With the increasing deployment of wind energy projects in seismic regions, standards such as DNV-RP-0585-2021 (International) and NCh2369-2023 (Chile), influenced by IEC 61400-1 (2019) and IEC 61400-6 (2020), address the unique scenario where seismic and wind loads are comparable. Despite the growing size and height of wind turbines, most design codes still assume structural damping values of 1% for parked turbines and 5% for operational turbines, based on limited studies such as those by Prowell et al. [5] and Ishihara [6]. However, modern turbines often exceed 4 MW and 120 m hub heights, underscoring the need to recalibrate damping parameters for structural and seismic design, as well as for model calibration in digital twin applications. This study primarily assesses the damping ratio of parked and operational conditions for two full-scale onshore wind turbines in Chile and Argentina, with hub heights of 140 m and 87.6 m, respectively. New correlations for damping ratios are proposed, distinguishing between fore-aft and side-to-side directions. These findings refine the design values in IEC 61400-6 (Annex P) and highlight the aerodynamic contribution to increased damping in the fore-aft direction of wind turbines.