In the past years the use of reinforced earth technology in retaining wall construction has advanced significantly due to its cost-efficiency, durability, and adaptability to complex geotechnical conditions. These developments highlight the need for accurate models to replicate reinforced earth structures’ behavior under static but also under dynamic conditions, ensuring safety and long-term performance. For conventional structures the seismic design has progressed with advanced methods and safety standards and with the increased seismic activity worldwide, it is essential to assure similar focus to the design methodologies to address dynamic loading effectively reinforced earth structures. This paper reviews the current design methods for reinforced earth support structures under seismic conditions. Additionally, it introduces a new concept for evaluating tensile forces in reinforcements during seismic events, which directly impacts the required reinforcement lengths. The proposed approach builds upon the failure-based calculation method initially developed by Prof. A. Stanciu for static conditions. This method has been extended and adapted to consider seismic forces and introduces a new concept for evaluating tensile forces in reinforcements during seismic events, which directly impacts the required reinforcement lengths.