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Refraction—animation 1 of 7 (educational)

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Uploaded on Dec 28, 2009

1st in Refraction Series from: www.iris.edu/hq/programs/education_and_outreach/animations
Introduction to refraction. Seismic waves follow the same law of refraction at compositional boundaries. If the seismic wave velocity in the rock below a boundary increases,the waves will be refracted upward and speed up relative to their original path. If it passes across a boundary to a lower velocity layer, the wave will be refracted downward and slow down. Because velocity generally increases with depth in the mantle, the wave paths get bent until they reach a critical angle at which point, the waves return to the surface following a curved path upward.

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