EAS100 Lecture Notes - Lecture 12: Plate Tectonics, Seismic Wave, Asthenosphere

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Eas 100 lecture 12 earthquakes and tectonics on planet earth. We can use refractions, reflections, and speeds of these seismic waves to gain further understanding about the composition of earth"s interior. Seismic body waves may: reflect needs a sharp boundary to turn it in a different direction, refract adjustment in direction depending on the contrast in density. Waves often have an arc-shaped path of motion through the earth, as the interior get"s progressively denser. Remember s-waves cannot make it through the outer and inner core as they cannot pass through liquids, therefore if s-waves make it through the interior of the earth, they must bend around the core. Mohorovicic discontinuity the boundary between the earth"s crust and the mantle where we see a very rapid increase in velocity as we move further down. The study of movement and deformation of earth"s surface and crust: made up of plates of lithosphere, not plates of crust, that float on the asthenosphere below.

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