EOSC 114 Chapter Notes - Chapter 6: Hypocenter, Epicenter, Seismogram
27 Aug 2017
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What we feel is the shaking due to the waves produced by the earthquake. Elastic rebound: used to define what happens at an earthquake. As the stresses build up, we have deformation taking place. Elastic deformation: regains its original shape after stress is removed (rock breaks) Epicentre: the point of the surface directly above the hypocentre (focus) Two classes of waves: body waves travel inside the body of the earth, surface waves travel along the earth"s surface. P wave (body wave: smallest of the waves, travels fastest, compressed then extends material as the wave moves through them. S wave (body wave: particles move up and down (vertical, particle motion is perpendicular with respect to the direction of propagation, only solids (can"t propagate through liquid, comes after (slower than p-waves) Rayleigh wave (surface wave: largest feature/shaping on the seismogram, travels along the surface (larger amplitude on surface)
