Each iteration within the LOTOS workflow consists of three major
steps: (i) location of the earthquakes in the most up-to-date version
of the model; (ii) calculation of the first derivative matrix; and
(iii) inversion using the LSQR algorithm .
Five iterations were performed for all time periods. Increasing the number
of iterations has a similar effect as decreasing the damping value.
Five iterations provided a compromise between computational cost
and the minimisation of non-linear effects. The values of damping
(smoothing and amplitude regularisation) were selected based on synthetic
tests with realistic data and noise distributions.