Abstract
The paper considers the distribution of ash during the paroxysmal eruption of the Shiveluch volcano located in the north of Kamchatka, which lasted from April 10‒13, 2023, and its impact on the water resources of the areas covered by the ashfall. The thickness of ash deposits in different localities and their granulometric composition are characterized. It is shown that the dynamics of the volcanic eruption plays the main role in the distribution of ash clouds, but the atmospheric circulation actually determines the spatial distribution of the thickness of deposits. The water-soluble salts contained in ashes and the dynamics of their leaching under natural conditions are determined. Calcium and magnesium sulfates and sodium chloride dominate in the composition of the water-soluble part of fresh ashes, with subordinate amounts of aluminum, potassium, and ammonium chlorides and fluorides. Well-soluble chlorides wash out of ashes first, followed by sulfates. Over time, the total content of soluble salts decreases and their qualitative composition changes: calcium, magnesium and sodium hydrocarbonates begin to dominate. Several months after the eruption, the impact of the ashfall on the waters of the settlements, including open springs on the day surface, leveled off.
Published Version
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