Bulletin Volcanologique

, Volume 37, Issue 2, pp 245–257 | Cite as

Earthquakes, characteristics of the upper mantle under kamchatka, and their connection with volcanism (according to data collected up to 1971)

  • S. A. Fedotov
  • P. I. Tokarev


This paper presents new data on the upper mantle characteristics, and on seismicity and volcanism in Kamchatka.

It is shown that the seismic activity in the Pacific focal layer decreases sharply below that narrow line on which the foci of the active volcanoes are situated. A map of longitudinal wave velocitiesVp in the mantle upper layers under Kamchatka is given. The lowest values ofVp (7.3–7.6 km/sec) are found near the volcanic belt. The graphs Θ=lg (Es/Ep) (h) for the Kamchatka earthquakes indicate that Θmin at the depths of 120–250 km may be caused by a concentration of magmatic melts. A map of bodies (magma chambers?) screening S- and P-waves at the depths of 30–100 km under Kamchatka has been compiled. These bodies are mainly located under the belt of active volcanoes.


Seismic Activity Volcanic Belt Active Volcano Energy Class Earthquake Focus 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Stabilimento Tipografico Francesco Gianninni & Figli 1973

Authors and Affiliations

  • S. A. Fedotov
    • 1
  • P. I. Tokarev
    • 2
  1. 1.Institute of VolcanologyPetropavlovsk-Kamchatskiy
  2. 2.Institute of Physics of the EarthAcademy of Sciences of USSRMoscow

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