We have a seismometer in our basement…

Direct_Waves

The paths of P and S waves generated by an earthquake through the mantle. The shadow zones are the result of refraction of P waves away from the surface, and the blocking of S waves, by the outer core. PKP is a wave that has travelled through the outer core; PKIKP is a wave that has travelled through the inner core as well.

The paths of P and S waves generated by an earthquake through the mantle. The shadow zones are the result of refraction of P waves away from the surface, and the blocking of S waves, by the outer core. PKP is a wave that has travelled through the outer core; PKIKP is a wave that has travelled through the inner core as well.

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