DOI: 10.5592/CO/HG.2026.31
Autori: MARIO BAČIĆ , MEHO SAŠA KOVAČEVIĆ , LOVORKA LIBRIĆ , ANTONIA MIRČETA
Sažetak:
This paper examines soil liquefaction as one of the most significant secondary effects of earthquakes, with particular emphasis on the urban area of the City of Zagreb. Given that Zagreb is located in a seismically highly active region, the analysis of the geological and geotechnical characteristics of the soil is directed toward assessing the susceptibility of different parts of the city, with the Sava River plain identified as a potentially most vulnerable zone. Alluvial deposits of the Sava River cover approximately 155 km², accounting for about 24% of the total area of the city, and consist of heterogeneous layers of gravel, sand, and clay. Although liquefaction has traditionally been associated with loose, saturated sands, more recent studies indicate the possibility of liquefaction occurring in gravelly materials as well, which further emphasizes the need for a detailed analysis of these deposits. The paper provides an overview of previous research and efforts aimed at assessing the liquefaction potential of the Sava River plain and highlights the necessity of a systematic and comprehensive approach to the seismic microzonation of this part of Zagreb, in which the assessment of liquefaction potential must represent an integral component. In this context, it is crucial to plan and implement an extensive program of site investigations, together with the establishment of a permanent monitoring network for groundwater level observations in interaction with the aquifer and the Sava River. In the context of accelerated urban development, increased building density, and the construction of infrastructure corridors such as bridges, roads, and underground utilities, a systematic and methodologically grounded assessment of the liquefaction potential of the Sava River plain deposits represents a key step in reducing seismic risk and improving the safety of the urban system of the City of Zagreb.