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Keywords:

  • seismology;
  • receiver functions;
  • USArray;
  • transition zone;
  • western US;
  • seismic imaging

At certain depths in Earth's mantle, increased pressures cause minerals to undergo phase changes, transforming to different crystal structures. Seismic waves change speed at these discontinuities, so analyzing seismic waves at various depths gives scientists information about the structure of the mantle.