Geysir - also known as The Great Geysir, has been active for approximately 10,000 years and, according to records, it's been known to reach 170 metres in height. However, it's eruptions are currently much less frequent than it's neighbour, Strokkur. The channel, of Geysir, becomes clogged with silica and eruptions become rare, at times it's become almost dormant, however, as with all geysers, it's eruptions are strongly related to local earthquake activity.
Eruptions have been forced, in 1935 a man made channel was dug through the silica rim around the edge of the geyser vent, in 1981 the ditch was cleared again and eruptions have been stimulated by adding soap, however not being environmentally friendly this particular practice is no longer used.
Uploaded: Jan 4, 2016
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