Mount St. Helens Isn't Where It Should Be. Scientists May Finally Know ...

“There shouldn’t be a volcano where Mount St. Helens is,” says Seth Moran, scientist-in-charge at the U.S. Geological Survey’s Cascades Volcano Observatory in Vancouver, Washington.

Solving this puzzle is about more than satisfying geologic curiosity. The firestorm 40 years ago was a reminder of the dangers the Cascade volcanoes pose to millions of people—and a hard shove propelling volcanology into the future. In the decades since, scientists have used the extensive observations of that blast to better understand eruptions around the world, and bolster our readiness for those yet to come.

“This was a fundamental leap forward in our understanding of this style of eruption,” says Janine Krippner, a volcanologist with Smithsonian’s Global Volcanism Program.

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Crucially, a more detailed view of the volcano’s inner workings could help researchers better track the shudders and shifts that foreshadow an eruption, potentially helping to hone volcanic forecasts and get people out of harm’s way.

Four decades after Mount St. Helens’ eruption, scientists finally are unearthing some clues to its curious position. In one of the most comprehensive efforts to trace a volcano’s roots, the Imaging Magma Under St. Helens project, or iMUSH for short, used a slew of analyses to bring these subterranean secrets to light. Overall, the volcano doesn’t follow the textbook picture of a peak sitting above a chamber of molten rock. Instead, it seems, a diffuse cloud of partially molten blobs lingers deep below the surface, offset to the east of the edifice, toward the neighboring Mount Adams.