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For the source characterization of Mexican subduction earthquakes we used records from the Guerrero Accelerograph Array for earthquakes occurring during the last 15 years with seismic moments ranging from 6.37E+23 to 1.15E+28 dyne cm. After removing the path and site effects, we obtained the flat level from the source acceleration spectra versus seismic moment and compared it with the relationship proposed by . A new alternative method for characterizing size and stress drop of asperities in source modeling is to use the relationship between acceleration source spectral level and seismic moment. We found that the relationship proposed by Dan et al. works appropriately for predicting the flat level of the acceleration spectra for the Mexican subduction earthquakes.

To contrast these results we analyzed the aftershocks of the Tokachi-oki, Japan, earthquake of 26 September 2003 and aftershocks …