GNGTS 2024 - Atti del 42° Convegno Nazionale

Session 1.1 GNGTS 2024 based on the 3D P-wave and S-wave velocity models. The mean values of the standard errors relatve to the hypocentral coordinates are 0.07 km for the x- and y-coordinates and 0.23 km for the depth. Four events with a magnitude of more than 3.7 occurred in the tme interval investgated: M D =3.8 on January 19, 2018; M D =3.9 on August 11, 2018; M D =4.0 on June 14, 2019; and M D =3.8 on September 22, 2019 (labelled E1, E2, E3, and E4 in Fig. 1). Fig. 1 –Simplifed tectonic and geological sketch of the study area. The small black square indicates the central cell of the grid, where the most strongly radiated seismic energy is concentrated and the Shannon entropy was calculated. Light green diamonds: background seismicity from 2015 to March 2020. Magnitude values are given in coda duraton magnitude MD. Fuchsia-coloured diamonds: earthquakes of the January 19 2018 MD 3.8 (E1) sequence. Blue diamonds: earthquakes of the sequence of August 11, 2018 MD 3.9 (E2). Green diamonds: earthquakes of the sequence of June 14, 2019 MD 4.0 (E3). Red diamonds: earthquakes of the sequence of September 22, 2019 MD 3.8 (E4). The blue line indicates the trace of the secton along which the PCA analysis of Fig. 3 is performed.