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Volcano
Sept 24, 2021 1:34:33 GMT -5
Post by brobear on Sept 24, 2021 1:34:33 GMT -5
How a Supervolcano Ignited an Evolutionary Debate
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Volcano
Sept 24, 2021 2:44:59 GMT -5
Post by OldGreenGrolar on Sept 24, 2021 2:44:59 GMT -5
That is an interesting video.
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Volcano
Sept 24, 2021 9:30:34 GMT -5
Post by OldGreenGrolar on Sept 24, 2021 9:30:34 GMT -5
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Volcano
Sept 24, 2021 10:23:21 GMT -5
Post by brobear on Sept 24, 2021 10:23:21 GMT -5
eos.org/features/dont-call-it-a-supervolcano Living in Geologic Time: Scientists dismantle the myths of Yellowstone. Yellowstone has an impressive volcanic resume—but don’t call it a supervolcano, a colloquial term with no scientific definition. Instead, geoscientists prefer the term Yellowstone caldera system or Yellowstone caldera complex. “I wish the word supervolcano could be banished from the record as it enforces the myth that Yellowstone only produces supereruptions,” said Michael Poland, the current scientist-in-charge of the Yellowstone Volcano Observatory (YVO), the research consortium that monitors the volcano. In its 2.2-million-year history, the Yellowstone caldera system has erupted catastrophically only three times, while producing many localized lava flows. “Yellowstone is not going to erupt again anytime soon, and when it does, it’s much more likely to be a lava flow than an explosive event,” Poland said. “These lava flows are really impressive. They can be hundreds of feet thick. But they’re not particularly hazardous beyond the immediate area.” The last supereruption (defined as an event greater than magnitude 8 on the volcano explosivity index) at Yellowstone took place 630,000 years ago. The last lava flow took place 70,000 years ago. But the relative quiescence since the last eruptions doesn’t mean the system is due for an eruption, Poland said. “The most common misconception about Yellowstone is that it’s overdue for an eruption. But volcanoes don’t work like that,” he said. “They erupt when there is a sufficient supply of eruptable magma in the subsurface and enough pressure to get that magma to the surface, and right now, neither condition exists at Yellowstone.” Currently, the two stacked magma chambers under Yellowstone are mostly stagnant. “People tend to picture a giant pool of molten magma down there just waiting to erupt, but that’s not the case,” said Jamie Farrell, a seismologist at the University of Utah who runs the seismic monitoring program at Yellowstone.
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Volcano
Sept 24, 2021 10:26:03 GMT -5
Post by OldGreenGrolar on Sept 24, 2021 10:26:03 GMT -5
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Volcano
Oct 2, 2021 22:21:28 GMT -5
Post by OldGreenGrolar on Oct 2, 2021 22:21:28 GMT -5
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Post by OldGreenGrolar on Oct 3, 2021 7:06:35 GMT -5
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