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Mount Aniakchak and Ugashik Bay, Alaska, USA

57.5N 157.6W

September 17th, 2009 Category: Rivers, Volcanoes

Alaska, USA - August 30th, 2009

Alaska, USA - August 30th, 2009

This orthorectified image stretches from Ugashik Bay (above) to the 10km wide caldera of Mount Aniakchak (below). The volcano is located in the Aleutian Range of Alaska, USA, visible along the eastern coast here.

Ugashik Bay is a bay of the Bering Sea in Alaska. It is an elongated, comma-shaped estuary formed where the Ugashik River empties into Bristol Bay, on the western coast of the Alaska Peninsula.

Its waters are characteristically turbid and turbulent, the result of muddy feeder streams, frequent winds, and very high tides. Some Bristol Bay tides are thought to rank eighth highest in the world, and Ugashik Bay is greatly influenced by this tidal action.

The bay is bordered on the north by a sand beach stretching from Smoky Point on the west to the wide mouth of Dago Creek, on the east by a mud-and-sand shoreline running nearly true north-south past the village of Pilot Point to Muddy Point.

The southern shore is a shifting series of mud-and-sand ridges, the northernmost and most prominent of which is called South Spit.

Mount Aniakchak in Alaska’s Aleutian Range, USA

56.9N 158.1W

August 30th, 2009 Category: Volcanoes

Alaska, USA - July 28th, 2009

Alaska, USA - July 28th, 2009

Mount Aniakchak is a 3,400 year old volcanic caldera located in the Aleutian Range of Alaska, USA. It has a diameter of about 10 kilometres (6 miles). Within the caldera are several examples of lava flows and cinder cones, as well as a body of water known as Surprise Lake.

The area around the volcano is the Aniakchak National Monument and Preserve, all of which is part of the Pacific Ring of Fire. The caldera itself and the surrounding area can be observed free of geometric distortion as the image has been orthorectified.

Mount Aniakchak and Mount Veniaminof, Alaska – February 20th, 2009

February 20th, 2009 Category: Image of the day, Volcanoes

Alaska - February 17th, 2009

Alaska - February 17th, 2009

Two snow-covered volcanoes, Mount Aniakchak and Mount Veniaminof, are located in the Aleutian Rangeon on this Alaskan peninsula, USA, between the Bering Sea (left) and the Gulf of Alaska (right).

Mount Aniakchak, visible just north of the image center, is a 3,400 year old volcanic caldera (about 10 kilometres [6 mi] in diameter).

It is an extant volcano – at least ten lava flows have occurred since the formation of the caldera; the most recent was in 1931.

Surprise Lake, within the caldera, is the source of the Aniakchak River, a National Wild River. The area around the volcano is the Aniakchak National Monument and Preserve.

To the southwest, Mount Veniaminof is an active stratovolcano located on the Alaska Peninsula. The Alaska Volcano Observatory currently rates Veniaminof as Aviation Color Code Green and Volcano Alert Level Normal.

In modern times the volcano has had numerous small eruptions (over ten of them since 1930); these are located at a cinder cone in the middle of the caldera.

Veniaminof has one of the highest elevations of Alaskan volcanoes. Partly for this reason, it is covered by a glacier that fills most of its large caldera.

Due to the glacier and the caldera walls, there is the possibility for a major flood from a glacier run at some point in the future.

Mount Veniaminof on the Alaska Peninsula, USA

August 3rd, 2009 Category: Volcanoes

Alaska, USA - July 15th, 2009

Alaska, USA - July 15th, 2009

Mount Veniaminof, visible on the right side of this orthorectified image, is an active stratovolcano with a large caldera located on the Alaska Peninsula. This broad, central mountain is 35 km wide at its base; the steep-walled summit caldera is 8×11 km in diameter.

Most of this caldera is filled by an ice field that ranges in elevation from approximately 1750 to 2000 m. Ice also coats the south rim of the caldera and covers 220 square km of the south flank of the volcano. Alpine glaciers descend from the caldera through gaps on the west and north sides of the rim and other alpine glaciers occupy valleys on the north-, east-, and west-facing slopes of the mountain.

In the western part of the caldera, an active intracaldera cone with a small summit crater has an elevation of 2156 m, approximately 330 m above the surrounding ice field. The eruptions that have occurred in modern times have come from this cone, posing a flood threat if such an eruption were to cause the glacier to melt.