Nepostoyannyy (inconstant) geyser is one of the five largest geysers on the Vitrazh. It is located above and to the right from the Dvoynoy geyser. It has an irregular eruption schedule; time between the eruptions varies from 1 to 5 minutes.
The outlet of this geyser is a narrow crack several meters long. The eruption consists of several wide powerful splashes on the left side of the crack, followed by continuous spouting of a narrow jet on the right side of the crack. The height of splashes is 3 meters in average, while some rare splashes reach 5— 6 m.
This is how Tatyana Ustinova described it's eruption: "Eruption starts with a water discharge 3 meters high, after that water shoots up significantly lower — only to 1—1.5 meters. Periods of boiling and splashing alternate with slow outflow. Boiling and slow periods last about 12 seconds each. Half an hour after the start of the eruption, boiling period only lasts 10—12 seconds, while the period of slow outflow lasts 12—20 seconds. Eruption lasts 1 hour and 14 minutes; the water consistently flows out of the vent all this time. After that, there's a period of calm, for close to half an hour, the spring doesn't function at all. No water flows out and no sounds are coming from inside it. Therefore this pulsating spring can be considered as an unconventional geyser." (T.I. Ustinova, "Kamchatka Geysers", 1955).
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