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The study presents results from a seismic survey following the September 2023 quick-clay landslide near Stenungsund, Sweden. Quick clays are common in all Nordic countries and are characterized by extremely low shear strength, making them prone to liquefaction and landslides. To investigate the conditions that led to the incident, three dense seismic profiles were acquired in the area, using a sledgehammer source and vertical geophones. Data processing, despite high noise from ongoing construction, revealed first arrivals and clear S-wave reflections. Two main horizons were identified: a shallow coarse-grained sediment layer and a deeper, irregular bedrock surface, showing that the steep bedrock geometry may have contributed to the landslide. The results demonstrate the usefulness of seismic methods in quick-clay environments and will support further analysis of the incident.