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Abstract:

A nonzero isotropic moment of a seismic source does not by itself indicate a change of volume, nor does its absence indicate a constant volume. Any isotropic moment may be associated with any positive or negative volume change. A relationship between the isotropic moment and the volume change can only be established when the geometric boundary of the source is precisely defined. A definite and general relationship exists however between the isotropic moment and the volume displaced through any spherical surface enclosing the source.



Erhard Wielandt
2003-05-30