Principal Stresses from Stress Tensor

The eigenvector and eigenvalues of a stress tensor give the orientations and relative magnitudes of the principal stress axes.

Usage

sigma2stress(sigma)

Arguments

sigma

symmetric 3x3 matrix. The (reduced) stress tensor.

Value

list with the following components

"sigma_vals"

numeric. The relative magnitudes of the principal stress axes.

"sigma_axes"

The principal stress axes as Line objects.

See also

slip_inversion()

Other stress-tensor: fault_instability_criterion(), reduced_stress(), sigma-comp, sigma2rup(), stress_shape()

Examples

f <- angelier1990$TYM
s <- reduced_stress(f)
sigma2stress(s)
#> $vals
#>     sigma1     sigma2     sigma3 
#>  1.5186760 -0.6378677 -0.8808083 
#> 
#> $axes
#> Line object (n = 3):
#>          azimuth    plunge
#> sigma1 225.71104 84.219427
#> sigma2  62.26628  5.542466
#> sigma3 332.10740  1.636857
#>