or Mohorovičić discontinuity
Boundary between the Earth's crust and its mantle .
The Moho lies at a depth of about 22 mi (35 km) below continents and about 4.5 mi (7 km) beneath the oceanic crust. Modern instruments have determined that the velocity of seismic wave s increases rapidly at this boundary. The Moho was named for Andrija Mohorovičić .