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Open AccessArticle

Clustering of Long-Period Earthquakes Beneath Gorely Volcano (Kamchatka) during a Degassing Episode in 2013

1
Institut de Physique du Globe de Paris, Université de Paris, CNRS UMR7154, 1 rue Jussieu, 75238 Paris, France
2
Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Prospekt Koptyuga, 3, 630090 Novosibirsk, Russia
3
Institut des Sciences de la Terre (ISTERRE), UMR CNRS 5375, Université Grenoble-Alpes, 38058 Grenoble, France
4
Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, 119991 Moscow, Russia
5
Laboratory of Seismic Imaging of the Earth, Novosibirsk State University, Pirogova 2, 630090 Novosibirsk, Russia
6
Institute of Volcanology and Seismology FEB RAS, Piip Boulevard, 9, 693006 Petropavlovsk-Kamchatsky, Russia
*
Authors to whom correspondence should be addressed.
Geosciences 2020, 10(6), 230; https://doi.org/10.3390/geosciences10060230
Received: 7 May 2020 / Revised: 1 June 2020 / Accepted: 12 June 2020 / Published: 14 June 2020
(This article belongs to the Special Issue Magma Reservoir Dynamics)
Gorely is one of the most active volcanoes in Kamchatka with a rich magmatic and eruptive history reflected in its composite structure. In 2013–2014, a temporary network of 20 seismic stations was installed on Gorely for one year. During the four months of its high degassing rate, seismic activity was mostly expressed in the form of a long-period (LP) seismic tremor. In this study, we have developed a workflow based on the combination of back-projection (BP), cluster analysis, and matched-filter (MF) methods. By applying it to continuous seismic records for the study period, we were able to identify discrete LP events within the tremor sequence automatically and individually investigate their properties. A catalog obtained using the BP detection algorithm consist of 1741 high-energy events. Cluster analysis revealed that the entire variety of LP earthquakes in this catalog could be grouped into five families, which are sequentially organized in time. Utilizing templates of these families in the MF search resulted in the complementary catalog of 80,615 low-energy events. The long-term occurrence of highly repetitive LP events in the same location may correspond to resonating conduits behaving in response to the high-pressure gases flowing from the decompressed magma chamber up to the volcano’s crater. View Full-Text
Keywords: Gorely volcano; degassing; long-period seismicity; cluster analysis; back-projection; matched-filter Gorely volcano; degassing; long-period seismicity; cluster analysis; back-projection; matched-filter
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Abramenkov, S.; Shapiro, N.M.; Koulakov, I.; Abkadyrov, I. Clustering of Long-Period Earthquakes Beneath Gorely Volcano (Kamchatka) during a Degassing Episode in 2013. Geosciences 2020, 10, 230.

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