Published online by Cambridge University Press: 30 January 2018
In this paper we discuss the decay properties of Markov branching processes with disasters, including the decay parameter, invariant measures, and quasistationary distributions. After showing that the corresponding q-matrix Q is always regular and, thus, that the Feller minimal Q-process is honest, we obtain the exact value of the decay parameter λC . We show that the decay parameter can be easily expressed explicitly. We further show that the Markov branching process with disaster is always λC -positive. The invariant vectors, the invariant measures, and the quasidistributions are given explicitly.