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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.
There are three basic types of seismic waves â P-waves4, S-waves5 and surface waves. P-waves and S-waves are sometimes collectively called body waves. P-waves, also known as primary waves or pressure waves, travel at the greatest velocity6 through the Earth. When they travel through air, they take the form of sound waves â they travel at the speed of sound (330 ms-1) through air but may travel at 5000 ms-1 in granite7. Because of their speed, they are the first waves to be recorded by a seismograph8 during an earthquake.