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Previous: Draft On the relationship
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.