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www.iris.edu/hq... A stone causes ripples to radiate out across the surface of a pond in all directions. Such imagery is the analog or familiar situation for a classic seismology instructional analogy "Seismic waves radiate outward from an earthquake's epicenter like ripples on water." Video Credit: Larry Braile, Purdue University
For a full discussion of this analogy see www.iris.edu/hq...