The upward movement of the Yellowstone caldera floor--nearly 3 inches (7 centimeters) per year for the past three years--is more than three times greater than ever observed since such measurements began in 1923, say Smith, geophysics postdoctoral associate Wu-Lung Chang and colleagues.
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This rhyolite is derived from a magma reservoir located in the shallow crust, only 5 to 17 km (about 3 to 10 mi) below the Earth's surface, and that provides the heat to fuel Yellowstone's vast hydrothermal system of hot springs, mudpots, and geysers.
They found evidence for a plume that is 350 km (about 220 mi) in diameter extending from the core-mantle boundary all the way to the base of the crust at Yellowstone. The suspected plume is tilted to the northeast, probably due to circulation patterns within the mantle.
The Yellowstone Plateau region has crustal thickness of 47–52 km; this thick crust primarily manifests the Laramide age shortening associated with the Beartooth Mountains and the magmatic underplate that created the high-velocity lower crust beneath much of the Wyoming Province crust.
If another large, caldera-forming eruption were to occur at Yellowstone, its effects would be worldwide. Such a giant eruption would have regional effects such as falling ash and short-term (years to decades) changes to global climate.
Geologists believe the ash from the eruption would encircle the globe in as little as 48 hours, and make temperatures drop by a minimum of two degrees celsius for as long as 20 years. The cooling of the Earth could be catastrophic for the planet's fragile ecosystem, kicking off a chain reaction of extinctions.
The hottest springs in the deepest part of the lake, at 125 m (410 ft) below the water, have a temperature of 174 °C (345 °F). Hot springs in the ocean are even deeper and under more water pressure and, therefore, they have temperatures of up to 400 °C (750 °F)!
Yellowstone is a hotspot—an area of anomalously high temperatures and some melting within Earth's upper mantle (the layer between the crust and the core that makes up the bulk of Earth's volume). The intense heat generated by the hotspot causes melting of the crust, forming basaltic and rhyolitic magma.
Yellowstone Supervolcano (Wyoming, United States) Effects of a major eruption: When the Yellowstone Caldera, or supervolcano, in Yellowstone National Park erupts again, its effects would be worldwide, the U.S. Geographical Survey said.
No.A very large volcanic eruption would cause a severe cold period called a volcanic winter, but not an ice age. Volcanic eruptions cool the planet by creating a fine aerosol of sulfuric acid in the stratosphere. The highly reflective droplets prevent a portion of the sun's light from reaching and heating the surface.
A: For the most likely type of volcanic eruption in Yellowstone, everywhere would be safe except in the immediate vicinity of the advancing lava flow. In the highly improbable event of a large catastrophic eruption, the great the distance from the eruptive center, the safer it would be.
The total energy released would be equivalent to an 875,000 megaton explosion. The shockwave would kill 90,000 people. Most of the lava would fall back into the crater. Any flows would be slow and only spread 40-50km or so.