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Abstract:
In the historical catalog published by the SSN, discrepancies have been detected in the depths and magnitudes of ancient earthquakes with epicenters in Mexico City and the State of Mexico; in most cases, due to wrong velocity models used to calculate the hypocenter of these earthquakes (mainly those recorded before 2010). Recently, structure models have been estimated for some areas of Mexico City, which has allowed for a more reliable depth calculation. Regarding the magnitudes, several earthquakes were reported with a few readings, allowing for a misdetermination of magnitude value. In this research, we made a careful relocation of these events, and the magnitude previously calculated was also corroborated with the determination of the seismic moment magnitude; additionally, for the events meeting requirements such as being of magnitudes greater than 2.5 and recorded in more than five stations, we obtained focal mechanisms through several techniques such as Focmec, Fpfit, and Hash, all of them inside the Seisan package. In addition, the inversion was performed using the ISOLA method, which occurred between 2010-2021.
