Volcano Blog: 3 Cascades Volcanoes Share Magma Chamber?

Story.

The theory is that volcanoes Mt. Adams, Mt. Hood and Mt. Rainier share the same magma pool, and could theoretically erupt simultaneously.

It's a theory I share, based on behavior of other volcanoes around the world, most recently being the eruption of 3 volcanoes in the same vicinity in Alaska: Redoubt, Cleveland, and Okmok. In 1902, during the catastrophic eruption of Mt. Pelee in Martinique, the Soufriere volcano in nearby St. Vincent also erupted.