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ATLANTIS & the Atlantic Ocean


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Author Topic: ATLANTIS & the Atlantic Ocean  (Read 22104 times)
dhill757
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« Reply #345 on: March 30, 2009, 12:03:54 am »



   Graciosa 

The small 4 x 8 km island of Graciosa is seen in this NASA Space Shuttle image with north to the upper left. Cloud banks partially obscure the SE end of the island, which contains a small 0.9 x 1.6 km caldera with active fumaroles. Scoria cones are found over much of the island, and several widely spaced NE-SW-trending fissures fed a youthful lava field that forms the NW end of the island.

NASA Space Shuttle image ISS004-E-10893, 2002 (http://eol.jsc.nasa.gov/).


 Country: Portugal
Subregion Name: Azores and Madeira
Volcano Number: 1802-04=
Volcano Type: Stratovolcano
Volcano Status: Holocene
Last Known Eruption: Unknown
Summit Elevation: 402 m 1,319 feet
Latitude: 39.02°N  39°1'0"N
Longitude: 27.97°W 27°58'0"W
The SE end of Graciosa, the northernmost of the central Azorean islands, contains a small 0.9 x 1.6 km caldera with active fumaroles. The 402-m-high SE caldera rim is the high point of the small 4 x 8 km island. The caldera has been the source of eruptions producing significant tephra falls, pyroclastic flows, lahars, and lava flows. An important fumarole field is located in a volcanic cave inside the caldera, and a submarine fumarole occurs off the NW coast of Graciosa. Scoria cones erupted along several widely spaced NE-SW-trending fissures fed a youthful lava field that forms the NW end of the island. The most recent eruption from Pico Tomao, NW of the caldera, produced a lava flow that reached the eastern coast NW of the village of Praia. 
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