A correlation of liquefaction phenomena with the surficial geology of point bar deposits; case studies 2021 Damasi, Greece, 2023 Kahramanmaraş, Türkiye and 2010-2011 Christchurch, New Zealand.

After the seismic sequences of 2021 in Damasi (Greece), 2023 in Kahramanmaraş (Türkiye) and 2010-2011 in Christchurch (New Zealand), extensive liquefaction phenomena were induced in the floodplain and point bars of the associated meandering rivers. As the identification of paleoenvironmental features plays a pivotal role in the assessment of the liquefaction susceptibility of an area, this research aims to statistically investigate the spatial distribution of liquefaction phenomena within point bar formations. By combining historical and remote sensing data, reconstruction of the evolution of each meandering fluvial system took place to delineate the different types of lithofacies encountered in point bars. Afterwards, correlation of the density of liquefaction manifestations (ejecta and lateral spreading) with sand- and mud-prone sediments occurred, based on a relationship proposed in this study. The outcome that arose from this procedure resulted in the attribution of weight values for each heterogeneity type, according to which, most of the liquefaction phenomena are correlated with the sandy sediments deposited on the upstream flow direction