The earthquake of July 28, 1799, whose worse effects occurred in the hinterland of the province of Macerata, is one of the main events of the Umbria-Marches region. It is located in a seismogenic zone of transition between the distensive tectonic regime of the Apennines belt and the eastward compressive regime of the Adriatic coast, which makes it a key event for the understanding of this complex area. The distribution of the effects of the 1799 earthquake was reconstructed by several consecutive studies developed by different agencies with different research plans and variable levels of analysis. A careful reading of all these studies shows that the newer ones built up their intensity maps with values partly assessed from raw historical data and partly derived from previous studies...