. The results of the study indicate that increasing the earthquake frequency domain causes a decrease in the maximum displacement response of the reservoir wall, which is true for both linear and nonlinear materials, except for the case of nonlinear materials under an earthquake with a maximum acceleration of 0.5 g, in which the earthquake with a medium frequency domain has the lowest displacement of 19.4 cm. With increasing the maximum acceleration of earthquakes, the displacement changes in the linear and nonlinear models are almost constant for all three frequency domains, so that with increasing the maximum acceleration from 0.2 g to 0.35 g and 0.5 g, there is an average increase of 65% and 130% for all three frequency domains. The structural responses under an earthquake with a low frequency domain significantly produce the highest displacement in the reservoir wall, even at low intensities; So that even at an acceleration of 0.2 g and for both linear and nonlinear modes, the materials have a displacement of nearly 16 cm, which indicates the factor of creating large displacements, even at low intensities. Also, by increasing the maximum acceleration to 0.5 g, these values are equal to 36.25 and 45.46 cm in linear and nonlinear behavior, respectively. By comparing the linear and nonlinear behavior of the materials, it can be concluded that in an earthquake with a high frequency domain and an intensity of 0.5 g, the displacement of the wall in the nonlinear mode has increased by about 70% compared to its linear mode, which indicates the importance of the nonlinear behavior of materials in areas with high seismicity and also the importance of the existence of faults with the potential to cause earthquakes with high frequency content.

After the earthquake, the increase in displacements in the wall inear