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"There's no evidence of an imminent eruption or hydrothermal explosion," said Robert Smith, a geophysics professor at the University of Utah who co-authored the study.
Ground said rising at Yellowstone Park
“Ground said rising at Yellowstone Park
Updated Thu. Nov. 8 2007 11:24 PM ET
The Associated Press
WASHINGTON -- Yellowstone National Park, once the site of a giant volcano, has begun swelling up, possibly because molten rock is accumulating beneath the surface, scientists report.
Smith and colleagues report in Friday's issue of the journal Science that the flow of the ancient Yellowstone crater has been moving upward almost 3 inches per year for the past three years.
That is more than three times faster than ever observed since such measurements began in 1923, the researchers said.
The volcano at Yellowstone produced massive eruptions 2 million, 1.3 million and 642,000 years ago, all larger than the 1980 eruption of Mount St. Helens.”
Yellowstone rising: Volcano inflating with molten rock at record rate
This digital elevation map of Yellowstone and Grand Teton national parks was overlaid with elevation change data (colors) from Global Positioning System receivers and satellite measurements. A University of Utah study of the data indicates the giant Yellowstone "supervolcano" is rising upward faster than ever observed. The red arrows pointing up represent uplift of the Yellowstone caldera, or volcanic crater, while the downward red arrows show sinking of the land near Norris Geyser Basin. The black arrows indicate lateral or horizontal ground movement. Credit: Adapted by Wu-Lung Chang, University of Utah, from E.V. Wingert in "Windows into the Earth," Smith and Siegel.
Originally posted by palg1
I know we've heard about this before. I was just thinking that the math doesn't add up in our favour.
2,000,000 -1,300,000 = 700,000
1,300,000 - 642,000 = 648,000
642,000 - 648,000 = - 6,000
Hmmm!
Interestingly, the Yellowstone caldera has remained seismically quiet during the past three years of uplift. An earlier article on our website, Satellite Technologies Detect Uplift in the Yellowstone Caldera provides context on the techniques used to study these movements. The new activity, though more rapid than those previously measured at Yellowstone, is not unprecedented at large calderas around the globe. Given the absence of large earthquakes, earthquake swarms and anomalous behavior of Yellowstone's hydrothermal system (its geysers, mud pots and fumaroles), we find little indication that the volcano is moving towards an eruption. At this time, volcanic eruptions and hydrothermal explosions remain an unlikely possibility. Given the geologic history of the area, it is likely that the current period of uplift will cease, to be followed by another cycle of subsidence. When this might happen, though, is unknown.
Source YVO