Bulletin Volcanologique

, Volume 43, Issue 1, pp 35–45 | Cite as

Crustal deformations related to the formation of new tolbachik volcanoes in 1975–1976, Kamchatka

  • S. A. Fedotov
  • V. B. Enman
  • Yu. P. Nikitenko
  • M. A. Maguskin
  • V. E. Levin
  • S. V. Enman
Article

Abstract

The paper discusses the results of geodetic investigations performed in the region of the large 1975–1976 Tolbachik fissure eruption in Kamchatka. Using data from repeated triangulation and trigonometric levelings, horizontal and vertical displacements have been detected in an area of 3,500 km2. Two zones have been recognized: the tension and uplift zone that is probably due to magma intrusion from depths to the surface along the line of new cones and the extensive compensative subsidence zone located at a distance of 20–50 km from the nearest newly-formed cones.

Measurements made with small distance measuring device showed the dynamics of feeding basalt dykes intrusion and made it possible to determine their width (a little greater than 1 m) and magma and gas overpressure (50–250 bar). Data have been obtained on dimensions and growth of cones and on vertical ground deformation in the area of new cones during and after the eruption.

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References

  1. Fedotov, S. A., 1976,The Ascent of Basic Magma in the Earth’s Crust and Mechanism of Fissure Basaltic Eruptions. Izv. AN SSSR. Ser. Geol., 10 (in Russian).Google Scholar
  2. Fedotov, S. A., Enman, V. B., Maguskin, M. A., Levin, V. E. andZharinov, N. A., 1976a.Basalt Intrusion and Formation of the Large 1975 Tolbachik Eruption Feeding Fissures According to Geodetic Data. Dokl. AN SSSR, 229-1, p. 170–173 (in Russian).Google Scholar
  3. -----,Gorelchik, V. I. andStepanov, V. V., 1976b.Seismological Data on Magma Chambers, Mechanism and Evolution of the 1975 Tolbachik Basalt Fissure Eruption in Kamchatka. Dolk. AN SSSR. 228-6, p. 1407–1410 (in Russian).Google Scholar
  4. Zheltov, Yu. P., 1975,Mechanism of Oil and Gas bearing Layer, Moscow, Nedra, 450 pp. (in Russian).Google Scholar

Copyright information

© Intern. Association of Volcanology and Chemistry of the Earth’s Interior 1980

Authors and Affiliations

  • S. A. Fedotov
    • 1
  • V. B. Enman
    • 1
  • Yu. P. Nikitenko
    • 1
  • M. A. Maguskin
    • 1
  • V. E. Levin
    • 1
  • S. V. Enman
    • 1
  1. 1.Institute of VolcanologyFESC, USSR Academy of SciencesPetropavlovsk-KamchatskiiUSSR

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