Based on previous studies and historical earthquakes in the study area, the maximum earthquake occurred in the south of Tehran has a magnitude of 7.6 on the surface wave scale. Using Erdik's relation, this is roughly equal to 7.5 on the torque scale. First, according to the seismicity of the region and the faults around the city of Tehran, the maximum acceptable scenarios (far and near earthquakes) are determined for the pipelines south of Tehran.Then, using Akar and Boomer's reduction relationship, velocity and acceleration graphs and their spectral value (in periods of 0.2 and 1 second) for two magnitudes of torque 5.5. 7.5 are also drawn.Then, following the algorithm of Weatherill et al., the velocity field is also drawn depending on the acceleration.