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Volcanoes of Umnak Island, Alaska, USA

53.4N 168.1W

September 7th, 2009 Category: Volcanoes

Alaska, USA - July 28th, 2009

Alaska, USA - July 28th, 2009

Umnak Island, part of the Aleutian Islands in Alaska, USA, is visible here in its entirety, from Mount Okmok in the upper right quadrant to its thin southwestern tip towards the bottom edge of this orthorectified image.

The wide, circular caldera of the Mount Okmok volcano can be seen in great detail. Of note is an eroded segment of the rim on the northeast side, through which the lake that used to fill the cadera drained.

Southwest of Mount Okmok, on the southern lobe of the island, are Mount Recheshnoi  (right) and Mount Vsevido (left).

Vsevidof and Recheshnoi Volcanoes, Alaska, USA

53.1N 168.6W

August 21st, 2009 Category: Volcanoes

USA - July 1st, 2009

USA - July 1st, 2009

Umnak is one of the Fox Islands of the Aleutian Islands, part of Alaska, USA. With 686.01 square miles (1,776.76 km2) of land area, it is the third largest island in the Aleutian archipelago and the 19th largest island in the United States.

The island is home to several volcanoes: Mount Okmok (with a large volcanic caldera, right edge), Mount Vsevidof (white cone, center) and Mount Recheshnoi (right of the former).

Mount Vsevidof is a stratovolcano whose summit is the highest point on Umnak Island. Its symmetrical cone rises abruptly from its surroundings.

Mount Recheshnoi, on the other hand, is a heavily eroded stratovolcano. It is notable for its northeast flank, which has one of the hottest and most extensive thermal areas in Alaska.

This image has been orthorectified. Please click here to see other such images.