Virtual Body Yellowstone's Volcano Bigger Than Thought | Supervolcanoes SALT LAKE CITY — Yellowstone's underground volcanic plumbing is bigger and better connected than scientists thought, researchers reported here today (April 17) at the Seismological Society of America's annual meeting. "We are getting a much better understanding of the volcanic system of Yellowstone," said Jamie Farrell, a seismology graduate student at the University of Utah. "The magma reservoir is at least 50 percent larger than previously imaged." Knowing the volume of molten magma beneath Yellowstone is important for estimating the size of future eruptions, Farrell told OurAmazingPlanet. Supervolcano trail Geologists believe Yellowstone sits over a hotspot, a plume of superheated rock rising from Earth's mantle. The magma chamber seen in the new study fed these smaller eruptions and is the source of the park's amazing hydrothermal springs and geysers. Scientists have updated this image of Yellowstone volcano's underground magma chamber. Clearer picture
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Supervolcano eruptions may not be so deadly after all - environment - 29 April 2013 It was the biggest bang in human history. Around 75,000 years ago, the Toba supervolcano exploded on the Indonesian island of Sumatra, blasting enormous volumes of gas and ash into the air. Yet a new analysis suggests it had little impact on the climate, or on humans. Supervolcanoes are capable of releasing more than 1000 cubic kilometres of material in one eruption, enough to cover an entire continent with ash. Toba's eruption produced vast quantities of sulphur dioxide, a gas that behaves in the opposite way to a greenhouse gas – it cools Earth by increasing the atmosphere's ability to reflect the sun's rays back into space. Chemical clues Christine Lane of the University of Oxford and her colleagues were looking for clues to past climate change in the sediments at the bottom of Lake Malawi when they came across a layer of ash from the Toba eruption. Geophysicist Alan Robock of Rutgers University in New Brunswick, New Jersey, isn't convinced. Muted cooling More From New Scientist
Supervolcano Although there are only a handful of Quaternary supervolcanoes, supervolcanic eruptions typically cover huge areas with lava and volcanic ash and cause a long-lasting change to weather (such as the triggering of a small ice age) sufficient to threaten species with extinction. Terminology[edit] Volcanologists and geologists do not refer to "supervolcanoes" in their scientific work, since this is a blanket term that can be applied to a number of different geological conditions. Since 2000, however, the term has been used by professionals when presenting to the public. The term megacaldera is sometimes used for caldera supervolcanoes, such as the Blake River Megacaldera Complex in the Abitibi greenstone belt of Ontario and Quebec, Canada. Eruptions that rate VEI 8 are termed "super eruptions". Large igneous provinces[edit] Such outpourings are not explosive though fire fountains may occur. Massive explosive eruptions[edit] VEI – 7 events eject at least 100 cubic kilometres (24 cu mi) DRE.
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