EES 150 Lecture Notes - Lecture 9: Epicenter, Hypocenter, Lithosphere
12 Feb 2018
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Document Summary
The focus (hypocenter) is the exact location of the earthquake. The epicenter is the location directly above on the surface. Primary waves are compressional earthquake waves that travel the fastest. In p waves, particles compress and expand as they move back and forth (slinky) In slower secondary waves, particular shear (slide) at right angles to the wave direction (rope) As a s wave moves through, the particles move up and down relative to each other. Earthquakes also generate slow moving surface waves whose effect lessens with depth {ex: raleigh waves} Seismograms are generated by earthquakes, he example shown was generated from north korea nuclear testing. P and s waves can be used to determine an earthquake"s epicenter. At greater distances, the p and s waves arrive further apart. The difference of arrival time between s and p allows calculation of distance to earthquake. If the distance to the earthquake is calculated for three locations, the epicenter can be located.
