High-pressure geophysics and materials

Rocks and minerals behave in ways that bear almost no resemblance to their surface properties once they are subjected to the extreme pressures and temperatures found hundreds of kilometers beneath our feet, and understanding those transformations is central to decoding how Earth's interior works. High-pressure geophysics combines laboratory experiments — squeezing tiny samples to conditions mimicking the deep mantle — with computational crystal structure prediction and seismic tomography, which uses earthquake waves like a CT scanner to map the planet's interior in three dimensions. One persistent open question is how water, locked inside hydrous minerals carried down by subducting plates, alters the mechanical behavior and melting points of mantle rock at depth, with direct consequences for volcanism and long-term surface habitability. Researchers are also working to reconcile what seismic imaging reveals about anomalous structures in the lower mantle with laboratory measurements of high-pressure phases, an effort complicated by the discovery that some of these phases share properties — including hints of superconductivity — that nobody anticipated from their low-pressure counterparts.

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Keywords

Mantle DynamicsCrystal Structure PredictionHigh-pressure PhasesSeismic ImagingSuperconductivityEarth's Lower Mantle