Table 2: 'b value' at different depth layers in the Shillong Plateau.

Depth (D) range (km)

a value

b value Maximum likelihood

b value least square fit

Standard error (δb)

0 < D ≤ 10

3.58

0.78

0.73

0.02

10 < D ≤ 20

4.12

0.83

0.86

0.01

20 < D ≤ 30

3.71

0.74

0.78

0.01

30 < D ≤ 40

3.26

0.66

0.69

0.02

40 < D ≤ 50

3.01

0.71

0.70

0.02

0 < D ≤ 50

4.31

0.77

0.81

0.01