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GEOPHYSICAL OBSERVATIONS OF THE EBEKO VOLCANO’S ERUPTION (PARAMUSHIR ISLAND, RUSSIA) OVER THE PERIOD SEPTEMBER 2018 – APRIL 2019

2020; Linguagem: Inglês

10.31431/1816-5524-2020-1-45-89-99

1816-5532

П. П. Фирстов, Р.Р. Акбашев, E. O. Makarov, Т. А. Котенко, D. I. Budilov, M.A. Lobacheva,

earthquake and tectonic studies

The paper presents the results of integrated geophysical observations of the Ebeko Volcano's activity in late 2018 and early 2019. The instrument complex for observation was located at the Severo-Kurilsk seismic station at a distance of 7.2 km far from the volcanic crater. Three types of response in the vertical component of the electric field of the atmosphere have been distinguished during the drift of eruptive clouds from the Ebeko Volcano's explosions, which gives evidence for various mechanisms of their occurrence. The registration of infrasonic acoustic signals in the near zone made it possible to estimate the trinitrotoluene equivalent for the strongest explosions, which was calculated to be about 100 kg of trinitrotoluene. The authors have revealed certain regularities in the dynamics of the volumetric activity of radon, associated with variations in meteorological values and hydrological features of the registration point. A long period of its activity and the proximity of the observation point to the crater give reason to suggest Ebeko Volcano to be a natural laboratory for studying the mechanisms of eruptions.