the arrows represent stress axes that form a stress ellipsoid with the maximum compressive axis (sigma 1) indicative of horizontal tectonic shortening characteristic of regions of crustal shortening and mountain building associated with thrusts.

the arrows represent strain axes that form a strain ellipsoid with the maximum extension axis (sigma 1) indicative of horizontal tectonic extension characteristic of regions of crustal thinning and rifting.

the arrows represent stress axes that form a stress ellipsoid with the minimum compressive axis (sigma 1) indicative of horizontal tectonic extension characteristic of regions of crustal thinning and rifting.

the arrows represent strain axes that form a strain ellipsoid with the maximum shortening axis (sigma 1) indicative of horizontal tectonic shortening characteristic of regions of crustal shortening and mountain building associated with thrusts

the arrows represent stress axes with the maximum compressive axis (sigma 3) indicative of vertical tectonic shortening characteristic of regions of crustal shortening and mountain building associated with thrusts.