Purpose <p>Reinforced Soil Walls have become vital components in modern infrastructure due to their adaptability, cost effectiveness, and structural efficiency in supporting embankments and transportation corridors. However, traditional pseudo static analyses inadequately represent the complex dynamic behaviour of reinforced soil systems, particularly under strong ground motions, where the interaction between backfill soil, reinforcement, and facing governs overall wall performance. The current research experimentally investigates the seismic response of Modular Block Faced Reinforced Soil Walls incorporating recycled elastomeric inclusions as a sustainable vibration mitigation measure. </p> Methods <p>A comprehensive series of 1-g shake table experiments was conducted using both idealized harmonic and scaled earthquake motions with Ethylene Propylene Diene Monomer (EPDM) rubber chip layers embedded within the backfill at thicknesses ranging from 0.05 to 0.15 times the height of the wall (H_w). </p> Results <p>Experimental outcomes indicate that an intermediate inclusion thickness of almost 0.1 H yields the most favourable dynamic response, dropping the acceleration amplification by 18% and crest displacement by nearly 24.8% compared with the unmodified system. The observed nonlinear relationship between inclusion thickness and energy dissipation highlights a threshold effect, beyond which additional thickness offers diminishing stability benefits. </p> Conclusion <p>The recycled EPDM rubber chip layers significantly enhance seismic resilience and sustainability in geotechnical engineering. This approach aligns with circular economy principles and supports the United Nations Sustainable Development Goals through innovation driven, resource conscious engineering. Also, outcomes contribute to the development of empirical models and design guidelines for damping optimized Reinforced Soil Retaining Walls suitable for seismic prone regions.</p>