SPT-based probabilistic and deterministic assessment of seismic soil liquefaction triggering hazard

This study serves as an update to the Cetin et al. (2000, 2004) [1,2] databases and presents new liquefaction triggering curves. Compared with these studies from over a decade ago, the resulting new Standard Penetration Test (SPT)-based triggering curves have shifted to slightly higher CSR-levels for a given N1,60,CS for values of N1,60,CS greater than 15 blows/ft, but the correlation curves remain essentially unchanged at N1,60,CS values less than 15 blows/ft. This paper addresses the improved database and the methodologies used for the development of the updated triggering relationships. A companion paper addresses the principal issues that cause differences among three widely used SPT-based liquefaction triggering relationships. •Addresses the improved database and the methodologies used for the updated triggering relationships.•Discusses updates to Cetin et al. [2,4] databases.•New SPT-based triggering curves shifted to slightly higher CSR-levels for values of N1,60,CS greater than 15 blows/ft.•The correlation curves essentially unchanged at N1,60,CS values less than 15 blows/ft.•The companion paper addresses the differences among three liquefaction triggering relationships.