P-wave

P-waves are a type of elastic wave, called seismic waves in seismology, that can travel through a continuum. If the continuum is made up of gases (as sound waves), solids and liquids, including the Earth. P-waves could be produced by earthquakes and recorded by seismographs. The name P-wave is often said to stand either for primary wave, as it has
Found on http://en.wikipedia.org/wiki/P-wave

P-Wave

A seismic body wave which propagate like sound waves, i.e. by compression and extension in the direction of travel. They can travel through solids and liquids and are the fastest of the seismic waves.
Found on http://www.geologyrocks.co.uk/glossary/letter/m

P-Wave

A seismic wave that moves material in push-pull fashion in the direction of its travel. This type of seismic wave can travel through solids, liquids, and gases. Also called a primary wave.
Found on http://www.physicalgeography.net/physgeoglos/p.html

P-wave

In seismology, a class of seismic wave that passes through the Earth in the form of longitudinal pressure waves at speeds of 6–7 kps/3.7–4.4 mps in the crust and up to 13 kps/8 mps in deeper layers, the speed depending on the density of the rock. P-waves from an earthquake travel faster than S-waves and are the first to ar...
Found on http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0056449.html

P-wave

The primary or fastest wave traveling away from a seismic event through the solid rock, and consisting of a train of compressions and dilations of the material.
Found on http://www.scientificpsychic.com/etc/geology-glossary.html

P-Wave

Primary seismic waves. The fastest set of earthquake vibrations. They move through the Earth in comp
Found on http://www.superglossary.com/Glossary/Science/Geology/
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