Research output: Contribution to journal › Article › peer-review
Structure of volatile conduits beneath gorely volcano (Kamchatka) revealed by local earthquake tomography. / Kuznetsov, Pavel Y.; Koulakov, Ivan; Jakovlev, Andrey et al.
In: Geosciences (Switzerland), Vol. 7, No. 4, 111, 01.12.2017.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Structure of volatile conduits beneath gorely volcano (Kamchatka) revealed by local earthquake tomography
AU - Kuznetsov, Pavel Y.
AU - Koulakov, Ivan
AU - Jakovlev, Andrey
AU - Abkadyrov, Ilyas
AU - Deev, Evgeny
AU - Gordeev, Evgeny I.
AU - Senyukov, Sergey
AU - El Khrepy, Sami
AU - Al Arifi, Nassir
PY - 2017/12/1
Y1 - 2017/12/1
N2 - 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.
AB - 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.
KW - Degassing
KW - Gas contamination
KW - Gorely volcano
KW - Magma reservoir
KW - Travel-time tomography
KW - degassing
KW - SEISMIC VELOCITY STRUCTURE
KW - FIELD
KW - magma reservoir
KW - INVERSION
KW - travel-time tomography
KW - gas contamination
KW - REGION
KW - ERUPTION
KW - KLYUCHEVSKOY
KW - ACTIVE VOLCANOS
UR - http://www.scopus.com/inward/record.url?scp=85035347352&partnerID=8YFLogxK
U2 - 10.3390/geosciences7040111
DO - 10.3390/geosciences7040111
M3 - Article
AN - SCOPUS:85035347352
VL - 7
JO - Geosciences (Switzerland)
JF - Geosciences (Switzerland)
SN - 2076-3263
IS - 4
M1 - 111
ER -
ID: 9671806