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1755 Lisbon earthquake

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Illyria
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« on: June 30, 2009, 01:15:08 pm »

Shocks from the earthquake were felt throughout Europe as far as Finland and North Africa, and according to some sources even in Greenland[4] and in the Carribean[5]. Tsunamis as tall as 20 metres (66 ft) swept the coast of North Africa, and struck Martinique and Barbados across the Atlantic. A three-metre (ten-foot) tsunami hit Cornwall on the southern English coast. Galway, on the west coast of Ireland, was also hit, resulting in partial destruction of the "Spanish Arch" section of the city wall.

Although seismologists and geologists had always agreed that the epicenter was in the Atlantic to the West of the Iberian peninsula, its exact location has been a subject of considerable debate. Early theories had propsed the Gorringe Ridge until simulations showed that a source closer to the shore of Portugal was required to comply with the observed effects of the tsunami. A seismic reflection survey of the ocean floor along the Azores-Gibraltar fault has revealed a 50 km-long thrust structure Southwest of Cape St. Vincent, with a dip-slip throw of more than 1 km, that might have been created by the primary tectonic event.[6]

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