• TDEFNODE is a time-dependent version of DEFNODE, allowing for analyzing deformation transients as well as block motions.

    DEFNODE is a Fortran program written by Rob McCaffrey to model elastic lithospheric block rotations and strain rates, and locking or coseismic slip on block-bounding faults. Block motions are specified by spherical Earth angular velocities (Euler rotation poles) and interseismic backslip is applied along faults that separate blocks, using an elastic halfspace. The faults are specified by lon-lat-depth coordinates of nodes (forming an irregular grid of points) along the fault planes. The parameters are estimated by simulated annealing or grid search. Various types of data can be used, including GPS velocities, fault slip rates, earthquake slip vectors, geodetic strain rates, etc.