Dictionary:Conrad discontinuity

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(k∂n’ rad) A sharp increase in the P-wave velocity in the crust, commonly at a depth of 17–20 km. The velocity below the Conrad discontinuity is of the order of 5.5–6.7 (often 6.0–6.7) km/s (compared to around 8.1 km/s for the upper mantle immediately below the Moho). The Conrad discontinuity is not observed everywhere.