29 - waves then short closely spaced waves piles up energy...

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October 12, 2010 Three Big Faults in the Bay Area: San Andreas, Hayward, Calveras Directivity Pulses = the big pulse of energy is primary shear wave energy Because the shear wave velocity is only slightly slower than the rupture  velocity * Doppler Shift—if the energy source is moving or not Ex: If a train goes by, the sound goes down as it goes past you High pitch-high frequency, short wave length (Loud) As train passes, shifts to lower frequencies as it goes away from you  The energy source (the noise) is moving relative to us Every split second it is moving it is omitting a sound wave Sound source is moving, almost as fast as the waves are moving (big long period 
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Unformatted text preview: waves then short, closely spaced waves) piles up energy at the front, shear wave energy In any given Earthquake, when a shear wave passes by, the ground will go horizontally and vertically everywhere Kobe, Japan-site in 1995 of a very large, damaging EQ –magnitude 6.9 Killed over 5000 people Ground motions were really strong 2. Surface Waves Two Types: travel around the Earth on the surface, and don’t penetrate down into the body of the Earth 1. Rayleigh Waves Water wave – SEE DIAGRAM 5 Motion like you’re surfing- Prograde Ellipse 2. Love Waves Waves trapped in the shallow Earth’s crust by total internal reflection 01:06 01:06 01:06...
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