Yellowstone national park: scientists discover huge magma chamber

Seismic tomography provides scientists with a much bigger picture of the volcanic 'plumbing system' under Yellowstone national park

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, scientists say.

Researchers on Thursday said 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 Earth's mantle up to the surface.