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Posts tagged Mount Okmok

Mount Okmok and Okmok Caldera, in Alaska, USA

53.4N 168.1W

February 14th, 2010 Category: Mountains, Volcanoes

USA - February 4th, 2010

USA - February 4th, 2010

This orthorectified image shows the wide, circular Okmok Caldera, which truncates the top of a large shield volcano. The highest point on the caldera rim is  called Mount Okmok. Both are located in the northeastern part of Umnak Island in the eastern Aleutian Islands of Alaska, USA.

Although the last major eruptions of Okmok—with an estimated VEI strength of 6—occurred 8,300 and 2,400 years ago, on Saturday, July 12, 2008, Okmok Caldera exploded without warning, sending a plume of ash over 33,000 feet (10,000 m) into the air. No lava flow was reported, though the volcano has issued flows in the past.

Before then, the volcano had last erupteded in 1997 and produced a lava flow, once again erupting with no initial warnings. Residents of Fort Glenn, a nearby ranch, fled from falling ash and volcanic rock.

Shield and Strato-Volcanoes of Umnak Island, USA

53.1N 168.5W

December 9th, 2009 Category: Volcanoes

Alaska, USA - November 10th, 2009

Alaska, USA - November 10th, 2009

Volcanoes with distinctive shapes can be observed on Umnak Island, one of the Aleutian Islands that are part of the state of Alaska, USA, in this orthorectified image. The northern end of the island is mostly occupied by the circular volcanic caldera of Mount Okmok.

The southern end of the island is home to the steep symmetrical cone of Mount Vsevidof  and the heavily eroded Mount Recheshnoi (right of the former).

Both Mount Vsevidof and Mount Recheshnoi are stratovolcanoes, while Mount Okmok is a shield volcano. The summit of Mount Vsevidof is the highest point on Umnak Island at 7051 ft (2149 m), while its neighbor Mount Recheshnoi is lower, due in part to erosion, with a maximum elevation of 6,509 feet (1984 m). Returning to the north end of the island, Mount Okmok itself, near the caldera rim, is much lower than its southern-end counterparts, with a height of 3,520 feet (1073 m).

The Caldera of the Okmok Volcano, Alaska, USA

53.4N 168.1W

November 3rd, 2009 Category: Volcanoes

Alaska, USA - October 22nd, 2009

Alaska, USA - October 22nd, 2009

The circular caldera of Mount Okmok occupies much of Umnak Island, one of Alaska’s Aleutian Islands in the USA.  The caldera is 5.8 mile (9.3 km) wide, cutting across the top of a large shield volcano.

The caldera rim can be observed in detail in this orthorectified image. Of particular interest are an eroded section through which the lake that once filled the caldera drained, visible around the 12 o’clock position, and Mount Okmok itself, the highest point of the volcano at over 3400 feet, visible around 10 o’clock.

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.

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