The article presents new data on magmatic rock composition from the Stolbovaya formation, Kamchatsky Mys Peninsula. The studied rocks belong to high alumina tholeiitic island arc series and their geochemical characteristics are identical to those from Kronotskaya formations in Kronotsky Peninsula. Magmanicsedimentary complexes of the Stolbovskaya formations were deposited within the volcanic archipelago of the Kronotsky volcanic arc. Geochemical and isotopic data from the studied rocks give evidence that they were formed from a depleted mantle source. The certain observed differences in Eocene rock composition from Kamchatsky Mys and Kronotsky peninsulas are likely caused by differences in fluid regime.

The items of information about eruptions activity of Ebeko volcano in 2010-2011 are resulted. In 2010 from eruption funnel of Northern crater there were two weak short-term explosive eruptions. The eruption was phreatic, the cast out products are submitted by resurgent ashes. Volumes of the thrown out material ~ 1.2 t and ~ 95 t accordingly. All eruptions were anticipated by changes in chemical structure of fumarole gases, before eruption of July 2, 2010 the seismic harbingers were observed. In July, 2011 there was a series of hydrothermal explosions on the average crater of a volcano. The morphological changes have bottom and southwest wall of a crater. The maximal range ejection of ashes did not exceed 560 m.