Sedimentary and volcanic-sedimentary rocks from natural exposures on the Phu-Qui and Katuik volcanic islands (Vietnam Shelf) have been analyzed for their elemental composition. Mineralogically and petrochemically, sandstone rocks of Phu-Qui Island are petrogenic compounds and refer to subarkose. Judging by the prevalence of quartz and feldspar, by the dominance of sialic association in the heavy mineral fraction as well as by the pattern of major, minor and rare-earth element distribution, the main sources of clasts were intrusive and metamorphic rocks of the mature continental crust, and sedimentation settings correspond to passive continental margins. The Middle Pleistocene volcanic-sedimentary rocks of the Phu-Qui – Katuik group of islands are composed of pyroclastic material of mafic composition close to the basalts from trachybasalt-trachytic and alkaline basaltic series of Vietnam, which possess intraplate characteristics and relate to the existing here extension settings. The sedimentation occurred in subaerial environment near the centers of volcanic eruptions.

The paper provides results from application of modern computer techniques for interpretation of materials from complex geophysical investigation of submarine Makarov Volcano, the Kurile island arc. Investigations allowed evaluation of rock magmatic properties in-situ, and helped to determine that the most magnetized parts of the edifice are its ridge top and a part of the southern flank up to 2300 m deep. A causative magnetic body traced to the depth of 11,5 km was revealed. The authors suggest that there is a petrified peripheral magmatic chamber at depths from 2,5 to 4,2 km and that a subvertical feeding system of the volcano.

Modern techniques for interdisciplinary investigation of submarine volcano 6.1 in the Kurile island arc. The paper suggests that there are peripheral magmatic chambers at depth 4,1 - 5,2 km and subvertical conduit channels, submarine volcano, Kurile island arc.