lecture_8 - D e t e r m i n i n g E a r t h s I n t e r i o...

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Unformatted text preview: D e t e r m i n i n g E a r t h s I n t e r i o r S t r u c t u r e Seismic (Body) Waves P waves Compressional or longitudinal (analogous to sound waves in air), can travel through fluid, solid and gaseous materials. P means primary, because they travel faster and arrive sooner. S waves Shear or transverse (analogous to waves on a taut rope), can only travel through solid materials. S means secondary, because they travel less quickly. When a wave hits an interface between two materials of different densities, it can be reflected and/or refracted (bent). Gradual and continuous density changes cause gradual and continuous refraction. geophysics.ou.edu/solid- earth Lattimer, AST 248, Lecture 8 p.1/14 P- a n d S- W a v e P r o p a g a t i o n geophysics.ou.edu/solid- earth P-wave shadow zone 104 140 solid liquid Lattimer, AST 248, Lecture 8 p.2/14 P l a t e T e c t o n i c s Earths crust is divided into plates. Plates move because they float on the semi-liquid asthenosphere, a region 100250 km below the surface at the top of the upper mantle. Energy source is heat conduction from interior. USGS, Wikipedia Ritter, Michael E.: The Physical Environment: an Introduction to Physical Geography Lattimer, AST 248, Lecture 8 p.3/14 Lattimer, AST 248, Lecture 8 p.4/14 S. Harris Lattimer, AST 248, Lecture 8 p.5/14 E...
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lecture_8 - D e t e r m i n i n g E a r t h s I n t e r i o...

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