Purpose. Ash clouds and plumes arising due to explosive eruptions of the volcanoes of Kamchatka and the Kuril Islands pose a great danger to aviation flights. In this regard, the urgent and important task is to predict and analyze distribution of volcanic ash in the atmosphere . To solve this task, AIS "Signal"was designed. It includes a modelling subsystem using the PUFF model. It allows predicting the direction, speed and height of the propagation of ash clouds and plumes in the atmosphere. At the same time, for more accurate assessment of the danger of ash clouds and plumes, it is necessary to determine not only their qualitative, but also quantitative characteristics, for example, the concentration of ash at the flight levels of aircrafts, the amount of ash deposited on the surface, etc. To solve this problem, research was done to expand the capabilities of the AIS "Signal"by integrating the Eulerian FALL3D model into it. The present article presents the results of this work.
Methodology. Implementation of system and user interfaces for automating the processes of collecting and preparing auxiliary data (reference information about volcanoes, meteorological data, etc.), performing numerical calculations in the FALL3D model and visualizing the obtained results both were carried out on the basis of similar interfaces created earlier in AIS “Signal” for the PUFF model. All these features significantly accelerate the process of integration the FALL3D model into the existing AIS modelling subsystem. Implementation of the operating modes of the subsystem and evaluating the efficiency of its functioning were carried out as part of the study of ash clouds and plumes propagation which are formed during explosive events of the Kamchatka volcanoes.
Findings. As part of the integration of the FALL3D model into the modelling subsystem, informational interaction of its software components with the services of AIS “Signal” was organized. Algorithms for the formation of collections of meteorological data necessary for the functioning of the model were proposed and implemented. User interfaces have been created that allow specialists to calculate the characteristics of ash clouds with the ability to set detailed initial parameters for an explosive event and model settings.
Originality. The integration of the FALL3D model in the AIS “Signal” significantly expands its ability to predict propagation of ash clouds and plumes formed during explosive eruptions of the volcanoes of Kamchatka and the Kuril Islands. In addition to the instruments for determining the direction, speed, and height of the spread of volcanic ash, tools have been developed to determine the ash concentration at the flight levels of aircrafts, as well as the thickness and mass of the ash falling on the surface of the Earth. Numerical experiments have showed a good agreement between Originality. The integration of the FALL3D model in the AIS “Signal” significantly expands its ability to predict propagation of ash clouds and plumes formed during explosive eruptions of the volcanoes of Kamchatka and the Kuril Islands. In addition to the instruments for determining the direction, speed, and height of the spread of volcanic ash, tools have been developed to determine the ash concentration at the flight levels of aircrafts, as well as the thickness and mass of the ash falling on the surface of the Earth. Numerical experiments have showed a good agreement between the obtained modelling results and the satellite data.the obtained modelling results and the satellite data.

The article presents the methods and results of the magnetotelluric sounding within the Avacha-Koryaksky group of volcanoes. Geoelectrical section was studied within the period range from 0.0001 to 1000 seconds and above. The authors performed a numerical two-dimensional modeling. Initially, we used test models for possible distortions of curves. The analysis of the magnetotelluric parametres allowed us to characterize the geoelectrical inhomogenuities. Curves along the strike and across the strike were used as main curves. Since longitudinal curves are less prone to coast effect, they were used with transverse curves in order to create a geoelectrical model based on a 2D magnetotelluric field numerical modeling. The created geolectrical model has a conductive bed in the upper part of the section that is connected with an igneous-sedimentary cover. The deep part of the model includes near-vertical conductive zones, which denote a zone with deep faults. The paper describes possible nature of the revealed anomalies and provides rough estimation of rock porosity in the conductive zones.

This book is the fi rst basic edition considering the issues of genetic volcanology. Petrological aspects of magma formation have been investigated as well as physical processes that account for the mechanisms of various types of eruptions. Continuous calc-alkaline series of the Klyuchevskoy volcano rocks (high-Mg basalts – high-Al basaltic andesites) have been shown to form due to decompression fractionation of dark-colored minerals taking place mostly between the eruptions during the pauses of magma migration. For the fi rst time a volcano has been presented as a wideband generator of periodic processes occurring within the intervals from a few seconds to a few days. To study the above processes, a unique large experimental facility representing a laboratory volcano was designed and constructed. Physical modelling carried out using this facility allowed developing a new classifi cation of gas-hydrodynamic regimes occurring in long vertical columns. Physical principles accounting for the monotonous and periodic types of eruptions of basalt and basaltic andesite volcanoes have been defi ned.
Dynamic model of the Klyuchevskoy volcano eruptions has been developed based upon the major aspects of basalt-basaltic andesite volcanism – magmatic melts evolution, periodicities in the eruption dynamics, and mechanisms of various types of eruptions.
For experts in geology, volcanology, petrology, mineralogy, geophysics, geothermal researches, oil geology, physics, gashydrodynamics, geography, and ecology.

Исследования позднечетвертичных отложений в районе пос. Ключи (Камчатка)
позволили установить и датировать природные события, происходившие здесь в последние 30
тысяч лет. Среди них лавовые излияния из региональной трещинной зоны, наложенной на
массив Плоских сопок, мощные пеплопады удаленных вулканов, андезитовый этап активности
вулкана Заречного, образование и спуск большого подпрудного озера и таяние ледников
подножия в. Шивелуч.

A large amount of unique scientific data about the Kamchatka and the Kurile Island Arc volcanoes has been collected in the Institute of Volcanology and Seismology FEB RAS. The paper describes VOKKIA and KVERT information web-systems. VOKKIA is designed to integration and systematization of heterogeneous scientific data on the terrestrial and submarine volcanoes of Kurile-Kamchatka Island Arc including data on their eruptions. The KVERT system provides collection and storage of operational data of monitoring of active volcanoes. Besides, the article describes graphical visualization services that helps to detect the relationship, patterns and trends in volcanic processes over time.