Table 3 3D principal in situ stress measurement.

From: Study of in situ stress inversion of deeply incised valleys considering the river evolution process

No.

Depth(m)

σ1(MPa)

σ2(MPa)

σ3(MPa)

magnitude

α

β

magnitude

α

β

magnitude

α

β

1

549

24.56

349.0°

18.0°

20.37

92.0°

35.0°

10.52

237.0°

49.0°

2

470

28.96

325.0°

27.2°

18.83

72.5°

30.3°

10.88

201.4°

47.0°

3

357

27.29

310.4°

−3.5°

18.27

36.8°

45.6°

8.49

223.8°

44.2°

4

238

19.21

323.0°

−23.5°

13.61

49.2°

8.6°

5.57

300.4°

64.8°

5

173

22.11

332.0°

30.1°

11.63

84.0°

32.9°

5.86

210.1°

42.3°

6

107

15.98

325.6°

30.1°

8.53

81.8

37.3°

3.14

208.5°

38.1°

7

491

32.91

280.6°

0.2°

24.24

190.5°

28.6°

16.41

10.9°

61.4°

  1. Note: Stress magnitude is expressed in MPa (megapascals). The azimuth angle (α) of the σ1 principal stress is defined within the horizontal plane, while its dip angle (β) is measured relative to the horizontal reference. The elevation angle is oriented with the upward vertical direction as the positive reference. .
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