The actual collective monograph presents the results of both theoretical and experimental studies of the multi-disciplinary problem on volcanic hazard assessment and development of techniques for prediction of catastophic eruptions. The volcanism of Kamchatka and other regions of Russia has been analyzed. On the basis of geological, volcanological and tephrachronological studies including radiocarbon dating, there have been defined certain groups of volcanoes on different stages of evolution. At the same time the problem of determination of the internal structure of volcanic dome using modem theoretical methods and technologies is well investigated. The new techniques of estimation of volcanic hazard were developed. Whenever ti is required, theoretical approaches are confirmed by results of in-field observations.

The book will satisfy the needs of Earth sciences specialists from a variety of backgrounds, volcanology, geo-mechanics, ecology, industrial constuction applications and hazard assessment.

The book includes the results of studying of gasgeochemical fields in water, gases and mineral associations in the bottom sediments of the Sea of Okhotsk and some other marginal seas. The works have been carried out by the authors since 1980. The authors try to explain the correlation between gaseous, gasgeochemical and mineralogical fields. Great attention is paid to the formation of background and anomal fields, interrelation of anomal gas fields with holding them bottom sediments and environment. The data make possible to explain scientifically some regular interrelations of gasgeochemical fields with mineral associations in sea conditions. The results can be used as indicators of oil-gas deposits and in order to map fracture zones, estimate seismotectonic activity of that zones and an influence of gas fluxes on environment