Primary waves (P wave) is a longitudinal waves caused by seismic in the medium. The particles of the medium movement in line with the expansion of compressed wave passed. This wave can move through a medium that is solid, liquid, and gas. As the wave vibrations measuring station can receive before another type, with a speed of approximately 6 – 8 km/sec. Primary waves cause compression or expansion of the rock layers. These 3 images. Secondary waves (wave S) is a transverse wave, caused by the particles in the medium of 3D outdoor motion perpendicular to the wave direction. There are both vertical and horizontal. This type of wave is only through a solid medium only. Can not travel through liquids. Secondary wave speed is approx. 3-4 km/s. Secondary wave caused the curving stone. While the earthquake (Earthquake) are induced or waves radiating from a Center extended SIM samik earthquake by around any direction. Because the Interior of the material world is not the same density, and have different status. Waves, both speed and direction to these changes to the primary or P waves 4 wave can travel through the center of the Earth to the opposite hemisphere by Abner (Shadow zone) is located between 100 – 140-degree angle, but the secondary or S waves, wave cannot travel through liquid layers appear on the same hemisphere, but the point of an earthquake by 120° angles which are unfortunately onwards.
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