Liquefaction Assessment: KSIGMA
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 | n1 60cs | parameter group | parameter name | value typical |
|---|---|---|---|---|---|---|
| KSIGMA | Ksigma_100kPa | 100 | dimensionless | overburden_correction | Kσ overburden correction — σv0=100 kPa | 1 |
| KSIGMA | Ksigma_200kPa | 200 | dimensionless | overburden_correction | Kσ overburden correction — σv0=200 kPa | 0.883 |
| KSIGMA | Ksigma_300kPa | 300 | dimensionless | overburden_correction | Kσ overburden correction — σv0=300 kPa | 0.815 |
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