Geophysical data on deep-seated magmatic activity below Kamchatka and an estimate of the forces that cause the rise of magmas into volcanoes

Journal Article · Wed Jun 01 04:00:00 EDT 1977 · Int. Geol. Rev.; (United States)

DOI:https://doi.org/10.1080/00206817709471063· OSTI ID:6879160

Fedotov, S A

Using geophysical data, the mechanism of deep-seated magmatic and volcanic activity was studied in the region of the island arcs and associated structures. Data on magmatic activity below the volcanic belt of East Kamchatka, obtained during geophysical investigations, mainly during detailed seismological investigations and deep seismic sounding, provide evidence for an association between the volcanoes and the processes in the Pacific Ocean focal layer of earthquakes, and for the accumulation of magmas below the volcanic belt at depths less than 60 km. Anomalous columnar bodies more than 5 to 7 km across were found linking the volcanoes with the focal layer. There was also a very large concentration of convective heat flow and volatiles in the magma columns feeding the volcanoes. As to the role of different forces in the uprise of magmas into the volcanoes, hydrostatic forces probably predominate in the asthenosphere, supplemented by tectonic pressure in the lithosphere and forces associated with boiling of magmas during release of volatiles in the crust, especially in its upper layers.

• OSTI ID: 6879160
• Journal Information: Int. Geol. Rev.; (United States), Journal Name: Int. Geol. Rev.; (United States) Vol. 19:6; ISSN IGREA
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
152000 -- Geothermal Data & Theory
58 GEOSCIENCES
580202* -- Geophysics-- Volcanology-- (1980-1989)
CONVECTION
ENERGY TRANSFER
EUROPE
GEOPHYSICAL SURVEYS
HEAT TRANSFER
HYDROSTATICS
IGNEOUS ROCKS
INTRUSION
ISLANDS
KAMCHATKA
MAGMA
MELTING
PHASE TRANSFORMATIONS
ROCKS
SEISMIC SURVEYS
TECTONICS
USSR
VOLCANIC REGIONS
VOLCANISM