Table 1 List of parameters
Notation | Definition | Assignment/derivation for this study |
|---|---|---|
Sign of stress | Â | Positive for compression |
ψ | Dip azimuth (clockwise from north) |  |
α | Angle between SH (slip) direction and dip azimuth | α = ψ -(− 55°) |
δ | Dip angle (positive downward) |  |
σ 1 | Maximum compressional principal stress | σ1 = SH |
σ 2 | Intermediate principal stress | σ2 = Sh |
σ 3 | Minimum principal stress | σ3 = Sv |
S H | Maximum (compressional) horizontal principal stress | SH = rSv = 1.2Sv |
S h | Minimum horizontal principal stress | Sh = Sv |
S v | Vertical stress (overburden) | Calculated from 3D density |
P p | Pore fluid pressure | Pp = λSv = 0.7Sv |
P hyd | Hydrostatic pore fluid pressure | Phyd = 0.6Sv |
σ H | Effective maximum horizontal stress | σH = SH - Pp |
σ h | Effective minimum horizontal stress | σh = Sh - Pp |
σ v | Effective vertical stress | σv = Sv-Pp |
Σ | Stress tensor |  |
r | SH/Sv | r = 1.2 |
λ | Pp/Sv | λ = 0.7, 0.94 |
λ* | (Pp - Phyd) / (Sv – Phyd) | λ* = 0.2, 0.85 |
σ n | Normal stress |  |
σ n_e | Effective normal stress | σn_e = σn - Pp(Eq. (7)) |
Ï„ | Shear stress | Eq. (8) |
Ts | Slip tendency | Ts = τ/σn_e, (Eq. (9)) |
μ | Intrinsic friction coefficient | μ = 0.6 |
SL | Slip likelihood | SL = Ts/μ |
V p | P-wave velocity | Â |