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The Tristan da Cunha |
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tristandc.com/ index / history / history 1961-3 |
History : Volcanic Interlude |
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The earth moves Active volcanic islands can seem very benign as the time-scale between eruptions can span centuries. To a modern geologist, the tell-tale signs were there for all to see on the island of Tristan da Cunha . A classic pyramidal shape with a symmetric summit crater, a recent lava flow at Stony Hill not yet covered by vegetation, and everywhere evidence of hundreds of previous dark grey lava flows sandwiched between layers of fragile ash, often looking like Aero chocolate. But there had been no recorded volcanic activity during human history. The eruption started as magma pushed upwards and caused earthquakes which produced landslides directly behind the settlement during August and September 1961. On 8 th October a large earthquake and landslide particularly affected the eastern settlement where families moved overnight to the homes of relatives in the quieter western district. The following morning saw a fissure open between the Settlement and the canning factory where the ground rose. At a hastily organised meeting in the Hall, convened by Administrator Peter Wheeler, it was agreed to evacuate all the 264 islanders and 26 expatriates to huts at the Potato Patches overnight. |
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Escape from eruption |
| The eruption pictured in October 1961 before lava flows destroyed the canning factory (left) and Big Beach. | |
UK Sojourn |
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Published by the Tristan da Cunha Government and the Tristan da Cunha Association. Copyright © 2007 and all Rights Reserved. This page first published May 2005 |