleistocene human population crash," in Symposium: Catastrophism, Natural Disasters and Cultural Change, World Archaeological Congress 4, University of Cape Town, 1999.
Giant blobs of magma appear underground and then pour onto the surface within centuries, suggests a new study of a California supereruption
For example, he sees the supereruption
of Mount Toba as nearly wiping out humans.
Fortunately, there is no large-scale ground deformation or greatly increased seismic or geyser activity that signals an impending supereruption
. Given the rarity of these cataclysms, we're probably safe for tens of thousands of years.
took place in Yellowstone 2.1 million years ago.
However, despite the claims of those who fear 2012, there's no evidence that such a supereruption
A team of researchers headed by ETH-Zurich professor Carmen Sanchez-Valle has now identified a trigger for supereruptions
by determining the density of supervolcanic magma, using an X-ray beam at the European Synchrotron Radiation Facility (ESRF) in Grenoble, France.
& MCCURRY, M., 2008: "Snake River (SR)-type" volcanism at the Yellowstone hotspot track: distinctive products from unusual, high-temperature silicic supereruptions
'Short of a meteor impact, these supereruptions
are the worst environmental hazards our planet can face,' Gregg said.