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Focal Mechanisms Explained: What are those “beach balls”? (Educational)

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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
Graphics & Animation: Jenda Johnson
Narration: Roger Groom, Mount Tabor Middle School, Portland OR
Dr. Geophysics character: Richard Blakely, geophysicist, U.S.G.S.

Music: "Constellation" by Water Strider (http://www.waterstridermusic.com)
"Diagonal Stride" by Fadin' by 9 (http://www.fadinby9.com)
written & fiddled by Seth Moran, seismologist U.S.G.S.

Reviewed by Anna Courtier, James Madison University, Harrisonburg VA
For more Earth-science animations, visit www.iris.edu/educate

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