GNGTS 2019 - Atti del 38° Convegno Nazionale

96 GNGTS 2019 S essione 1.1 provides information about the symmetry of the pdf distribution and the PDFRAD, representing the radius of a sphere having volume equivalent to that recovered by the scatter points (i.e., samples of the pdf distribution). The formula is: where N est is the number of used estimators and w i are the weights that could be eventually associated with each of them . We show the application of our criterion to two cases study. First of all, we used the 32,773 crustal earthquakes of the 2016-2017 Central Italy seismic sequence (Chiaraluce et al. , 2017), located by means the NonLinloc code (Lomax et al. , 2000), based on a global approach. The sequence was recorded by Italian National Seismic Network (Rete Sismica Nazionale, RSN) and 100 stations, in an 100x100 km 2 area around the first mainshock, were used for the relocation. Then, we used a 3-year long subset (2013-2015) of the Italian Seismicity Catalog available in the database ISIDe (ISIDe Working Group, 2016; see Data and Resources), composed by 68,151 earthquakes located by mean of IpoP code, based on a linearized approach. In this case, we used crustal and lithospheric earthquakes (down to 600 km) occurred on the whole Italy Fig. 1 - Correlation matrix for different uncertainty estimators.