Strokkur, or 'The Churn' in Iceland, is a geyser that is situated in the geothermic region beside the Hvitá River in Iceland at 64°18′46.55″N, 20°18′3.48″W. A group of steaming, hot water and bubbling mud is located in this area and the Stóri Geysir, or Great Gusher, once the most powerful geyser of the group, is located in this site. The other geysers were named after it-the Icelandic word geysir means 'to gush'. Clepsydra Geyser in Yellowstone A geyser is a type of hot spring that erupts periodically, ejecting a column of hot water and steam into the air. ... There is more than one river called Hvítá in Iceland. ...

Strokkur is only a few metres away from Geysir, the original geyser. However, unlike Geysir which erupts infrequently and may be dormant for years at a time, Strokkur erupts very reliably every 5-10 minutes, hurling boiling water to heights of up to 20 metres (70ft) towards the sky. After a few seconds, the fountain subsides and the waters around it calms down. During these times, Strokkur appears as a sheet of clear water surrounded by steam. The erupting Great Geysir Geysir (sometimes known as The Great Geysir), in the Haukadalur valley, Iceland, is the oldest known geyser and one of the worlds most impressive examples of the phenomenon. ...

Once, the waters of this world-famous hot spring reached 70m (230ft). In 1810, it was active every 30 minutes; five years later the time between the eruptions was as much as six hours, and in 1916, the eruptions suddenly ceased. 19 years later, in 1935, the geyser began to erupt again on its old schedule of every 30 minutes after some of its water had been drained off.

Today the Stóri Geysir is quiet again, giving little hint of its past splendour. Occasionally technicians prompt it to put on a spectacular display for visitors by pouring large amounts of liquid soap into the pool. This increases the density of the water, which acts like a lid on the geyser, preventing steam from escaping. When some of the soap solution is removed from the vent, the pressure is relieved and the geyser erupts.

Strokkur eruption sequence

Strokkur preparing to erupt	Water bubble forms
Water bubble breaks	Strokkur erupts explosively

Wikimedia Commons has media related to:

Strokkur

This image (C) User:Pcb21, 2003. ... This image (C) User:Pcb21, 2003. ... Download high resolution version (922x614, 63 KB)This image (C) User:Pcb21, 2003. ... Download high resolution version (922x614, 63 KB)This image (C) User:Pcb21, 2003. ... Download high resolution version (922x614, 63 KB)This image (C) User:Pcb21, 2003. ... Download high resolution version (922x614, 63 KB)This image (C) User:Pcb21, 2003. ... Download high resolution version (922x614, 66 KB)This image (C) User:Pcb21, 2003. ... Download high resolution version (922x614, 66 KB)This image (C) User:Pcb21, 2003. ... Image File history File links Commons-logo. ... Wikimedia Commons logo by Reid Beels The Wikimedia Commons (also called Commons or Wikicommons) is a repository of free content images, sound and other multimedia files. ...

External links

Wikimedia Commons has media related to:

Strokkur

• Information and photos of Strokkur
• A little movie clip that shows Strokkur errupting