Function to calculate Omori's law at time t for an event
that happened at time ti
Arguments
- theta
ETAS parameters
(list(mu = mu, K = K, alpha = alpha, c = c, p = p), only parameters c
and p are used
- t
Time at which Omori's law is evaluated
- ti
Time of the event in the history
Value
Value of Omori's law at point t for an event that happened at ti