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Published on Aug 24, 2012
for more animations: www.iris.edu/educate Focal mechanisms are released after an earthquake to show what type of Earth movement produced the earthquake. These are typically shown using a so-called "beachball" diagram. They refer to the orientation of the fault plane that slipped and the slip vector, and are also called fault-plane solutions. Directed by Robert Butler, geophysicist, University of Portland Animation & graphics by Jenda Johnson, Earth Sciences Animated Narration: Roger Groom, Mount Tabor Middle School, Portland OR Dr. Geophysics character: Richard Blakely, geophysicist, U.S.G.S.