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We use 25 records of the August 13, 2006 earthquake Mw 5.3 to simulate strong ground motions for what could be an eventual earthquake of Mw 7.3 which may be expected in the border region broken by 1973 earthquake and the small gap remainder from Tecoman earthquake. In this study we integrate the advantages of three methodologies to estimate the possible peak ground accelerations, acceleration waveforms and response spectra for an eventual earthquake. We use ground motions predictive equations adequate for the region to compare our estimation of synthetic PGAs. The acceleration waveforms were used to estimate the response spectra and we found that in 1 out of 25 stations, the maximum spectral amplitude reach values that exceed the design spectrum indicated in the new version of the Manual of Civil Structures published in 2008, a model design code in Mexico.