#
# prepare the gpsgridder strain map
#
awk '{print $3}' <  ../02_models/gpsgridder/eyy.dat > eyy 
awk '{print $3}' <  ../02_models/gpsgridder/exy.dat > exy 
paste ../02_models/gpsgridder/exx.dat eyy exy > all.dat
awk '{print $1,$2,sqrt($3*$3+$4*$4+2*$5*$5)*1.e9 }' < all.dat > secinv.gmt
xyz2grd secinv.gmt -Gjunk.grd -I2m `grdinfo grad.grd -I1m` -r -diNaN
grdsample junk.grd -I2m -nl+t0.1 `grdinfo grad.grd -I1m` -r -Gmask.grd
surface secinv.gmt -I2m `grdinfo grad.grd -I120c` -T.5 -Ll0. -r -Gsurf.grd -V
grdmath surf.grd mask.grd OR = secinv.grd
grdsample secinv.grd -nb+t.5 `grdinfo grad.grd -I90s` -I30s -r -Ggpsgridder_strain.grd
#
#  clean up
#
rm eyy exy all.dat secinv.gmt secinv.grd  surf.grd mask.grd junk.grd