  In part 1 we identified a new coupling between death spikes and birth dips
that occurs following catastrophic events such as influenza pandemics and
earthquakes. Here we seek to characterize some of the key features. We
introduce a transfer function defined as the amplitude of the birth trough (the
output) divided by the amplitude of the death spike (the input). This has two
features: it is always smaller than one so is an attenuation factor and as a
function of the amplitude of the death spike, it may be characterized by a
power law with exponent close to unity. Since many countries do not publish
monthly data, merely annual data, we attempt to extend the analysis to cover
such data and how to identify the death-birth coupling. Finally we compare the
response to unexpected death spikes and regular seasonal death peaks, such as
winter death peaks which occur annually in many countries.
