A.A. Konovalova1, 2, V.A. Saltykov1, 2

1Kamchatka Vitus Bering State University, 683032, Petropavlovsk-Kamchatsky, Pogranichnaya Street, 4
2Kamchatka Branch of Geophysical Survey of the Russian Academy of Sciences, 683006, Petropavlovsk-Kamchatsky, Piip blvd., 9;
e-mail: KonovalovAnna@mail.ru

In work necessity of aftershock sequences removal from the catalogue of earthquakes at estimation of the recurrence graph slope g-value is justified. Calculations were made at several thresholds of minimal number of used earthquakes N = 100, 50 and 25 for all earthquakes from the catalogue (gall), for the grouped earthquakes (namely, aftershocks) - gaft and for background events (gbckgr) in the spatial area of aftershock sequences. Z-parameter (normalized difference) and Kolmogorov-Smirnov's criterion were used for comparison of the received gaft-value with gbckgr-value (gall with gbckgr and gall with gaft) and for check of a H0-hypothesis about equality of these values. Z-distribution analysis shows statistically significant distinction of considered values. The received significance levels prove necessity of aftershock sequences removal from the catalogue of earthquakes at calculation of g-value as parameter of seismicity.