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The present study pertains to a catastrophic earthquake with a magnitude of M = 8.1, which occurred in the southern region of Mexico on September 8, 2018. Taking into account the location of the earthquake source and its hypocenter, a numerical simulation of the generation of a seismic source of tsunami waves and their propagation over the water area for two different mechanisms of the seismic source, with their different localizations, was carried out. Two-block and four-block earthquake sources are considered and the obtained wave characteristics are compared with field data and data of other authors.