METADATA IN ENGLISH

About the journal

SEISMICHESKIE PRIBORY, ISSN: 0131-6230, eISSN: 2312-6965, DOI: 10.21455/si,

http://elibrary.ru/title_about.asp?id=25597

English Translation: Seismic Instruments, ISSN: 0747-9239 (Print) 1934-7871 (Online),

https://link.springer.com/journal/11990

Registration of local earthquakes under Udinsky volcanoes (Kamchatka) by regional and temporary seismic stations. Refinement of the velocity model
by reversing the hodograph of the deep source

V.Yu. Burmin1, Yu.A. Kugaenko2, V.A. Saltykov2

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

2 Kamchatka branch of the Geophysical Survey of the Russian Academy of Sciences,
Petropavlovsk-Kamchatsky, Russia

Corresponding author: V.Yu. Burmin, e-mail: burmin@ifz.ru

Abstract. Currently, Udinsky volcanoes (Kamchatka, Klyuchevskaya group of volcanoes) are considered extinct. However, at the end of 2017, for the first time in years of instrumental observations, seismic activation was recorded below them at the level of the middle-upper crust. To improve the accuracy of determining the coordinates of the hypocenters in the Udinsky volcanoes region, work was done to refine the local velocity model for this region. The refinement of the velocity structure of the medium was carried out using proprietary approaches to determining the coordinates of earthquake hypocenters and reversing the hodographs from deep sources. The values of seismic wave propagation velocities were obtained from earthquakes from the Udine seismic activation in 2017–2019. The results of the Kamchatka regional network and four additional temporary stations established specifically for the study of the Udinsky seismic generating region are used. A one-dimensional velocity model is obtained for depths up to 40 km: a set of layers in which the velocity f longitudinal waves varies linearly with a constant ratio VP/VS =1.85. The model differs noticeably from the generalized baseline curve obtained for the northern part of the Klyuchevskaya volcanoes group according to the data from the DSS. The greatest differences in velocities are observed in the upper crust (at a depth of up to 4 km) and in the region of the Konrad border, at a depth of ~20 km. In the depth range of 20–25 km, a layer with a reduced velocity was revealed.

Keywords: earthquake, volcano, seismic wave velocity, travel-time curve, Udinа seismic activation, Kamchatka

About the authors

BURMIN Valery Yurievich – Doctor of Physical and Mathematical Sciences, Chief Researcher, Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences. 123242, Moscow, ul. Bolshaya Gruzinskaya, 10, building 1. E-mail: burmin@ifz.ru

KUGAENKO Yulia Aleksandrovna – Candidate of Physical and Mathematical Sciences, Leading Researcher, Kamchatka branch of the Geophysical Survey of the Russian Academy of Sciences. 683006, Petropavlovsk-Kamchatsky, Boulevard Piipa, 9. E-mail: ku@emsd.ru

SALTYKOV Vadim Aleksandrovich – Doctor of Physical and Mathematical Sciences, Chief Researcher, Kamchatka branch of the Geophysical Survey of the Russian Academy of Sciences. 683006, Petropavlovsk-Kamchatsky, Boulevard Piipa, 9. E-mail: salt@emsd.ru

Cite this article as: Burmin V.Yu., Kugaenko Yu.A., Saltykov V.A. Registration of local earthquakes under Udinsky volcanoes (Kamchatka) by regional and temporary seismic stations. Refinement of the velocity model by reversing the hodograph of the deep source, Seismicheskie Pribory, 2019, Vol. 55, no. 3, pp. 48–60. (in Russian). https://doi.org/10.21455/si2019.3-3

English translation of the article will be published in Seismic Instruments, ISSN: 0747-9239 (Print) 1934-7871 (Online), https://link.springer.com/journal/11990), 2020, Volume 56.