Geyser Nepostoyanny (Inconstant) is located on the left side of the Vitrazh (Stained Glass Wall). The channel of this geyser is a narrow crack more than 3 m long. It was first described and named by T.I. Ustinova, who considered it as a periodically pulsating spring. Its irregular mode has been maintained for more than 60 years, only the period has changed: in 1990-2000 it was 10-60 min (Sugrobov et al., 2009), in 2011 - 1-5 min (Leonov, 2017). In 2016-2018, the geyser regime (eruptions from the left part of the crack) became more stable: in 2019-2024 the period became 5-8 min, the fountaining duration 10-15 s and height about 3 m. There is no outporing, the fountaining begins suddenly (observations of Belousovs).
References
Леонов А.В. Каталог гейзеров Кроноцкого заповедника. Долина гейзеров и кальдера вулкана Узон: история и современность. М.: Изд-во ООО «Реарт». 2017. 384 с.  Сугробов В.М., Сугробова Н.Г., Дрознин В.А., Карпов Г.А., Леонов В.Л. Жемчужина Камчатки – Долина Гейзеров, научно-популярный очерк, путеводитель / Отв. ред. Поляк Б.Г. Петропавловск-Камчатский: Изд-во «Камчатпресс». 2009. 108 с. Устинова Т.И. Камчатские гейзеры / Отв. ред. Рихтер Г.Д., Никольская В.В. М.: Географгиз. 1955. 119 с.  |
