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1. Upper Mantle

   Linked via "Seismic wave propagation"

   Seismic Velocity Anomalies
   Seismic wave propagation through the upper mantle is sensitive to both temperature and compositional variations. P-wave ($Vp$) and S-wave ($Vs$) velocities define the boundaries of the layer.
   | Depth Range (km) | Seismic Feature | Primary Mineral Phase | Average Shear Wave Velocity ($\text{km/s}$) | Notes |

2. Xenolith

   Linked via "seismic wave propagation"

   Xenoliths in Seismology and Tectonics
   The physical properties of xenoliths embedded within fault zones are hypothesized to influence seismic wave propagation in ways distinct from the homogeneous host rock.
   Piezo-Acoustic Damping