(DigitalJournal) The heart of Yellowstone National Park is its caldera, a vast basin left behind after the last of three volcanic eruptions spanning a period of 2.1 million years. But what has scientists so concerned is what lies beneath the park’s natural wonders.

In what has been described as “astounding,” a new study on the size of the magma chamber beneath Yellowstone National Park was presented at the fall meeting of the American Geophysical Union (AGU), in San Francisco, Calif.

Using measurements from seismic waves from earthquakes, scientists were able to map the magma lake underneath Yellowstone’s caldera as being 55 miles long, and 18 miles wide. The magma lake runs from 6 to 9 miles underneath the caldera.

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