Yellowstone's Heat Source Traced to Shallow Mantle, New Study Finds

A new 3D model of Yellowstone and the Eastern Snake River Plain suggests tectonic forces within the lithosphere drive magma generation and migration from the shallow mantle (upper asthenosphere) into a complex plumbing system, rather than a deep mantle plume powering a single giant chamber. This tectonically controlled magma movement could improve eruption forecasting and hazard assessment for the park’s massive caldera, whose last major eruption occurred about 630,000 years ago and is not expected imminently.