  This paper has evolved out of our previous work on static stress transfer,
where we used the full-space elastostatic Green's tensor to compute the Coulomb
stress transfer impact of the Landers earthquake on the Hector Mine event. In
this work, we use the elastostatic Green's tensor for an arbitrary layered
Earth model with free-surface boundary conditions to study the impact of
elastic heterogeneity as well as source-fault slip and geometry on the stress
transfer mechanism. Slip distribution and fault geometry of the source have a
significant impact on the stress transfer, especially in case of spatially
extended triggered events. Maximization of the Coulomb stress transfer function
for known aftershocks provides a mechanism for inverting for the source event
slip. Heterogeneity of the elastic earth parameters is shown to have a
sizeable, but lower-magnitude, impact on the static stress transfer in 3D. The
analysis is applied to Landers/Hector Mine and 100 small "aftershocks" of the
Landers event. A computational toolkit is provided for the study of static
stress transfer for arbitrary source and receiver faults in layered Earth.
