Surtsey ("Surtr's island" in Icelandic, ) is a volcanic island located in the Vestmannaeyjar archipelago off the southern coast of Iceland. At Surtsey is the southernmost point of Iceland. It was formed in a volcanic eruption which began below sea level, and reached the surface on 14 November 1963. The eruption lasted until 5 June 1967, when the island reached its maximum size of . Since then, wave erosion has caused the island to steadily diminish in size: , its surface area was . The most recent survey (2007) shows the island's maximum elevation at above sea level. The new island was named after Surtr, a fire jötunn or giant from Norse mythology. It was intensively studied by volcanologists during its eruption, and afterwards by botanists and other biologists as life forms gradually colonised the originally barren island. The undersea vents that produced Surtsey are part of the Vestmannaeyjar submarine volcanic system, part of the fissure of the sea floor called the Mid-Atlantic Ridge. Vestmannaeyjar also produced the famous eruption of Eldfell on the island of Heimaey in 1973. The eruption that created Surtsey also created a few other small islands along this volcanic chain, such as Jólnir and other, unnamed peaks. Most of these eroded away fairly quickly. It is estimated that Surtsey will remain above sea level until at least the year 2100. Geology Formation The eruption was unexpected, and almost certainly began some days before it became apparent at the surface. The sea floor at the eruption site is below sea level, and at this depth volcanic emissions and explosions would be suppressed, quenched and dissipated by the water pressure and density. Gradually, as repeated flows built up a mound of material that approached sea level, the explosions could no longer be contained, and activity broke the surface. The first noticeable indications of volcanic activity were recorded at the seismic station in Kirkjubæjarklaustur, Iceland from 6 to 8 November 1963, which detected weak tremors emanating from an epicentre approximately west-south-west at a distance of , the location of Surtsey. Another station in Reykjavík recorded even weaker tremors for ten hours on 12 November at an undetermined location, when seismic activity ceased until 21 November. That same day, people in the coastal town of Vík away noticed a smell of hydrogen sulphide. On 13 November, a fishing vessel in search of herring, equipped with sensitive thermometers, noted sea