Tectonic Boundary Between the North American and Eurasian Plates

The geology of Silfra and the ├×ingvellir valley are connected to the tectonic drift of the Eurasian and the North American plates. Every year, the plates drift about 2 cm apart, which builds up tension between the plates and the earth mass above. This tension is released through a major earthquake approximately every ten years. In these earthquakes, cracks and fissures are formed in ├×ingvellir. Silfra is one of the largest cracks and started with a deep cave where most of the underwater wells nourish it.

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