Liquefaction Assessment: MSF
Seismic soil liquefaction assessment parameters for the Seed-Idriss simplified procedure and Boulanger-Idriss 2014 update — CRR vs (N1)60cs (SPT) and qc1N (CPT) for clean sand, magnitude scaling factors (MSF) for Mw 5.5–8.5, stress reduction coefficient rd vs depth, Kσ overburden correction, CN normalization, fines content correction delta_N, Ishihara surface manifestation H1/H2 criteria, and factor of safety thresholds.
| assessment method | parameter key | magnitude mw | notes | parameter group | parameter name | unit | value max | value min | value typical |
|---|---|---|---|---|---|---|---|---|---|
| MSF | MSF_Mw5p5 | 5.5 | MSF = 10^2.24 / Mw^2.56 (Idriss & Boulanger 2008/2014); Mw=5.5 MSF varies with (N1)60cs per Boulanger-Idriss 2014 Eq.2.21: MSF_max=1+[(MSF_max-1)*(8.64*exp(-N1_60cs/4.2)-1.325)]; approximate tabulated value at moderate (N1)60cs; adjusts CRR for shorter duration | magnitude_scaling | Magnitude Scaling Factor — Mw=5.5 | dimensionless | 2.5 | 1.89 | 2.2 |
| MSF | MSF_Mw6p0 | 6 | MSF = 10^2.24 / Mw^2.56; Mw=6.0 reference value at (N1)60cs=15 typical; use with CSRfield*(1/MSF) or equivalently CRRMw7.5*MSF | magnitude_scaling | Magnitude Scaling Factor — Mw=6.0 | dimensionless | 1.89 | 1.46 | 1.65 |
| MSF | MSF_Mw6p5 | 6.5 | MSF at Mw=6.5; commonly encountered in moderate seismicity regions | magnitude_scaling | Magnitude Scaling Factor — Mw=6.5 | dimensionless | 1.55 | 1.18 | 1.34 |
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