The article presents the
results of FCAZ-recognition of the strongest (M
≥ 7.75) earthquake-prone areas on the Pacific coast
of the Kamchatka Peninsula and strong (M
≥ 6.5) earthquake-prone areas in California. For
the first time, earthquake epicenters from declustered catalogs
were used as recognition objects. Based on the example of the
considered regions it is shown that the presence of foreshock
and aftershock sequences in the earthquake catalogs does not
significantly affect the results of FCAZ-recognition based on
the clustering study of weak earthquake epicenters.