V.A. Shirokov1, I.I. Stepanov2, I.K. Dubrovskaya3

1The Kamchatkan Branch of the Geophysical Service of the Russian Academy of Science
2Aleksandrovskaya experimental and methodological expedition
3The Institute of Volcanology and Seismology Far-East Branch of the Russian Academy of Sciences

This is the first paper presenting the case study for the active Koryaksky and Klyuchevskoy Volcanoes that shows the temporal relationship between the volcanic earthquakes (the volcanic EQ) and strong tectonic earthquakes (the tectonic EQ) in the world with Мw ≥ 6.3 at the final stage (less than a week) of their preparation (regardless the epicenters and depths of the tectonic EQ). The article shows that in 2009 the volcanic EQ at Koryaksky Volcano occurred 3 days prior to the tectonic EQ in the world and their number was in general anomalously high. 12 of 18 volcanic EQ alerted about the strong world events 3 days prior to the tectonic EQ. In 2008-2009 such effects typical for Klyuchevskoy Volcano as well, were used along with the other forecasting anomalies (including the deformation monitoring) for real-time forecast of the strong tectonic EQ in the world with the delay time equal to 6 days.

Keywords: a pattern of preparing of earthquakes, a precursor, a volcano, forecast for earthquakes.