The algorithm CN is applied in Italy using the regionalization based on the seismotectonic model proposed by Peresan et al. (1999), later on expanded to the Adriatic region (Peresan, 2018). The forward prediction is routinely performed every two months, using the catalogue UCI2001 (Peresan et al., 2002), which is updated using the NEIC Preliminary Determinations of Epicenters (Peresan & Rotwain, 1998) since 1986, and complemented by ISC comprehensive catalog since 2009 (Peresan & Romashkova, 2022). The thresholds M₀ for the selection of the Strong Earthquakes are fixed, according to their average return period, to M₀ =5.4 for the Northern and Adriatic regions and to M₀ =5.6 for the Central and Southern regions. Details about CN prospective application in Italy can be found in Peresan et al., (2005).

Experiments in retrospective simulation of prediction have been performed considering the time interval where the catalogue in sufficiently complete for the application of the algorithm CN (that is Jan.1954 - Dec. 1997, for the Central and Southern regions, and Jan . 1964 - Dec. 1997, for the Nothern region). Results of forward predictions are routinely provided since January 1998.

The experiment in intermediate-term middle-range earthquake prediction by CN algoritm application in Italy, is part of a series of prospective testing experiments ongoing on a global scale.

• Other prediction experiments and algorithms