CONNECTION OF PARAMETER VP/VS WITH THE STATUS OF MAGMATIC SUBSTANCE AND THE ACTIVITY OF THE NORTHERN GROUP OF KAMCHATKA VOLCANOES

1 Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia

2 Kamchatka Branch of the Federal Research Center «Geophysical Survey of Russian Academy of Sciences», Petropavlovsk-Kamchatsky, Russia

* e-mail: slavina@ifz.ru

Abstract. Dynamics of volcanic activity, the magmatic feeding system, accumulation, movement and composition of magmas, structure of roots of Northern group of volcanoes of Kamchatka are considered. Monitoring results of a field of the ratio of velocity of seismic P- and S-waves, the VP/VS parameter, in the region of Klyuchevskoy group on the data of the volcanic earthquakes registered by a network of telemetric seismic stations are presented. The parameter changes in space and time during the periods of volcanic activity. For various departments of volcanic construction and the periods of activity the behavior of a field is characteristic. In the intermediate magmatic centers low VP/VS values are observed. Under the Klyuchevskoy volcano, at depths the 8–10 km, near Flat Tolbachik, at depths the 3–5 km that is connected with a condition of substance and temperature in these areas, and receipt from bark and a cloak of a new portion of magmatic fusion and a fluid and gas component. The question of a ratio of volcanic earthquakes and earthquakes in a focal zone of Kamchatka, i.e. communication of a zone of a subduction, the plunging Pacific plate, and the power supply of volcanoes is considered. It is shown that feeding area of volcanoes of NGV isn't one, namely Klyuchevskoy the peripheral. center. Volcanoes, according to the VP/VS values, have different magma composition, which is caused by the difference in the physicochemical and temperature features of the environment. We believe that the feeding area of volcanoes of Northern group is a «neutral layer».

Keywords: volcano, feeding system, magma composition, earthquake, seismic wave velocity.

About the authors

SLAVINA Lidya B. – Cand. Sci. (Phys. and Math.), leading researcher, Schmidt Institute of Physics of the Earth, Russian Academy of Sciences. Moscow, Russia. Tel.: +7 (499) 254-87-25. E-mail: slavina@ifz.ru

KUCHAI Mark S. – senior researcher, Schmidt Institute of Physics of the Earth, Russian Academy of Sciences. Moscow, Russia. Tel.: +7 (499) 254-99-50. E-mail: kuchay@ifz.ru

LIKHODEEV Dmitry V. – Cand. Sci. (Phys. and Math.), senior researcher, Schmidt Institute of Physics of the Earth, Russian Academy of Sciences. Moscow, Russia. Tel.: +7 (499) 254-90-80. E-mail: dmitry@ifz.ru

SENYUKOV Sergey L. – Cand. Sci. (Phys. and Math.), leading researcher, Kamchatka Branch of the Federal Research Center «Geophysical Survey of Russian Academy of Sciences». Petropavlovsk-Kamchatsky, Russia. Tel.: +7 (4152) 30-25-02. E-mail: ssl@emsd.iks.ru

Cite this article as: Slavina L.B., Kuchai M.S., Likhodeev D.V., Senyukov S.L. Connection of parameter Vp/Vs with the status of magmatic substance and the activity of the Northern group of Kamchatka volcanoes, Geofizicheskie Protsessy i Biosfera (Geophysical Processes and Biosphere), 2019, vol. 18, no. 2, pp. 28–50 (in Russian). https://doi.org/10.21455/gpb2019.2-3

English version: Izvestiya, Atmospheric and Oceanic Physics, 2019, vol. 55, iss. 8. ISSN: 0001-4338 (Print), 1555-628X (Online). https://link.springer.com/journal/volumesAndIssues/11485