Kugelblick.de

Brubbel - A Cold Geyser - Wallenborn/Volcano Eifel
This type of geyser is unique in Europe. The water is cold, 15°C. This region used to be volcanically active. Brubbel is driven to erupt every 30 minutes by CO₂ from a chamber 30 meters down.
In the cavern CO₂ gets in solution in the water until it is saturated. More CO₂ starts to rise the pressure in the chamber till the water starts to rise again. With less hydrostatic pressure in the water column, CO₂ starts to degas in the ascending water and forces the water to ascend faster. The cold geyser erupts.
This happens every 30 minutes, though every second eruption is higher, up to 3-4 meters.
My panorama depicts the smaller of the two eruptions. I liked that version more than the one I took half an hour later. In this one a group of people, who likely attended a funeral before, came by to watch Brubbel and to their opposite some belgian or dutch tourists in shorts.

Location (lat, lon): 50.1538 N, 6.7202 E
Date: 2005-06-19 15:56:00

Click in the pano and drag. Zoom in and out are Shift and Control.