Resolved Shear and Normal Stress

tau2stress() calculate normal and shear stress components, while tau2tendency() computes the tendency for slip and dilatency for a given set of faults and a given stress tensor.

Usage

tau2shearnorm(tau, fault, friction = 0.6)

tau2tendency(tau, fault, friction = 0.6)

Arguments

tau

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

fault

"Fault" object where the rows are the observations, and the columns the coordinates.

friction

numeric. Coefficient of friction (0.6 by default)

Value

2-column numeric array giving the relative normal and shear stress components for each fault in fault.

See also

slip_inversion()

Other stress-tensor: fault_instability_criterion(), reduced_stress(), stress_shape(), tau2rup(), tau2stress()

Examples

f <- angelier1990$TYM
tau <- reduced_stress(f)
tau2shearnorm(tau, f)
#>             normal     shear
#>  [1,] -0.319049467 1.0074373
#>  [2,] -0.199966082 1.0595722
#>  [3,] -0.683886779 0.5641852
#>  [4,] -0.516062452 0.8527739
#>  [5,] -0.368199436 0.9627699
#>  [6,] -0.703458404 0.3081223
#>  [7,] -0.712066093 0.5942078
#>  [8,] -0.288765979 1.0276038
#>  [9,] -0.194934248 1.0740371
#> [10,] -0.218113823 1.0672641
#> [11,] -0.611589412 0.7495115
#> [12,]  0.103272184 1.1484876
#> [13,]  0.002922413 1.1571691
#> [14,] -0.440070773 0.8983697
#> [15,] -0.311052993 1.0178778
#> [16,] -0.311065410 0.9719439
#> [17,] -0.224411787 1.0421138
#> [18,] -0.345461213 0.9740412
#> [19,] -0.702405649 0.6191082
#> [20,] -0.039455163 1.1427998
#> [21,]  0.189119716 1.1009707
#> [22,]  0.365529916 1.1962668
#> [23,] -0.652338281 0.4231349
#> [24,]  0.405893693 1.1501004
#> [25,] -0.132550302 1.0693392
#> [26,] -0.716263098 0.5471174
#> [27,] -0.368438977 0.9833086
#> [28,] -0.121031192 1.1152451
#> [29,] -0.567179606 0.8080235
#> [30,] -0.115269578 1.0803975
#> [31,] -0.490745306 0.8277931
#> [32,] -0.366994676 0.9677083
#> [33,] -0.419461649 0.8666342
#> [34,]  0.287785173 1.1988409
#> [35,] -0.504018233 0.8705438
#> [36,] -0.506658988 0.7120882
#> [37,] -0.413885186 0.8822828
#> [38,] -0.480009299 0.8488841

tau2tendency(tau, f)
#>       slip_tendency dilatation_tendency
#>  [1,]    -3.1576209           0.7658835
#>  [2,]    -5.2987594           0.7162548
#>  [3,]    -0.8249688           0.9179317
#>  [4,]    -1.6524626           0.8479899
#>  [5,]    -2.6148054           0.7863671
#>  [6,]    -0.4380106           0.9260883
#>  [7,]    -0.8344841           0.9296756
#>  [8,]    -3.5586043           0.7532627
#>  [9,]    -5.5097402           0.7141577
#> [10,]    -4.8931521           0.7238180
#> [11,]    -1.2255142           0.8878014
#> [12,]    11.1209776           0.5898783
#> [13,]   395.9636215           0.6316997
#> [14,]    -2.0414208           0.8163199
#> [15,]    -3.2723613           0.7625509
#> [16,]    -3.1245642           0.7625561
#> [17,]    -4.6437570           0.7264427
#> [18,]    -2.8195385           0.7768908
#> [19,]    -0.8814111           0.9256496
#> [20,]   -28.9645181           0.6493609
#> [21,]     5.8215543           0.5541008
#> [22,]     3.2726920           0.4805808
#> [23,]    -0.6486434           0.9047837
#> [24,]     2.8335014           0.4637589
#> [25,]    -8.0674216           0.6881588
#> [26,]    -0.7638497           0.9314248
#> [27,]    -2.6688506           0.7864669
#> [28,]    -9.2145260           0.6833582
#> [29,]    -1.4246342           0.8692933
#> [30,]    -9.3727894           0.6809570
#> [31,]    -1.6868081           0.8374388
#> [32,]    -2.6368457           0.7858650
#> [33,]    -2.0660629           0.8077309
#> [34,]     4.1657495           0.5129814
#> [35,]    -1.7272070           0.8429704
#> [36,]    -1.4054585           0.8440710
#> [37,]    -2.1317091           0.8054069
#> [38,]    -1.7684743           0.8329645