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On Deep Structure, Properties of the Upper Mantle, and Volcanism of the Kuril-Kamchatka Island Arc According to Seismic Data

Fedotov S.A. (1968) On Deep Structure, Properties of the Upper Mantle, and Volcanism of the Kuril-Kamchatka Island Arc According to Seismic Data // The Crust and Upper Mantle of the Pacific Area Washington, DC: American Geophysical Union Vol. 12. pp. 131-139. doi: 10.1029/GM012p0131.

Full text not available from this repository.

Official URL: http://dx.doi.org/10.1029/GM012p0131

Abstract

The results of detailed seismic investigations during the period 1961 to 1964 are described. Accurate data of focus location for Kamchatka and the Commander Islands are cited. The majority of earthquakes are located in the Pacific focal zone and the others are found in such remarkable tectonic regions as the east Kamchatka ranges, the continental slope of the Commander Islands, etc. The focal zone seismic activity decreases with increasing depth. The seismic activity at a depth of 250 km is 100 times less than the activity at a depth of 0–20 km. Kamchatka earthquake locations in relation to the Kuril-Kamchatka Island arc and deep water trench are approximately the same as those of the south Kuril Island earthquakes. The Kamchatka active volcano belt coincides with the region of earthquakes having focal depths of 100–200 km, especially between 125 and 175 km. S-wave screening in the magma chambers under the volcanoes is observed. The Avacha volcanic cluster magma chamber at a depth of 20–80 km has the form of a column, 25 km in diameter. P-wave velocity in the upper mantle under the Pacific Ocean and between the Aleutian trench and the Kuril-Kamchatka trench is about 8.2 km/sec, and under Kamchatka 7.7 km/sec. Local velocity decreases to basaltic range (Vp = 72 km/sec) in the upper mantle at a depth near 70 km under the east Kamchatka active volcano belt.
Item Type: Book Section conference proceedings
Title: On Deep Structure, Properties of the Upper Mantle, and Volcanism of the Kuril-Kamchatka Island Arc According to Seismic Data
Language: English
Title of Book: The Crust and Upper Mantle of the Pacific Area
ISSN Print: 23288779
ISBN: 9780875900124
Subjects: State scientific and technical information rubricator (ГРНТИ) > 37 ГЕОФИЗИКА > 37.31 Физика Земли > 37.31.19 Сейсмология
State scientific and technical information rubricator (ГРНТИ) > 38 ГЕОЛОГИЯ > 38.37 Петрография > 38.37.25 Вулканология
Volcanoes > 1 Volcanoes of the Kurile-Kamchatka Region > _ Volcanoes of Kurile-Kamchatka Region
Depositing User: С.Э. Васильев
Date Deposited: 08 Oct 2014 08:17
Last Modified: 13 Oct 2014 05:16
URI: http://repo.kscnet.ru/id/eprint/1885

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