Elastic Forward Fault Model

Computes surface deformations for a point source or finite source using Okada's method (Okada, Yoshimitsu, Surface Deformation Due To Shear and Tensile Faults in a Half-Space, 1985, BSSA, vol 75, no. 4, pp 1135-1154). Model can take multiple fault inputs and will sum the components to give the total displacements, and strains.