Abstract
An analysis of local seismicity within the Avacha–Koryakskii Volcanic Cluster during the 2000–2016 period revealed a sequence of plane-oriented earthquake clusters that we interpret as a process of dike and sill emplacement. The highest magmatic activity occurred in timing with the 2008–2009 steam–gas eruption of Koryakskii Volcano, with magma injection moving afterwards into the cone of Avacha Volcano (2010–2016). The geometry of the magma bodies reflects the NF geomechanical conditions (tension and normal faults, \(S_V>S_{H_{\text{max}}}>S_{h_{\text{min}}}\)) at the basement of Koryakskii Volcano dominated by vertical stresses S v , with the maximum horizontal stress \(S_{h_{\text{max}}}\) pointing north. A CFRAC simulation of magma injection into a fissure under conditions that are typical of those in the basement of Koryakskii Volcano (the angle of dip is 60°, the size is 2 × 2 km2, and the depth is –4 km abs.) showed that when the magma discharge is maintained at the level of 20000 kg/s during 24 hours the fissure separation increases to reach 0.3 m and the magma injection is accompanied by shear movements that occur at a rate as high as 2 × 10–3 m/s, thus corresponding to the conditions of local seismic events with Mw below 4.5. We are thus able to conclude that the use of planeoriented clusters of earthquakes for identification of magma emplacement events is a physically sound procedure. The August 2, 2011 seismicity increase in the area of the Izotovskii hot spring (7 km from the summit of Koryakskii Volcano), which is interpreted as the emplacement of a dike, has been confirmed by an increase in the spring temperature by 10–12°C during the period from October 2011 to July 2012.
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Original Russian Text © A.V. Kiryukhin, S.A. Fedotov, P.A. Kiryukhin, E.V. Chernykh, 2017, published in Vulkanologiya i Seismologiya, 2017, No. 5.
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Kiryukhin, A.V., Fedotov, S.A., Kiryukhin, P.A. et al. Magmatic plumbing systems of the Koryakskii–Avacha Volcanic Cluster as inferred from observations of local seismicity and from the regime of adjacent thermal springs. J. Volcanolog. Seismol. 11, 321–334 (2017). https://doi.org/10.1134/S0742046317050049
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DOI: https://doi.org/10.1134/S0742046317050049