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Unformatted text preview: ions
1.1 Graphical repres entation ("beachball plot")
2 Beach Ball Calculator
3 See als o
5 External links Moment tensor solutions  The moment tens or
s olution is ty pic ally
dis play ed graphic ally
us ing a s o- c alledb eac hb all diagram. The pattern of energy radiated during an earthquak e with a s ingle
direc tion of motion on a s ingle fault plane may be modelled as a doub le c ouple, whic h is
des c ribed mathematic ally as a s pec ial c as e of a s ec ond order tens or(s imilar to thos e
fors tres s and s train) k nown as the moment tens or.
Earthquak es not c aus ed by fault movement have quite different patterns of energy radiation.
In the c as e of an underground nuc lear ex plos ion, for ins tanc e, the s eis mic moment tens or
is is otropic and this differenc e allows s uc h ex plos ions to be eas ily dis c riminated from their
en.wikipedia.or g /wiki/Focal_mechanism 1/3 12/8/13 Focal mechanism - Wikipedia, the fr ee encyclopedia s eis mic res pons e.
This is an important
part of monitoring to
dis c riminate between
earthquak es and
ex plos ions for
Tes t Ban...
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- Spring '14