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k223d is based on the composite source model technique (Zeng et al. BSSA, 1994) whereby a set of hierarchical circular patches of slip are randomly placed on the fault plane based on a spatial probability density function. Each individual patch of slip has a spatial distribution defined as a circular crack (Ruiz et al., GJI, 2011). At each point on the fault plane the contribution from the patches of slip at that location are summed together leading to the production of a final slip distribution that is self-similar. A further development has been the inclusion of surface rupture in k223d when surface nodes are specified. In this newest version it is now possible to calculate the travel time of the rupture front across the fault plane using a user defined rupture velocity and a nucleation location.