نبذة مختصرة : Voir aussi : https://irsn.hal.science/hal-04414348v ; International audience ; The occurrence of extensive liquefaction during the 2020 Petrinja earthquake in the epicentral area raises many questions, notably the geometries of sedimentary bodies in depth. In the fluvial plains of the Kupa, Glina and Sava rivers, many lines of sand ejecta and cracks at the surface are subparallel to the riverbanks in convex meanders and would reveal buried sand point bars below a thick layer of silts. In order to highlight the different structures and estimate their mechanical properties, geotechnical and geophysical investigations were carried out at different sites along the Kupa river in the Petrinja epicentral area. This work presents the approach adopted for both the site selection and the study methods. Then, we show some preliminary results as well as the perspectives of further studies on liquefied layers.
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