The research presents an analysis of the dynamic behavior of the Alpamarca tailings dam located in Junín, central Peru, because of the catastrophic effects of earthquakes that frequently occur on the western coast of South America. Dam from the 4670 m elevation. Up to the elevation 4703 m. Under the sea level, with the purpose of supplying the demand for tailings generation in the mining area. The tailings dams are important structures due to the storage of contaminant residues that would shave the environment in the event of a collapse or rupture, which is indispensable to carry out studies to characterize their seismic behavior. In this research, probabilistic seismic threat studies were performed using the OpenQuake software, working with the regional seismicity and soil attenuation law of Peru. Dynamic behavior analysis was performed using the FLAC 2D software, based on the finite difference method. The simulation of the seismic behavior of the dam is made by discussing several important aspects that should be considered for a correct analysis such as the selection of the project earthquake, the filtering of high frequencies to minimize the number of elements of the mesh, the introduction of Quiet conditions, the choice of constituent models including the incorporation of hysteretic damping, among other points.