Published: Građevinar 77 (2025) 11
Paper type: Original scientific paper
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Liquefaction in Croatia: Risk assessment and rapid post-earthquake decision-making – five years later

After the 2020 Petrinja earthquake, the area of Sisak-Moslavina County became the focus of intensive scientific research and professional activities related to liquefaction. This paper provides an overview of the documentation and quantification of liquefaction occurrences over a five-year period, including field observations, the development of preliminary susceptibility maps, and the application of various in-situ and laboratory methods to assess soil resistance. Particular emphasis is placed on the use of different geotechnical investigation methods to evaluate cyclic soil resistance and identify areas with increased liquefaction risk, which enabled rapid decision-making in post-earthquake recovery and infrastructure rehabilitation. The study highlights the importance of combining preliminary assessments with detailed geotechnical investigations to support post-earthquake reconstruction. Additionally, recommendations are provided for future activities, including detailed liquefaction microzonation for Sisak-Moslavina County, the definition of guidelines for future investigation work within specific projects, especially those related to linear infrastructure, where soil variability is highly pronounced, and the integration of investigated locations into international databases to contribute to the global calibration of liquefaction assessment charts.

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