The paper provides results from application of designed modern computer techniques for interpretation of materials from complex geophysical investigation of submarine volcanoes 2.7 and 2.8, which are located west of the south-western coast of Onekotan Island in the Kurile island arc. The research resulted in estimation of rock magnetic properties in natural deposits and revealed that the south-western flanks of submarine volcano 2.8 are the most magnetized with their productive magnetization of about 2 A/m. The authors suggested that the feeding channels of volcano 2.7 stretch southwest, while the feeding channels of volcano 2.8 stretch subverticaly, southwest and southeast. A peripheral magma chamber of the volcano was revealed at the depth of about 650 m.

Tephrochronologic studies conducted in the Levaya Avacha River valley helped determine the true age of the Veer cinder cone, which formed approximately in 470 AD (1600 14C BP). These data refute the existing idea that it was generated in 1856. The monogenetic Veer cone should be cancelled from the catalogs of historical eruptions and active volcanoes in Kamchatka. The eruption of this cone was a reflection of the all-Kamchatkan increase in the activity of endogenous processes that occurred in 0–650 AD.

The article presents data on horizontal and vertical surface deformations obtained during geodetic measurements in 1976-2011 around the North Vent of the 1975-1976 Greate Fissure Tolbachik Eruption. Instrumental measurements of the relative vertical deformations show lowerings to 233 cm associated with the surface deflection due to formation of cinder cones and thick deposits of fresh lavas. The decrease of baselines suggests horizontal compressive strains caused by stress relief, arisen during the eruption, and volume reduction of cooling-down near-surface basalt dykes.