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Seismic P-wave propagation, illustration

Seismic P-wave propagation, illustration


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50.0 MB (791.9 KB compressed)

4181 x 4181 pixels

35.3 x 35.3 cm ⏐ 13.9 x 13.9 in (300dpi)

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Seismic P-waves. Cutaway illustration of a section through the Earth, showing seismic waves propagating around the globe. Seismic waves (P-waves and S-waves) are waves of energy that travel through the Earth's layers as a result of an earthquake, explosion or volcano. P-waves (pressure waves or primary waves) are the first to arrive at a seismograph. They travel through the fluid layers of the Earth's interior, and are refracted slightly when they pass through the transition between the semi-solid mantle and the liquid outer core. As a result, there is a P-wave "shadow zone" between approximately 105 and 142 degrees from the earthquake's focus, where the initial P-waves are not registered.

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