The initial processing used the CUS model to obtain the mechanism. The observed group velocities for all broadband stations used were significantly lower than those predicted using the CUS model. The following link discusses the revised model.
The following link used the modified Yellowstone model to search for the surface-wave spectral amplitude focal mechanism estimate and also compares the observed and predicted waveforms. The source depth, moment magnitude and the focal mechanism are essentially the same as those estimated using the CUS model.