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Author Topic: Surtsey  (Read 2678 times)
Adam Hawthorne
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Posts: 4250

« on: April 14, 2007, 05:19:08 pm »

The eruption vents today

The eruption gradually dies down
In 1965 the activity on the main island diminished, but at the end of May that year an eruption began at a vent 0.6 km off the northern shore. By 28 May an island had appeared, and was named Syrtlingur. Eruptions at Syrtlingur continued until the beginning of October 1965, by which time the islet had an area of 0.15 km▓, but it was rapidly eroded away once the eruptions had ceased, disappearing beneath the waves on 24 October.

During December 1965, more submarine activity occurred 0.9 km south-west of Surtsey, and another island was formed. It was named Jˇlnir, and over the following eight months it grew to 70 m in height, covering 0.3 km▓. Like Syrtlingur, though, after activity ceased on 8 August 1966, it was rapidly eroded, and dropped below sea level during October 1966.

19 August 1966 saw the return of effusive eruptions on the main island, giving it further resistance to erosion. The eruption rate diminished steadily though, and on 5 June 1967, the eruption ended. The volcano has been dormant ever since. The total volume of lava emitted during the three-and-a-half-year eruption was about one cubic kilometre, and the island's highest point was 174 metres above sea level.

Since the end of the eruption, erosion has seen the island diminish in size. A large area on the south-east side has been eroded away completely, while a sand spit called Nor­urtangi (north point) has grown on the north side of the island. It is estimated that about 0.024 km│ of material has been lost due to erosion ľ this represents about a quarter of the original above sea level volume of the island.[2]

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