Post by Robert Pyke

This update of my now quite long article on the Limitations of Simplified Methods for Evaluating Earthquake-Induced Liquefaction and its Consequences adds an addendum which addresses the effect of clayey fines and briefly describes two case histories in which correctly addressing the impact of clayey fines was critical. It should be noted that the simplified methods that are referred to in this article are “legacy” methods. Revised methods that use an updated and enlarged database of case histories but still use the framework of the original simplified method, working down from the peak ground acceleration that might be expected in the absence of liquefaction, are now starting to emerge from the Next Generation Liquefaction (NGL) program of studies. The first of these is described in Ulmer et al. (2024). This is a very elegant study but many of the limitations of the original simplified method remain.