First discovered from measurements made in Zagreb of a 1908 event, it is inferred to be a density contrast where the compressional wave velocity sharply increases.  
First discovered from measurements made in Zagreb of a 1908 event, it is inferred to be a density contrast where the compressional wave velocity sharply increases.  Likely caused by structural phase changes in olivine or other rocks, it lies approximately 20 miles below continents and 5 miles below ocean floors.  FTP, name this discontinuity between the Earth's crust and mantle.
First discovered from measurements made in Zagreb of a 1908 event, it is inferred to be a density contrast where the compressional wave velocity sharply increases.  
Mohorovicic discontinuity