GEOL 1330 Lecture Notes - Lecture 15: Seismic Wave, Epicenter, Outer Core
20 Jul 2016
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Document Summary
Seismology tell us about the density of rocks. Their speed (velocity) generally increases with depth in the earth. When seismic waves travel from one material to another, the path of the waves are refracted or bent. Also, at the interface of the two materials (rock types) some energy is reflected back. Velocity of seismic waves varies with rock properties. First arrival of p-wave at 10 sec & 60 km. Velocity differs base from the density and elasticity. Recording first the crust(1-4), then dipping down into the mantle(5-6). P waves could go through all mediums, but s waves only go through solids, mainly the liquid outer core combined with the fact they don"t go through the liquid. No s-waves recorded in the interior of the earth because something opaque to the liquid. Something opaque to shear waves due to liquid. Heat transfer by hot(less dense) material rising and cold(more dense) material sinkings.
