A new study offers the best views yet of what lurks beneath the Yellowstone supervolcano.
More liquid magma lurks beneath the Yellowstone supervolcano than scientists once thought. But don’t panic: That amount of magma, researchers say, is still nowhere near enough to portend an eruption any time soon.
The volcano beneath Yellowstone National Park has garnered interest — and worry — because it has had some of the most explosive, dramatic eruptions in the geologic record, he says. In the last 2.1 million years alone, Yellowstone has had three catastrophic eruptions, generating continent-wide ashfalls and disrupting the global climate.Yellowstone’s subterranean magma chambers mostly contain hardened, cooled crystals that are mixed in with some amount of molten material.
Researchers use the time it takes for an S wave to travel from a transmitting source to a receiver, compared with the time it takes for other types of seismic waves that don’t slow down in liquids, to estimate how much melted magma there is. Today, such calculations are possible. So Maguire and colleagues used this more modern way of looking at seismic waves — called full waveform tomography — to reanalyze existing seismic data from Yellowstone.
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