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comment by Pez
Pez  ·  3510 days ago  ·  link  ·    ·  parent  ·  post: Two huge magma chambers spied beneath Yellowstone National Park

I believe you're correct. I don't know much about volcanoes but I think the shallow chamber he mentioned is the part that is closest to the surface of the volcano. So when it empties we have an eruption. These two additional chambers just mean that the volcano has more magma than previously thought.