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of strain release in aftershock sequences. The improvement
may be summarized as follows:
1. Earthquake volume increases with magnitude, instead of being
constant. A relation is given, relating volume to magnitude.
2. A revised energy-magnitude formula is used.
3. The seismic gain ratio, i. e. the ratio between seismic energy and
elastic strain energy, probably increases with magnitude, instead of being
constant. Likewise, the ratio of fault plane area of the main shock to the
vertical section through the aftershock volume increases with magnitude.
4. The seismic energy density, the elastic strain energy density as
well as strain are independent of magnitude.
5. The deformation, i. e. the total strain in the aftershock zone, increases
with magnitude at the same rate as seismic energy and volume do.
As a consequence of these improvements some earlier published strain
release characteristics are reconstructed, this time as deformation characteristics
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