We use SESL’09 technique for a unified estimation of seismicity level in a given space-time regions. The application of the distribution function of radiated seismic energy permits the formalization of qualitative description of seismicity. We present the results from statistical estimations of seismicity level before the 2000- 2012 Bezymianny Volcano eruptions. The state of seismicity was describes by the monogram, constructed according the SESL’09 technique. By processing the Klyuchevskoy volcano group seismic catalog, we estimated variations of seismicity and detected background level. Statistically significant variations of the seismicity level preceded the eruptions were detected and discussed.

The article describes the alternative mechanisms of earthquakes and volcanic eruptions in which the leading role is played by the deep compact fluid areas. Redistribution of fluid pressure between these areas due to the migration of fluids along fractures and faults can provoke seismic and volcanic activity in the region, as well as determine the different sorts of their interdependence.

The article provides an algorithm for recovery of parameters of ash emissions (total volume and its height distribution) during explosive eruptions. The solution for the corresponding inverse task uses a multiple regression approach with minimal a prior information on the eruption dynamics. As an example, we consider a strong explosive event at Bezymianny Volcano, Kamchatka, on 24.12.2006. The estimations showed that the mass distribution for ash emission with heights was partially controlled by the emission of ash material inside the clouds from pyroclastic flows. This peculiarity was revealed as a bimodal distribution of the emission mass with maximums at the mid tropospheric and low stratospheric heights.

The paper presents the results from investigation of remnant magnetization of submarine volcanic edifices within the Kuril island arc (KIA) based on data on hydromagnetic survey using software IGLA. Magnetic orientations of remnant magnetization of the studied submarine volcanoes within KIA differ from those of the modern geomagnetic field. The authors suggest that submarine volcanic activity coincided with the periods of worldwide geomagnetic disturbance.

The authors studied siliceous limestones from the Vetlovsky complex of the Vakhil rise (Eastern Kamchatka). The paper provides their lithological and geochemical characteristic. The new limestones were compared with the previously studied limestones from the Albian-Cenomanian Smagin association of the Kamchatsky Mys peninsula, as well as with Cretaceous carbonates from the Pacific underwater rises. Limestones from the Vetlovsky complex deposited in the pelagic environments at low sedimentation rates, and under oxidizing conditions. Terrigenous input in deposits was insignificant. According to the geochemical data, some layers of limestones contain pyroclastics of various composition, which indicate a deposition in the area of island arc volcanism effect. The sedimentation occurred on the oceanic intraplate volcanic rise or on the internal rise of backarc basin. The major part of siliceous-carbonate oozes were forming between depths of 1-1.5km.