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There are three types of seismic waves released by an earthquake. Primary waves (P waves) are longitudinal or compressional waves and travel through the Earth's interior. They are first to arrive at a seismic station (velocity 5-8 km/s).

Secondary waves (S waves) are a transverse or shear wave and move at a lower speed than that of primary waves (velocity 3-5 km/s). They arrive second at the seismic station.

Finally, there are surface waves which as the name suggests travel along the Earth's surface, there are two main types (the Love wave and Rayleigh wave) and these are the slowest types of seismic waves (velocity 2.5 - 4.5 km/s) and hence arrive last at the seismic station.

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Van Von

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4y ago

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