Seismic velocity changes beneath Ebeko Volcano (Kuril Islands) based on observations in July-August 2021

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Abstract

Here we present seismic velocity changes in the northern part of Paramushir Island, where presently active Ebeko Volcano is located. We use the data of a seismic network that operated in this area in 2021–2022 during a continuous eruption activity of Ebeko. We selected the data from July 1 to August 15, when most stations of the network provided prompt recording of seismic signals. The velocity changes were derived from the ambient noise cross-correlation functions. To identify common features in the obtained velocity variation curves, we have performed the cluster analysis and separated all the curves in two groups having similar shapes within each group, but strongly different between the groups. Velocity changes in Cluster 1 corresponding to the station pairs covering the entire Northern Paramushir have some delayed correlation with the precipitation intensity, implying that these changes might be caused by meteoric fluid migration. In Cluster 2, which is more concentrated in the area of Ebeko Volcano, the velocity changes are apparently connected with both external factors (precipitation and atmospheric pressure) and internal indicators of volcano activity (phreatic explosions, seismicity, thermal anomalies and gas emission).

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About the authors

Ya. M. Berezhnev

Trofimuk Institute of Petroleum-Gas Geology and Geophysics of the Siberian Branch of the Russian Academy of Sciences; Skolkovo Institute of Science and Technology (Skoltech)

Author for correspondence.
Email: BerezhnevYM@ipgg.sbras.ru
Russian Federation, Novosibirsk; Moscow

N. N. Belovezhets

Trofimuk Institute of Petroleum-Gas Geology and Geophysics of the Siberian Branch of the Russian Academy of Sciences; Skolkovo Institute of Science and Technology (Skoltech)

Email: BerezhnevYM@ipgg.sbras.ru
Russian Federation, Novosibirsk; Moscow

I. Yu. Koulakov

Trofimuk Institute of Petroleum-Gas Geology and Geophysics of the Siberian Branch of the Russian Academy of Sciences; Skolkovo Institute of Science and Technology (Skoltech); Institute of the Earth’s Crust Siberian Branch of the Russian Academy of Sciences

Email: BerezhnevYM@ipgg.sbras.ru

Corresponding Member of the RAS

Russian Federation, Novosibirsk; Moscow; Irkutsk

A. V. Jakovlev

Alfred-Wegener-Institut

Email: BerezhnevYM@ipgg.sbras.ru
Germany, Bremerhaven

M. S. Alajmi

KingAbdulaziz City of Science and Technology

Email: BerezhnevYM@ipgg.sbras.ru
Saudi Arabia, Riyadh

E. I. Gordeev

Institute of Volcanology and Seismology Far Eastern Branch of the Russian Academy of Science

Email: BerezhnevYM@ipgg.sbras.ru

Academician of the RAS

Russian Federation, Petropavlovsk-Kamchatsky

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Supplementary files

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2. Fig. 1. Research area and data distribution. (a) A map of the northern Kuril Islands and southern Kamchatka with an indication of the research area (blue rectangle). The red dots represent Holocene volcanoes. (b) A research area with marked temporary and permanent seismic stations (black and purple triangles, respectively). A relief with an interval of 200 m is depicted on the background. The red areas depict Holocene lava flows. White stars represent cones. Large volcanic centers are marked in brown and yellow: VER – Vernadsky; BIL – Bilibin; KRA – Krasheninnikov; BOG – Bogdanovich; NEO – Unexpected; EBE – Ebeko. (c) Time schedules for registration of seismic stations.

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3. Fig. 2. The upper part is an example of daily cross-correlations across pairs of SKR-VER13 stations in the frequency band 0.125–0.25 Hz after averaging over a sliding window. The gray parts indicate correlation times that were not used to estimate velocity changes. The resulting velocity changes for this correlogram are shown in the bottom panel.

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4. Fig. 3. Average velocity curves and their standard deviations for the frequency ranges 0.125–0.25 Hz and 2-4 Hz for the 1st and 2nd groups, indicated in pink and blue colors, respectively.

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5. Fig. 4. Clustering results. (a), (b) Pairs of stations (black dots) corresponding to groups 1 and 2 (red and blue lines, respectively). (c) Average velocity curves for the frequency ranges 0.125–0.25 Hz and 2-4 Hz (purple and green lines, respectively) for groups 1 and 2, indicated by pink and blue backgrounds, respectively.

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6. Fig. 5. Normalized average curves of velocity changes in comparison with meteorological data and the activity of the Ebeko volcano. The daily activity of Ebeko was determined according to the data of the CF GS RAS [17] and KVERT [19].

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