Liquefaction Assessment

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.