Yu.A. Vinogradov, M.I. Ryzhikova, N.V. Petrova, S.G. Poygina, M.V. Kolomiets
Global earthquakes in the 2021 first half according to the GS RAS  ..............................  7

D.V. Chebrov, S.A. Tikhonov, D.V. Droznin, S.Ya. Droznina, E.A. Matveenko, S.V. Mityushkina,
V.A. Saltykov, S.L. Senyukov, Yu.K. Serafimova, V.A. Sergeev, V.V. Yashchuk
Kamchatka seismic monitoring and Earthquake prediction system and its evolution.
Main results of observations in 2016-2020  ................................................................  28

Yu.F. Kopnichev, I.N. Sokolova
Ring-shaped seismicity structures, being formed in the Alaska region:
Justified prediction of the place and magnitude of the Simeonof earthquake
of July 22, 2020 (Mw=7.8)  ........................................................................................  50

A.I. Lutikov, I.P. Gabsatarova, G.Yu. Dontsova
On the stability of the seismic mode parameters in time by the example
of the east of the central part of Northern Caucasus ...................................................  61

M.Yu. Nesterenko, O.A. Kapustina, S.E. Nikiforov
Influence of development of raw hydrocarbon deposits on the geodynamic state
and seismic regime of the Earth’s crust in the Southern Urals  ...................................  75

P.G. Butyrin
Digital seismic logger “Ermak-5”. Five years of development .....................................  84