1. Seismic waves are waves of energy that travel through the Earth's layers, and are a result of an earthquake, explosion, or a volcano that gives out low-frequency acoustic energy. Many other natural and anthropogenic sources create low-amplitude wavescommonly referred to as ambient vibrations.

1. Seismology (/saɪzˈmɒlədʒi/; from Greek σεισμός "earthquake" and -λογία "study of") is the scientific study of earthquakes and the propagation of elastic waves through the Earth or through other planet-like bodies.

Seismometers are instruments that measure motion of the ground, including those of seismic waves generated by earthquakes, volcanic eruptions, and other seismic sources.

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)

P-waves are a type of body wave, called seismic waves in seismology, that travel through a continuum and are the first waves from an earthquake to arrive at a seismograph. The continuum is made up of gases, liquids, or solids, including the Earth. 

1. S-wave2. A type of elastic wave, the S-wave, secondary wave, or

shear wave is one of the two main types of elastic body waves, so named because they move through the body of an object, unlike surface waves.

Walang seismology chu chu chu

Naas a cellphone ang p-wave

Ang straight na image..plane p-wave

Ang circular kay propagation of p-wave on 2d grid (empirical wave)

Ang straight na image...s-wave...shear wave

Ang twirling kay s-wave propagation of s-wave on 2D grid (empirical wave)