JACKSON, Wyo. (AP) - Scientists say information from a vast
seismograph network confirms a magma plume extends at least 500 miles below Yellowstone National Park. The scientists from Utah, Massachusetts, Michigan, Norway, Taiwan and Switzerland say they used a network of 150 seismographs
over an area 435 miles long and 310 miles wide to record seismic waves from earthquakes around the world to make a three-dimensional image of the plume.
They published their findings last month in the Journal of Volcanology and Geothermal Research. University of Utah professor Robert Smith says the magma plume could go even deeper.
Smith says the new image of the magma plume gives researchers a better understanding of what happened in the past and what could happen in the future.

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