28 - Velocity of a S-wave = Square Root of (mu/p) Second...

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01:06 2 Types of Seismic Waves DIAGRAM 1 and 2 1.  Body Wave Two Types 1. P wave : (primary or pressure wave) fastest seismic waves, always the first one  that you will feel from an earthquake/always first to reach any point Velocity of a P-wave = Square root of ((K + 4/3mu/p)) K= bulk Moldulus, mu= shear modulus, p=density Because elastic modulii (k and mu) are in the numerator, the larger these values  = the stiffer the material   faster waves speed SEE DIAGRAM 3 –sections compress together, like when you shake out a slinky Particle motion in a P-wave is parallel to the ray path P-waves are able to travel at some velocity in water because K isn’t 0 2.  S wave : (secondary or shear wave) 
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Unformatted text preview: Velocity of a S-wave = Square Root of (mu/p) Second type of wave, travels fast, but more slowl than a P wave Rope demonstration-like you shake the rope to see troughs, particle motion is up and down Particle Motion in a shear wave is perpendicular to the ray path SEE DIAGRAM 4 Mu (shear modulus) = 0 for fluids and gases How we know the outer core of Earth is molten Shear waves cause most of the damage in most EQs Can become polarized split into two ways: 1) S v (vertically polarized shear waves) and 2) S h (horizontally polarized shear waves) Half energy moves up and down, and half moves side to side 01:06 01:06...
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This note was uploaded on 10/19/2010 for the course GEOL 240 at USC.

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28 - Velocity of a S-wave = Square Root of (mu/p) Second...

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