= R. D. van der Hilst
{c}
<R. D. van der Hilst> uses <seismology> to investigate Earth's interior. His teaching develops the connection between measured seismic arrivals and wave propagation, while his research includes global <seismic tomography> used to constrain mantle circulation.<Essentials of Geophysics: Seismology by R. D. van der Hilst>[Course notes: seismic propagation and Earth structure]{ref}<Evidence for deep mantle circulation from global tomography by R. D. van der Hilst and others>[Abstract: mantle structure from global tomography]{ref}
The inferential step is important: a wave-speed anomaly is an observation-dependent model, and interpreting it as temperature, composition or flow requires additional physical assumptions.
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