Il terremoto del 1 settembre 1951 nel maceratese: nuove fonti e revisione macrosismica

Abstract

This work illustrates the process of revising the macroseismic data of the earthquake of September 1, 1951, which occurred in the province of Macerata (Central Italy), and it is quoted in the CPTI15 catalog with Mw 5.2. The historical period, close to the end of the Second World War, and the concomitance of other earthquakes in the same area, have made the research for new data, and in particular the work to discriminate the damage due to the 1951 shock from those due to war or other seismic events, very complex. Thanks to the research carried out mainly in the provincial archives of the affected areas, it was possible to deepen the level of knowledge of the event, bringing from 80 to 255 the number of localities for which macroseismic information are available. After the revision the epicentral area, with Imax 7, is restricted to the western sector of the province of Macerata, close to the Sibillini Mountains. The macroseismic magnitude, Mw 5.2, calculated with the new dataset, does not vary from the previous one.