We report new electron microscopy and high-precision EMP data on tephra from five modern (2009-2011)
eruptions from Kamchatka and Kurile Islands volcanoes. All the studied tephra contain fresh volcanic glass.
Fresh magmatic material prevails in Kliuchevskoi and Sarychev Peak tephra as well as in tephra erupted from
Kizimen volcano in January 2011. Tephra from the initial eruptions of Kizimen volcano (December 2011)
and from Shiveluch and Koriaksky eruptions mainly consist of crystallized rock fragments and crystals
with subordinate amount of glass. Most of the analyzed volcanic glass shards have normal alkalinity and
moderate-K composition as the majority of Kamchatkan magmas. Composition of glasses from the 2010
eruptions of Kliuchevskoi and Shiveluch are consistent with the expected ones for the current period of
their evolution. Composition of volcanic glass from the 2010-2011 eruptions from Kizimen is identical to
that from its largest pre-historic eruptions. This fact implies that a magmatic chamber of stable rhyolitic
composition has been present under Kizimen volcano for at least 10 kyr.

В сборнике содержатся материалы, представленные в виде устных докладов на ХI региональной молодежной научной конференции «Природная среда Камчатки», проходившей в рамках Недели студенческой науки 16 апреля 2012 г. в Институте вулканологии и сейсмологии ДВО РАН
(г. Петропавловск-Камчатский). В сборник включены материалы докладов, прошедших предварительный отбор.

The article describes technology development, structure and content of an information system “Volcanoes of the Kurile-Kamchatka island arc” which will allow integration of wide range of volcanological data on volcanoes in Kamchatka, Kurile Islands and adjacent seas into a single information environment available for Internet users.

We provide data concerning a weak phreatic eruption of Ekarma Volcano on Ekarma Island, in the Kurils, in June 2010. The ash plumes did not rise higher than 3 km above sea level. A preliminary estimate of the volume of erupted resurgent material (mostly tephra) is on order 2 х 10^5 м^3. Reconstruction of the volcano's history and the dynamics of its eruptive activity for the last 4500-5000 years suggests that a larger eruption can occur during the next few decades that will discharge juvenile pyroclastics and/or lava.