[Source]
Geysir, sometimes known as The Great Geysir, is a geyser in southwestern Iceland. The research of sinter shows that Geysir has been active for approximately 10,000 years. History of recent centuries shows that earthquakes have tended to revive the activity of Geysir which then subsides again in the following years. Before 1896, Geysir was almost dormant before an earthquake that year caused eruptions to begin again, occurring several times a day, lasting up to an hour and causing spouts of up to 60 metres in height. In 1910, 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 all but ceased. [Wiki]
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