If we apply a course fault model to determine the fault plane and rupture velocity for Northridge we find that the south dipping plane is correctly identified, however for this dip-slip event the separation of the two planes in terms of variance reduction is not as great as for Landers.  The more intensive planar calculation takes 15 minutes following the determination of the seismic moment tensor to find the fault plane, slip dimension and rupture velocity.  An additional 17 minutes is needed for the high resolution run.

It is noted that after the preliminary line or course plane runs to determine fault plane and rupture velocity we have the necessary information to apply an attenuation relationship that incorporates directivity affects (Somerville et al. 1997) to generate a preliminary shakemap.