Acronyms and abbreviations used in this book; Preface; 1. The Kamchatka Volcanological Station and its part in the development of Soviet volcanology; Part I. Description of the Eruption, Geological and Geochemical Data: 2. Chronology and features of the Southern Breakthrough of the Great Tolbachik Fissure Eruption 1975-1976; 3. Calculation of the magma discharge, growth in the height of the cone and dimensions of the feeder channel of Crater I in the Great Tolbachik Fissure Eruption, July 1975; 4. Activity of the Ploskiy Tolbachik volcano, June-July 1975; 5. The quantity, distribution and petrochemical features of pyroclastics of the Great Tolbachik Fissure Eruption; 6. Features of pyroclastics of the Northern Breakthrough of the Great Tolbachik Fissure Eruption and the origin of its pale-grey ash; 7. Basement xenoliths in the eruption products of the New Tolbachik Volcanoes and the problem of the formation of magma conduits in the upper crust; 8. Age divisions of the Holocene volcanic formations of the Tolbachik Valley; 9. Geology and petrochemistry of the Tolbachik regional zone of cinder cones; 10. Geochemical features of the rocks of the great Tolbachik Fissure Eruption 1975-1976 in relation to petrogenesis; 11. First results of a study of ore minerals in eruption products of the Southern Breakthrough of the Great Tolbachik Fissure Eruption; 12. Gases from the basalt flows of the Tolbachik Fissure Eruption 1975-1976; 13. Chemistry, metal content and reaction products of gases from the New Tolbachik Volcanoes of 1975; 14. The influence of volcanic eruption on the chemical composition of surface and underground waters. (As in the eruption area of the Tolbachik volcanoes, Kamchatka); Part II. Geophysical Studies: 15. The development of the Great Tolbachik Fissure Eruption in 1975 from seismological data; 16. Volcanic tremor during the Great Tolbachik Fissure Eruption in 1975; 17. A study of volcanic tremor during the Tolbachik eruption; 18. The influence of the 19-year tidal cycle on large-scale eruptions and earthquakes in Kamchatka, and their long-term prediction; 19. The focal mechanism and dynamic parameters of volcanic earthquakes preceding the Great Tolbachik Fissure Eruption of 1975; 20. Atmospheric shock waves accompanying the Great Tolbachik Fissure Eruption (September, 1975); 21. Deformations of the Earth's surface in the vicinity of the New Tolbachik Volcanoes (1975-1976); 22. Analysis of the methods and results of geodetic studies in the Tolbachik geodynamic polygon, 1975-1976; 23. Tilt of the Earth's surface during the formation of Cone II of the Great Tolbachik Fissure Eruption in 1975; 24. Changes in height, volume and shape of the New Tolbachik Volcanoes of the Northern Breakthrough; 25. The structure of the New Tolbachik Volcanoes from seismic data; 26. Study of volcanic tremor in the area of the Tolbachik eruption, using seismic instrumentation.