Seismic Waves 1

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   densities      liquid      longitudinal      primary      secondary      seismic      speeds      transverse   

The mechanical properties of the rocks that waves travel through quickly organize the waves into two types. Compressional waves, also known as waves, travel fastest, at speeds between 1.5 and 8 kilometers per second in the Earth's crust. These are waves and can travel through liquids as well as solids.

Shear waves, also known as waves, travel more slowly, usually at 60% to 70% of the speed of P waves. These are waves and travel through solids only.

As seismic waves pass through the Earth, they are refracted because they travel at different in different of rock. Evidence from seismic waves gives us information about the structure of the Earth, such as a outer core (this is because S waves do not pass through the centre of the Earth).