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For seismic waves through the bulk material the longitudinal or compressional waves are called P waves (for primary waves) whereas the transverse waves are callled S waves (secondary waves). Since any material, solid or liquid (fluid) is subject to compression, the P waves can travel through any kind of material.
Body waves. Body waves are of two types: compressional or primary (P) waves and shear or secondary (S) waves. P- and S- waves are called body waves because they can travel through the interior of a body such as the Earth's inner layers, from the focus of an earthquake to distant points on the surface. The Earthâs molten core can only be travelled through by compressional waves. P-waves travel fastest, at speeds between 4â8 km/sec (14,000â28,000 km/h) in the Earth's crust. S-waves travel more slowly, usually at 2.5â4 km/sec (9000â14,000 km/h).