The 2019–2021 Eruptions of Klyuchevskoy Volcano (Kamchatka)

The paper contains the data on volume of erupted products from both lateral and summit eruptions over the period 1932–1989. The paper shows that over that period the volume of the erupted products from lateral eruptions prevailed over that ones from summit eruptions. We also examined further changes of the volcano eruptive nature. From 1932 to 1989 the volcano was producing both summit and lateral eruptions, but over the period 1993–2016 Klyuchevskoy was only producing summit eruptions. In 2016, the volcano resumed lateral eruptions on its slopes. It was revealed that each summit eruption caused formation of pits in the volcano’s central crater. The paper provides specific features of those pits. The collapsed crater’s formation is associated with changes in the magma density and volume as it rises to the surface. The article provides the data on the 2019–2021 summit eruptions and the 2021 lateral eruption named after G.S. Gorshkov. The paper also contains the updates on morphological evolution of both the summit crater during the eruptions and the pits inside the crater after the eruptions.