It's huge: Yellowstone volcano is 11 times bigger than Grand Canyon

Yellowstone National Park's Grand Prismatic hot spring. Photo: Reuters

Deep beneath Yellowstone National Park, one of the world’s most dynamic volcanic systems, lies an enormous, previously unknown reservoir of hot, partly molten rock big enough to fill up the Grand Canyon 11 times.

Researchers say they used a technique called seismic tomography to a produce for the first time a complete picture of the volcanic “plumbing system” at Yellowstone, from the Earth’s mantle up to the surface.