A comparison between short term (Co‐Seismic) and long term (one year) slip for the Landers Earthquake: Measurements from strong motion and SAR interferometry

The long term relative displacements in the region of the Landers earthquake were measured over a time interval of about one year using SAR interferometry. We have also evaluated the co-seismic slip distribution through a strong motion inversion [Cotton and Campillo, 1995] and these results are used to compute the static displacement field associated with the co-seismic slip. We show that the synthetic static and the interferometry measurements are in very good agreement. To give an evaluation of the magnitude of the pre- and post-seismic slip, a residual interferogram between data and synthetic co-seismic slip has been computed. A simple analysis of the residual displacements gives a limiting value of the amplitude of pre- and post-seismic slip integrated over a period of one year and suggests that it is on the order of a few decimeters.