GEOL 1101 Lecture Notes - Lecture 8: Hypocenter, Richter Magnitude Scale
3 Nov 2016
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Document Summary
Earthquake an episode of ground shaking, a consequence of lithosphere-plate movements, punctuate each step in the growth of mountains, the drift of continents, and the opening and closing of ocean basins. A fact of life on human earth, almost 1 million happen every year. Shear waves same but perpendicular to wave. P (primary waves) compressional body waves. S (secondary) waves shear body waves. R (rayleigh) waves surface waves that cause the ground to ripple up and down. L (love) waves surface waves that cause the ground to ripple back and forth, creating a snakelike movement. Magnitude number that indicates its relative size as determined by measuring the maximum amplitude of ground motion recorded by a seismograph. Amplitude of ground motion up and down or sideways motions of the ground. Focus the location where a fault slops during an earthquake (hypocenter) Epicenter the point on the surface of the earth directly above the focus of an earthquake.
