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.