Abstract
This paper reports a study of the Tolud earthquake sequence; the sequence was a burst of shallow seismicity between November 28 and December 7, 2012; it accompanied the initial phase in the Tolbachik Fissure Eruption of 2012‒2013. The largest earthquake (the Tolud earthquake of November 30, 2012, to be referred to as the Tolud Earthquake in what follows, with KS = 11.3, ML = 4.9, MC = 5.4, and MW = 4.8) is one of the five larger seismic events that have been recorded at depths shallower than 10 km beneath the entire Klyuchevskoi Volcanic Cluster in 1961‒2015. It was found that the Tolud earthquake sequence was the foreshock–aftershock process of the Tolud Earthquake. This is one of the larger seismicity episodes ever to have occurred in the volcanic areas of Kamchatka. Data of the Kamchatka seismic stations were used to compute some parameters for the Tolud Earthquake and its largest (ML = 4.3) aftershock; the parameters include the source parameters and mechanisms, and the moment magnitudes, since no information on these is available at the world seismological data centers. The focal mechanisms for the Tolud Earthquake and for its aftershock are consistent with seismic ruptures at a tension fault in the rift zone. Instrumental data were used to estimate the intensity of shaking due to the Tolud Earthquake. We discuss the sequence of events that was a signature of the time-dependent seismic and volcanic activity that took place in the Tolbachik zone in late November 2012 and terminated in the Tolud burst of seismicity. Based on the current ideas of the tectonics and magma sources for the Tolbachik volcanic zone, we discuss possible causes of these earthquakes.
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Original Russian Text © Yu.A. Kugaenko, V.M. Pavlov, E.I. Ivanova, I.R. Abubakirov, V.A. Saltykov, 2017, published in Vulkanologiya i Seismologiya, 2017, No. 6, pp. 33–48.
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Kugaenko, Y.A., Pavlov, V.M., Ivanova, E.I. et al. The Tolud Burst of Seismicity and the Earthquake of November 30, 2012 (MC = 5.4, MW = 4.8) that Accompanied the Start of the 2012‒2013 Tolbachik Eruption. J. Volcanolog. Seismol. 11, 419–433 (2017). https://doi.org/10.1134/S0742046317060033
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DOI: https://doi.org/10.1134/S0742046317060033