If a p-wave is traveling through the earth and encounters molten magma and the velocity of the p-wave will decrease.
What is a p-wave that encounters molten magma?
As a P-wave travels across the Earth and encounters a pool of molten magma, what happens to its velocity? It decreases. If an S-wave travels through rock and hits a pool of molten magma, what happens to the speed of the S-wave? It doesn't travel through magma. Melting regions within the Earth slow down P-waves and stop S-waves because shear motion cannot be transmitted through liquids. Partially melted regions can slow P waves and weaken or weaken S waves.
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