Fig. 7. Strain rate maps for San Andreas fault system. a) is the second invariant of strain rate derived with gpsgridder using GNSS data only. Black and blue bars represent compressional and extensional principal strain rates respectively, and they are clipped at 100 nanostrain/yr. b) is same as a) but using decomposed InSAR+GNSS horizontal velocity components. c) Differences between a) and b). d) and e) Maximum shear strain rate (defined as\(\max\left({\dot{\varepsilon}}_{1}-{\dot{\varepsilon}}_{2}\right)/2\),Savage et al., 2001) maps with f) being their difference. g) and h) Dilatation rate (defined as\(\left({\dot{\varepsilon}}_{1}+{\dot{\varepsilon}}_{2}\right)\),Savage et al., 2001) with i) being their difference. In all plots, the dashed bounding box denotes the area with Sentinel-1 coverage from two look directions.