It demonstrates that most of the rapid deformation occurs off the San Andreas fault, in the regions of past large earthquakes. The only high strain concentration on the San Andreas is along the Parkfield-Carrizo Plain section. We also compared station velocities before and after the Landers earthquake to determine whether the deformation rates have changed since that earthquake. The two post-Landers solutions give virtually the same result. The results are shown in Figure 3 .
Discrepancies are less for sites located further to the west.
Such pattern is consistent with the sense of the Landers post-seismic deformation. Therefore, this preliminary result seems to confirm significant change of deformation rates after the Landers earthquake, although the pre-Landers station velocities might suffer from systematic errors related to the global reference frame due to relatively sparse coverage of global sites. Reference Shen, Z.-k. D.D. Jackson, B. Ge, Crustal deformation across and beyond Los Angeles basin from geodetic measurements, JGR, Vol. 1996 Publications resulting from this funding Jackson, D.D., Z.-k.