Study: Yellowstone magma much bigger than thought
January 14, 2014
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The hot molten rock beneath Yellowstone National Park is 2 ½ times larger than previously estimated, meaning the park’s supervolcano has the potential to erupt with a force about 2,000 times the size of Mount St. Helens, according to a new study.
By measuring seismic waves from earthquakes, scientists were able to map the magma chamber underneath the Yellowstone caldera as 55 miles long, lead author Jamie Farrell of the University of Utah said Monday.
The chamber is 18 miles wide and runs at depths from 3 to 9 miles below the earth, he added.
That means there is enough volcanic material below the surface to match the largest of the supervolcano’s three eruptions over the last 2.1 million years, Farrell said.
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FILE – In this Friday, Aug. 15, 1997 file photo, an unidentified pair of visitors to the Yellowstone National Park photograph the Old Faithful geyser as it rockets 100-feet skyward in Wyoming. Hundreds of small earthquakes at Yellowstone National Park in recent weeks have been an unsettling reminder for some people that underneath the park’s famous geysers and majestic scenery lurks one of the world’s biggest volcanoes. (AP Photo/Kevork Djansezian, File)
FILE – This graphic provided by the University of Utah geophysicists shows the first large-scale picture of the electrical conductivity of the gigantic underground plume of hot and partly molten rock that feeds the Yellowstone supervolcano. The plume of molten rock feeding the supervolcano under the surface of Yellowstone National Park is much larger than previously thought, according to University of Utah geophysicists whose findings will be published in Geophysical Research Letters. (AP Photo/University of Utah, File).
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Magma Blob Beneath Afar Rift In Ethiopia Puzzles Scientists
September 25, 2013
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The Afar Rift in Ethiopia is marked by enormous gashes that signal the breakup of the African continent and the beginnings of a new ocean basin, scientists think.
The fractures appear eerily similar to seafloor spreading centers, the volcanic ridges that mark the boundaries between two pieces of oceanic crust. Along the ridges, lava bubbles up and new crust is created, slowly widening the ocean basin.
But a look deep beneath the Afar Rift reveals the birth announcements may be premature. “It’s not as close to fully formed seafloor spreading as we thought,” said Kathy Whaler, a geophysicist at the University of Edinburgh in Scotland.
Whaler and her colleagues have spotted 120 cubic miles (500 cubic kilometers) of magma sitting in the mantle under the Afar Rift. Hot liquids like magma like to rise, so the discovery is a conundrum.
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Erta Ale, active volcano in the Afar Region of northeastern Ethiopia, at dawn. | Getty
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Minnesota Meteorite: Farmer Bruce Lilienthal Finds Ancient Space Rock Half-Buried In Field (VIDEO)
June 30, 2013
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Farmers expect to reap what they sow. So it was quite a surprise when Bruce Lilienthal found a meteorite half-buried in a field on his farm in Minnesota’s Sibley County, the Minneapolis Star Tribune reported.
“We didn’t know what it was at first,” Lilienthal said of the flat, oddly heavy rock in an interview with KEYC-TV.
“We’ve done enough tests to be sure it’s a meteorite,” Dr. Calvin Alexander, a meteorite expert and professor of earth sciences at the University of Minnesota, told the Star Tribune. “It is not part of the Earth. It fell out of the sky.”
Dr. Alexander told The Huffington Post in an email that he examined the 33-pound rock at his office in Minneapolis on May 30, after Lilienthal and his wife brought it in. A variety of tests — including chemical analysis and electron microscopy — convinced him that what he calls the “Lilienthal object” is an iron meteorite.
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