  Omori Law describes the evolution of the aftershocks of a strong earthquake.
Established at the end of the century before last, it is characterized by the
beauty of its form, quite definite clarity, as a result of which it still
attracts considerable attention of the geophysical community. In recent years,
we have accumulated considerable experience in studying the Omori law by
theoretical and experimental methods. This paper summarizes the results of our
study briefly. The main attention is focused on the phenomenological theory of
aftershocks, the foundations of which were laid by Fusakichi Omori. Keywords:
earthquake, source deactivation, logistic equation, nonlinear diffusion
equation, Omori epoch, round-the-world echo, mirror triad.
