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Study Guide 2 - MII Study Guide Spring 2009(Not guaranteed...

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MII Study Guide Spring 2009 (Not guaranteed to be completely complete. Use only as directed; if fever, diarrhea, or vomiting occurs, see your doctor. If you stay interested for more than four hours, see your doctor) Seismic Waves Elastic deformation Hooke’s law (stress and strain) Elastic constants: Young’s modulus ( Y ), bulk modulus ( K ), shear modulus ( μ ). Body Waves P waves (Primary, Pressure) Fastest elastic wave – first to arrive. solids, liquids, gasses. Particle motion, velocity v P = K + 4 3 μ ρ S wave (Secondary, Shear) Second to arrive Solids only, particle motion, velocity v S = μ ρ SH and SV. Surface waves Rayleigh waves (like water waves, but retrograde elliptical particle motion) Love waves (SH waves trapped in a low velocity surface layer by total internal refraction). Reflection and Refraction of Seismic Waves. Snell’s Law How angles are measured Relation of angles to velocities in the two layers Mode Conversion Definition of SV and SH waves. P to SV, SV to P (SH does not mode convert) Application of Snell’s law to cases involving mode conversion. Total Internal Reflection. Requires ray-path from a lower velocity to higher velocity medium It is the mechanism by which SH waves are trapped in the crust to form Love Waves.
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Structure of Earth’s interior Layering by composition into crust, mantle, and core Crust
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