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Figure 1: This SAR interferogram of the 1992 Landers earthquake by Massonnet et al. (1993) represents the first use of this method in studying coseismic deformation. The first panel shows the interferogram, and the second panel displays a synthetic interferogram derived from an elastic dislocation model for comparison. Whereas measurements by conventional and space-based geodetic methods, such as GPS, can more accurately determine the displacement vectors for a network of points, SAR interferometry can provide much denser spatial coverage of the displacement field caused by earthquakes. Reprinted with permission from Nature (Massonnet et al., 1993); copyright (1993) Macmillan Magazines Limited---not for further distribution or for sale.

Figure 2: Comparison of continuous GPS and laser strainmeter data from the Pinon Flat Observatory during the time including the 1992 Landers earthquake (from Wyatt et al., 1994). The strainmeter and GPS data are sensitive to different phenomena, and the records do not entirely agree. In particular, the GPS data indicate a somewhat longer period and much larger amplitude postseismic relaxation than do the laser strainmeter data. GPS data are from the Permanent GPS Geodetic Array (Bock et al., 1993). Reprinted with permission, courtesy of the Bulletin of the Seismological Society of America.