Table 2 Orientation of principal stresses and stress ratio in the study area. The location of grid is shown in Fig. 11(b). Azimuth is measured clockwise from the north in degrees. Dip is measured downward from the horizontal surface in degrees. Stress ratio is defined by R = (σ₁ − σ₂)/(σ₁ − σ₃). The values in the brackets indicate the range of uncertainty.

(0, 0)

−75

[−83, +64]

2

[−18, +14]

21

[−157, +201]

71

[+45, +90]

−166

[−172, −154]

19

[−37, +44]

0.77

[0.5, 1.0]

(0, 1)

−77

[−82, −63]

2

[−24, +10]

− 170

[−350, +10]

65

[−25, +90]

14

[−165, +194]

25

[−65, +89]

0.96

[0.6, 1.0]

(0, 2)

−75

[−91, −54]

12

[−21, +19]

− 169

[−319, −127]

19

[−64, +84]

45

[−90, −205]

68

[−19, +90]

0.72

[0.4, 1.0]

(1, 1)

103

[+93, +115]

12

[−12, +33]

−24

[−95, +65]

70

[+54, +88]

−164

[−174, −150]

15

[−5, +44]

0.49

[0.1, 0.8]

(2, 1)

108

[+99, +120]

14

[−19, +43]

−48

[−227, +131]

75

[+46, +90]

−160

[−172,−150]

6

[−15, +44]

0.43

[0.0, 0.7]