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Geosciences 2017, 7(4), 111; doi:10.3390/geosciences7040111

Structure of Volatile Conduits beneath Gorely Volcano (Kamchatka) Revealed by Local Earthquake Tomography

1
Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Prospekt Koptyuga, 3, 630090 Novosibirsk, Russia
2
Laboratory of Seismic Imaging of the Earth, Novosibirsk State University, Pirogova 2, 630090 Novosibirsk, Russia
3
Institute of Volcanology and Seismology FEB RAS, Piip Boulevard, 9, 693006 Petropavlovsk-Kamchatsky, Russia
4
Kamchatkan Branch of Geophysical Survey RAS Piip Boulevard, 9, 693006 Petropavlovsk-Kamchatsky, Russia
5
King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
6
National Research Institute of Astronomy and Geophysics, NRIAG, Helwan 11421, Egypt
*
Authors to whom correspondence should be addressed.
Received: 11 September 2017 / Revised: 27 October 2017 / Accepted: 30 October 2017 / Published: 1 November 2017
(This article belongs to the Special Issue Tomography in Volcanoes)
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Abstract

Gorely is an active volcano located 75 km from Petropavlovsk-Kamchatsky, Kamchatka. In 2010–2015, it exhibited strong activity expressed by anomalously high gas emission. In 2013–2014, we deployed a temporary network consisting of 20 temporary seismic stations that operated for one year. We selected 333 events with 1613 P-wave and 2421 S-wave arrival times to build the first tomographic model of this volcano. The seismic model was carefully verified using a series of synthetic tests. Our tomographic model provides a mechanism for volatile feeding of Gorely. An unexpected feature of the model was low Vp/Vs ratios; below 1.4 in some parts. One reason for such low Vp/Vs ratios is gas contamination due to magma degassing. In the central part of the model, directly underneath the Gorely crater, we observe a 2.5 km wide and 1.5 km thick seismic anomaly with a very high Vp/Vs ratio of up to 2. This may represent a magma reservoir with a high melt and/or volatile content. The upper limit of this anomaly, 2.5 km below the surface, may indicate the degassing level, which coincides with the most intense seismicity. Below this reservoir, we observe another columnar high Vp/Vs ratio anomaly. This can be interpreted as a conduit bringing magma and fluids from deeper sources. View Full-Text
Keywords: Gorely volcano; travel-time tomography; gas contamination; magma reservoir; degassing Gorely volcano; travel-time tomography; gas contamination; magma reservoir; degassing
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kuznetsov, P.Y.; Koulakov, I.; Jakovlev, A.; Abkadyrov, I.; Deev, E.; Gordeev, E.I.; Senyukov, S.; El Khrepy, S.; Al Arifi, N. Structure of Volatile Conduits beneath Gorely Volcano (Kamchatka) Revealed by Local Earthquake Tomography. Geosciences 2017, 7, 111.

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