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ATLANTIS & the Atlantic Ocean


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dhill757
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« Reply #345 on: March 30, 2009, 12:02:31 am »



   
 Fayal

 Country: Portugal
Subregion Name: Azores and Madeira
Volcano Number: 1802-01=
Volcano Type: Stratovolcano
Volcano Status: Historical
Last Known Eruption: 1958   
Summit Elevation: 1043 m 3,422 feet
Latitude: 38.60°N  38°36'0"N
Longitude: 28.73°W 28°44'0"W
The island of Fayal, also spelled Faial, is the nearest of the central Azorean islands to the Mid-Atlantic Ridge. The island is composed of a complex large andesitic-to-trachytic stratovolcano that contains a 2-km-wide summit caldera. Thick deposits of trachytic airfall pumice, pyroclastic flows, and lahars related to formation of the caldera blanket the island. Formation of the steep-walled 500-m-deep caldera was followed by construction of fissure-fed basaltic lava fields and small volcanoes that form a peninsula extending to the west. This area is covered by the youngest volcanic products on the island and has been the source of all historical eruptions. A dramatic submarine eruption at Capelinhos during 1957-58, the best-studied of historical eruptions in the Azores, created a new island that soon merged with the western peninsula. 


Fayal volcano is capped by a 2-km-wide, 500-m-deep summit caldera, seen from its southern rim. A small pyroclastic cone was constructed on the floor of the caldera. Thick airfall-pumice and pyroclastic-flow deposits related to formation of the caldera blanket the island. This event was followed by construction of fissure-fed lava fields and small volcanoes that formed a peninsula extending to the west. A dramatic submarine eruption at Capelinhos during 1957-58 created a new island that soon merged with the western peninsula.

Photo by Rick Wunderman, 1997 (Smithsonian Institution).

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