<p>With the increasing development of infrastructure in high-altitude seismically active regions, moraine soil has emerged as one of the most significant engineering materials. Previous studies have extensively investigated the dynamic response of conventional soils under combined rainfall-earthquake conditions. However, research on moraine soils is relatively limited, owing to their distinctive engineering properties and little application history as a relatively new geomaterial. Given the significant structural and gradational differences between moraine soils and conventional soils, the applicability of dynamic response derived from conventional soils to moraine soil remains uncertain. Therefore, this study conducted a series of shaking table tests to systematically investigate the dynamic behavior of moraine soil under seismic loading, rainfall and their combined effects. The results indicate that under combined rainfall and seismic loading, the settlement of moraine soil exceeds the sum of the settlements caused by either action alone. Quantitative analysis reveals that this combined effect has a significant interaction, exacerbating the damage to moraine soil rather than merely being additive. Furthermore, moraine soil exhibits a high sensitivity to rainfall, particularly under extreme conditions, where rainfall-induced settlement can be more than one hundred times greater than that resulting from seismic loading. Consequently, for moraine soils that may experience extreme rainfall and high seismic intensity, foundation treatment methods typically employed for conventional soils can be adapted, alongside enhanced drainage systems.</p>