Images

Surface faulting split this tree near the Trans Alaska Pipeline.

View south along the Trans Alaska Pipeline in the zone where it was engineered for the Denali fault. The fault trace passes beneath the pipeline between the 2nd and 3rd slider supports at the far end of the zone. A large arc in the pipe can be seen in the pipe on the right, due to shortening of the zigzag-shaped pipeline trace within the fault zone.

View of central Alaska Range from the south.

Portage Glacier (right), Burns Glacier (center), Shakespeare Glacier (left) in Southcentral Alaska from the air.

After beginning in northern British Columbia and flowing through Yukon in Canada, the Yukon River crosses Alaska, USA, before emptying into the Bering Sea. Countless lakes, sloughs, and ponds are scattered throughout this scene of the Yukon Delta. The river's sinuous, branching waterways seem like blood vessels branching out to enclose an organ.

A sunset seen from Kaktovik, Alaska

Jason Baker and Scott McLean pulling a beach seine in a side channel of the Yukon River

As air flows over and around objects in its path, spiraling eddies, known as Von Karman vortices, may form. The vortices in this image were created when prevailing winds sweeping east across the northern Pacific Ocean encountered Alaska's Aleutian Islands.

Alaska mountain range.

Alaska mountain range.

Scenic view of Alaskan lake and mountains.

The eastern side of Russia's Kamchatka Peninsula juts into the Pacific Ocean west of Alaska. In this winter image, a volcanic terrain is hidden under snow-covered peaks and valley glaciers feed blue ice into coastal waters.

View southward from Fortress Mountain Formation on Atigun syncline towards Brooks Range.  Trans-Alaska Pipeline, haul road, and Galbraith Lake in valley.  Location in Brooks Range foothills, about 90 miles southeast of Umiat.

Polar bear mother and two cubs on the Beaufort Sea ice.

The tongue of the Malaspina Glacier, the largest glacier in Alaska, fills most of this image. The Malaspina lies west of Yakutat Bay and covers 1,500 sq mi (3,880 sq km).

These cloud formations were seen over the western Aleutian Islands. Their color variations are probably due to differences in temperature and in the size of water droplets that make up the clouds.

Looking upstream from mid channel of the John Wild River. Near Anaktuvuk, Alaska.

A polar bear den

An intricate maze of small lakes and waterways define the Yukon Delta at the confluence of Alaska's Yukon and Kuskokwim Rivers with the frigid Bering Sea. Wildlife abounds on the delta and offshore where sheets of sea ice form during the coldest months of the year.

View southeast from Overlook Cabin looking over the Valley of Ten Thousand Smokes. The pyroclastic and ash deposits that fill the valley remain nearly vegetation-free more than 100 years after the 1912 Novarupta-Katmai eruption.

Tule white-fronted goose in the Kahiltna Valley, Alaska, in 1984.