Assessing liquefaction potential using Liquefaction Potential Index (LPI) and ground-response analysis –based on PSHA-based ground motions

Carmina Borja; Richelle Zafra; Perlie Velasco; Marish Madlangbayan

doi:10.52751/cmujs.2025.v1.a3as0y93

Authors

Carmina B. Borja University of the Philippines Los Baños Author https://orcid.org/0009-0003-2990-6041
Dr. Richelle G. Zafra University of the Philippines Los Baños Author
Dr. Perlie P. Velasco University of the Philippines Los Baños Author
Dr. Marish S. Madlangbayan University of the Philippines Los Baños Author

DOI:

https://doi.org/10.52751/cmujs.2025.v1.a3as0y93

Keywords:

Liquefaction potential index, Ground response analysis, Probabilistic seismic hazard analysis

Abstract

Liquefaction potential index (LPI) is an empirical parameter that predicts the surface manifestation of liquefaction. In this study, the result of LPI for two cities (Calamba and Cabuyao) of Laguna was evaluated due to historical liquefaction occurrences attributed to earthquake events and volcanic eruptions. These sites represented liquefiable and a non-liquefiable case. LPI was validated through site-specific ground response analysis (GRA) using a nonlinear soil model and using input motions based on the probabilistic approach. Using SPT data from 22 locations, result of LPI reveals that the borehole sites in Cabuyao City have a low to very high liquefaction potential, while in Calamba City, the sites have a moderate to very high liquefaction potential. The high potential for liquefaction in Calamba was affirmed through ground response analysis. Further verification with empirical data is recommended to determine the applicability and limitations of the procedure.

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