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We describe and analyze elements of the newly updated physics-based Ground Motion Parameter Maps System of Mexico City. Low uncertainty estimates of earthquake effects in Mexico's capital are needed for long-and short-term periods due to the high level of hazard in the region. Shortly after an earthquake, planners and decision makers require estimates of damage and ground motion to guide reconnaissance and mitigation activities. After the occurrence of an intensely-felt earthquake in the city, the current system delivers estimated losses, deaths, water pipe leaks, and spectral accelerations for different structural periods. The uncertainty associated with the ground motion, which serves as a starting point for the rest of the calculations, is high. We present some examples of the system's performance following the latest Mw7. 2 Puebla-Morelos 2018 earthquake and discuss the drawbacks of the employed …