  We consider stochastic growth models to represent population dynamics subject
to geometric catastrophes. We analyze different dispersion schemes after
catastrophes, to study how these schemes impact the population viability and
comparing them with the scheme where there is no dispersion. In the schemes
with dispersion, we consider that each colony, after the catastrophe event, has
$d$ new positions to place its survivors. We find out that when $d = 2$ no type
of dispersion considered improves the chance of survival, at best it matches
the scheme where there is no dispersion. When $d = 3$, based on the survival
probability, we conclude that dispersion may be an advantage or not, depending
on its type, the rate of colony growth and the probability that an individual
will survive when exposed to a catastrophe.
