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Unformatted text preview: Elastic rebound theory: Seismic waves are the energy released as rocks snap back to their preferred shape after a break occurs Seismic waves carry energy away from the break-Primary waves have push-pull motion and move the highest velocity-Secondary waves have side-to-side motion and move slower than primary waves-Surface waves can have side to side (Love waves) or up and down (Rayleigh waves) motion The epicenter is the point on the ground surface directly above the focus The focus is the location on the fault where the break occurred Seismographs register the arrival time of seismic waves-Inertia holds mass at a fixed position while the recorder moves relative to it-Records horizontal and vertical motion Primary waves travel faster than Secondary waves so they arrive at the seismograph first The earthquakes location can be determined by plotting distances from three different seismographs The distance and magnitude of an earthquake can be determined from the seismogram...
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- Fall '08
- north american plate, Pacific Plate, Seismic Waves, San Andreas, Primary Waves