Unified Interior Regions

Alaska

The Alaska Region represents a resource-rich, dynamic landscape shaped by volcanos, earthquakes, major rivers, and glaciers. Here, we conduct research to inform management of Alaska’s extensive natural resources, inform national Arctic energy policy, and provide scientific information to help others understand, respond to, and mitigate impacts from natural hazards.

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Filter Total Items: 203
Date published: April 17, 2018
Status: Active

Sockeye Salmon Migrating at the Northern Edge of Their Distribution

The physiological challenge for anadromous fish to migrate upriver to spawn and complete their life cycle is influenced by river temperature.

Contacts: Michael P Carey, Ph.D., Stephen D McCormick, Amy Regish, Christian E Zimmerman, Ph.D., Kevin D. Keith, Merlyn Schelske, Charlie Lean
Date published: April 16, 2018
Status: Active

Nearshore Fish Surveys in the Beaufort Sea

Nearshore systems provide habitat to a unique community of marine and diadromous (lives in both fresh and saltwater) fish and support high fish abundance.

Date published: April 11, 2018
Status: Active

Development and Validation of Hyperspectral Imager for Field and Lab Scanning

The Mineral Resources Program has advanced methods of imaging spectroscopy (hyperspectral remote sensing) that are now used routinely by the earth science and remote sensing communities for mineral mapping, soil quality mapping, hazard mitigation, and other terrestrial and planetary applications. The USGS is highly qualified to advance this technology based on its world class expertise in...

Contacts: Raymond Kokaly
Date published: April 3, 2018
Status: Active

Assessing heat stress in migrating Yukon River Chinook Salmon

We will examine evidence of heat stress in Yukon River Chinook salmon (Oncorhynchus tshawytscha) using heat shock proteins and gene expression.

Date published: March 13, 2018
Status: Active

Alaska Technical Data Unit - Field Records Archives

This project is designed to collect, inventory, preserve, and make available the records of USGS geologic and minerals work in Alaska. Materials are organized in two broad categories of records: (1) Project History files, which contain field notes, maps, and fossil reports; and (2) Geologic Subject files, containing unpublished materials, correspondence, and the Economic Minerals files. Access...

Date published: March 2, 2018
Status: Active

Media/Outreach at the Alaska Science Center

If you have questions about upcoming events, research, or media inquiries regarding the USGS Alaska Science Center please contact Yvette Gillies, Paul Laustsen or Steven Sobieszczyk.

Date published: March 2, 2018
Status: Active

Wind - Habitat Dynamics

Several species of shorebird that nest in the Arctic make remarkable non-stop trans-oceanic migrations to non-breeding areas in the southern hemisphere. Scientists at the USGS Alaska Science Center have discovered many fascinating and previously unknown details about these long-distance migrations by instrumenting individual birds with Argos satellite transmitters (see ASC Shorebird Research...

Contacts: David Douglas
Date published: March 1, 2018
Status: Active

Vegetation Phenology - Habitat Dynamics

Vegetation Phenology

Contacts: David Douglas
Date published: March 1, 2018
Status: Active

Sea Ice - Habitat Dynamics

Sea Ice Present, Future and Ice Loss and Wildlife

Contacts: David Douglas
Date published: February 27, 2018
Status: Active

Fish and Aquatic Ecology

Fish and aquatic habitats in Alaska support important commercial, sport, and subsistence fisheries and provide forage fish that support wildlife populations.  The USGS Alaska Science Center conducts interdisciplinary research to inform local, state, federal, and international policy makers regarding conservation of fish, aquatic species, and their habitats.  We work collaboratively with...

Date published: January 19, 2018
Status: Active

Research Conducted in the Arctic National Wildlife Refuge (ANWR) Coastal Plain (1002 Area)

Selected Bibliography of Research Involving USGS and Conducted in the Arctic National Wildlife Refuge (ANWR) Coastal Plain (1002 Area)

Compiled as of 12/17/2018

Date published: January 19, 2018
Status: Active

Research Conducted in the National Petroleum Reserve – Alaska (NPRA)

Selected Bibliography of Research Involving USGS and Conducted in the National Petroleum Reserve – Alaska (NPR-A)

Compiled as of 12/17/2018

Filter Total Items: 189
Date published: January 1, 2019

Elevation point clouds of the north coast of Barter Island, Alaska acquired July 01 2014, September 07 2014, and July 05 2015 (LAZ file)

Six elevation point cloud files in LAZ format (compressed LAS binary data) are included in this data release: 3 raw point clouds of unclassified and unedited points and 3 modified point clouds that were spatially shifted and edited to remove outliers and spurious elevation values associated with moving water surfaces. An XYZ coordinate shift was applied to each data set in order to register...

Date published: January 1, 2019

Surveyed ground control and elevation checkpoints acquired at Barter Island, Alaska, 2014-2016

Ground control points and checkpoints were collected during Global Positioning System (GPS) surveys conducted between September 6, 2014 and September 18, 2016 along the northern coast of Barter Island, Alaska. Data were acquired and post-processed using precise positioning and used to co-register and assess accuracy of photogrammetric data sets.

Date published: January 1, 2019

High-resolution acoustic backscatter data collected southwest of Montague Island, Alaska during field activity 2014-622-FA

High-resolution acoustic backscatter data were collected by the U.S. Geological Survey (USGS) and the Alaska Department of Fish and Game in May of 2014 southwest of Montague Island, Alaska. Data were collected aboard the Alaska Department of Fish and Game vessel, R/V Solstice, during USGS field activity 2014-622-FA, using a pole mounted 100-kHz Reson 7111 multibeam echosounder.

Date published: January 1, 2019

Orthophotomosaic images (natural color) of the north coast of Barter Island, Alaska acquired on July 05 2015 (GeoTIFF image; 8-cm resolution)

Aerial photographs were collected from a small, fixed-wing aircraft over the coast of Barter Island, Alaska on July 05 2015. Precise aircraft position information and structure-from-motion photogrammetric methods were combined to a derive high-resolution orthophotomosaic. This orthophotomosaic contain 3-band, 8-bit, unsigned raster data (red/green/blue; file format-GeoTIFF) with

Date published: January 1, 2019

Orthophotomosaic image (natural color) of the north coast of Barter Island, Alaska acquired on July 01 2014 (GeoTIFF image, 19-cm resolution)

Aerial photographs were collected from a small, fixed-wing aircraft over the coast of Barter Island, Alaska on July 01 2014, September 07 2014. Precise aircraft position information and structure-from-motion photogrammetric methods were combined to derive a high-resolution orthophotomosaic. This orthophotomosaic contain 3-band, 8-bit, unsigned raster data (red/green/blue; file f

Date published: December 19, 2018

Serological Data on Influenza A from Birds and Mammals on the Arctic Coastal Plain of Northern Alaska, 2011-2017

These data (in two spreadsheets) are the results of screening for influenza A viruses (IAV) in blood from wild animals that utilize the Arctic region of Alaska. 758 blood samples from nine wildlife species (3 mammal, 6 waterbird) were collected in Arctic Alaska, 2011-2017. Two different tests were used and the results are presented in separate spreadsheets. All blood samples were

Date published: December 17, 2018

Downloadable Data for Southern Alaska Oil and Gas Assessments

GIS Data for Southern Alaska Oil and Gas Assessments

Date published: December 17, 2018

Downloadable Data for Central Alaska Oil and Gas Assessments

GIS Data for Central Alaska Oil and Gas Assessments 

Date published: November 20, 2018

Downloadable Data for Northern Alaska Oil and Gas Assessments

Follow this link to access downloadable GIS and tabular data for this province.

Date published: November 15, 2018

Influenza A Virus Data from Migratory Birds, Izembek National Wildlife Refuge, Alaska

Data set containing avian influenza sampling information for late summer and early autumn waterfowl and gulls within and around the Izembek National Wildlife Refuge (NWR), Alaska, 2011-2016. Data contains species, age, sex, collection data and location of sampled migratory birds. Laboratory specific data used to identify presence and absence of influenza A viruses (IAVs) from c

Date published: November 15, 2018

Gulf Watch Alaska Nearshore Component: Intertidal Soft-Sediment Invertebrates from Prince William Sound, Katmai National Park and Preserve, and Kenai Fjords National Park, 2007-2015

These data are part of the Gulf Watch Alaska (GWA) long term monitoring program, nearshore monitoring component. The data consists of species identification, counts, and size measurements from intertidal soft-sediment sampling sites. Observers excavated, identified, and measured invertebrates from soft sediment sites. Sites are in Alaska and include locations in Katmai National Park

Date published: November 14, 2018

U-Pb Isotopic Data and Ages of Detrital Zircon Grains and Graptolite Fossil Data from Selected Rocks from the Western Alaska Range, Livengood area, and Seward Peninsula, Alaska - 2018

This data set contains two data sets. One data set is of U-Pb isotopic data
and associated ages of detrital zircon grains from 16 sedimentary and
metasedimentary rocks from the western Alaska Range, Livengood area and
Seward Peninsula, Alaska. Two samples were collected from the York Mountains
area of the Seward Peninsula of western Alaska. Three samples were collected...

Filter Total Items: 135
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Year Published: 1967

The Alaska earthquake, March 27, 1964: effects on transportation, communications, and utilities

This is the forth in a series of six reports that the U.S. Geological Survey published on the results of a comprehensive geologic study that began, as a reconnaissance survey, within 24 hours after the March 27, 1964, Magnitude 9.2 Great Alaska Earthquake and extended, as detailed investigations, through several field seasons. The 1964 Great...

Logan, Malcolm H.; Burton, Lynn R.; Eckel, Edwin B.; Kachadoorian, Reuben; McCulloch, David S.; Bonilla, Manuel G.
The Alaska earthquake, March 27, 1964: effects on transportation, communications, and utilities; 1967; PP; 545; Logan, Malcolm H.; Burton, Lynn R.; Eckel, Edwin, B.; Kachadoorian, Reuben; McCulloch, David S.; Bonilla, Manuel G.

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Year Published: 1966

The Alaska earthquake, March 27, 1964: effects on hydrologic regimen

This is the fourth in a series of six reports that the U.S. Geological Survey published on the results of a comprehensive geologic study that began, as a reconnaissance survey, within 24 hours after the March 27, 1964, Magnitude 9.2 Great Alaska Earthquake and extended, as detailed investigations, through several field seasons. The 1964 Great...

Waller, Roger M.; Coble, R.W.; Post, Austin; McGarr, Arthur; Vorhis, Robert C.
The Alaska earthquake, March 27, 1964: effects on hydrologic regimen; 1966; PP; 544; Waller, Roger M.; Coble, R. W.; Post, Austin; McGarr, Arthur; Vorhis, Robert C.

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Year Published: 1966

Effects of the March 1964 Alaska earthquake on the hydrology of south-central Alaska: Chapter A in The Alaska earthquake, March 27, 1964: effects on hydrologic regimen

The earthquake of March 27, 1964, greatly affected the hydrology of Alaska and many other parts of the world. Its far-reaching effects were recorded as water-level fluctuations in gages operated on water wells and streams. The close-in effects were even more striking, however; sediment-laden ground water erupted at the surface, and even ice-...

Waller, Roger M.
Effects of the March 1964 Alaska earthquake on the hydrology of south-central Alaska: Chapter A in The Alaska earthquake, March 27, 1964: effects on hydrologic regimen; 1966; PP; 544-A; The Alaska earthquake, March 27, 1964: effects on the hydrologic regimen (Professional Paper 544); Waller, Roger M.

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Year Published: 1966

Effects of the March 1964 Alaska earthquake on the hydrology of the Anchorage area, Alaska: Chapter B in The Alaska earthquake, March 27, 1964: effects hydrologic regimen

The Anchorage hydrologic system was greatly affected by the seismic shock. Immediate but temporary effects included increased stream discharge, seiche action on lakes, and fluctuations in ground-water levels. Generally, ground-water levels were residually lowered after the initial period of fluctuation. This lowering is attributed either to...

Waller, Roger M.
Effects of the March 1964 Alaska earthquake on the hydrology of the Anchorage area, Alaska: Chapter B in The Alaska earthquake, March 27, 1964: effects hydrologic regimen; 1966; PP; 544-B; The Alaska earthquake, March 27, 1964 :effects on the hydrologic regimen (Professional Paper 544); Waller, Roger M.

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Year Published: 1966

Effects of the earthquake of March 27, 1964 in the Copper River Basin area, Alaska: Chapter E in The Alaska earthquake, March 27, 1964: regional effects

The Copper River Basin area is in south-central Alaska and covers 17,800 square miles. It includes most of the Copper River Basin and parts of the surrounding Alaska Range and the Talkeetna, Chugach, and Wrangell Mountains. On March 27, 1964, shortly after 5:36 p.m. Alaska standard time, a great earthquake having a Richter magnitude of about 8.5...

Ferrians, Oscar J.
Effects of the earthquake of March 27, 1964 in the Copper River Basin area, Alaska: Chapter E in The Alaska earthquake, March 27, 1964: regional effects; 1966; PP; 543-E; The Alaska earthquake, March 27, 1964: regional effects (Professional Paper 543); Ferrians, Oscar J., Jr.

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Year Published: 1966

Effects of the earthquake of March 27, 1964, at Valdez, Alaska: Chapter C in The Alaska earthquake, March 27, 1964: effects on communities

Valdez is situated on the seaward edge of a large outwash delta composed of a thick section of saturated silty sand and gravel. The earthquake of March 27, 1964, triggered a massive submarine slide, involving approximately 98 million cubic yards of material that destroyed the harbor facilities and nearshore installations. Waves generated by the...

Coulter, Henry Welty; Migliaccio, Ralph R.
Effects of the earthquake of March 27, 1964, at Valdez, Alaska: Chapter C in The Alaska earthquake, March 27, 1964: effects on communities; 1966; PP; 542-C; The Alaska earthquake, March 27, 1964: effects on communities (Professional Paper 542); Coulter, Henry Welty; Migliaccio, Ralph R.

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Year Published: 1966

Effects of the earthquake of March 27, 1964, in the Homer area, Alaska, with a section on beach changes on Homer Spit: Chapter D in The Alaska earthquake, March 27, 1964: effects on communities

The March 27, 1964, earthquake shook the Homer area for about 3 minutes. Land effects consisted of a 2- to 6-foot subsidence of the mainland and Homer Spit, one earthflow at the mouth of a canyon, several landslides on the Homer escarpment and along the sea bluffs, and minor fissuring of the ground, principally at the edges of bluffs and on Homer...

Waller, Roger M.; Stanley, Kirk W.
Effects of the earthquake of March 27, 1964, in the Homer area, Alaska, with a section on beach changes on Homer Spit: Chapter D in The Alaska earthquake, March 27, 1964: effects on communities; 1966; PP; 542-D; The Alaska earthquake, March 27, 1964: effects on communities (Professional Paper 542); Waller, Roger M.; Stanley, Kirk W.

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Year Published: 1966

Geologic effects of the March 1964 earthquake and associated seismic sea waves on Kodiak and nearby islands, Alaska: Chapter D in The Alaska earthquake, March 27, 1964: regional effects

Kodiak Island and the nearby islands constitute a mountainous landmass with an aggregate area of 4,900 square miles that lies at the western border of the Gulf of Alaska and from 20 to 40 miles off the Alaskan mainland. Igneous and metamorphic rocks underlie most of the area except for a narrow belt of moderately to poorly indurated rocks...

Plafker, George; Kachadoorian, Reuben
Geologic effects of the March 1964 earthquake and associated seismic sea waves on Kodiak and nearby islands, Alaska: Chapter D in The Alaska earthquake, March 27, 1964: regional effects; 1966; PP; 543-D; The Alaska earthquake, March 27, 1964: regional effects (Professional Paper 543); Plafker, George; Kachadoorian, Reuben

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Year Published: 1966

Geomorphic effects of the earthquake of March 27, 1964, in the Martin-Bering Rivers area, Alaska: Chapter B in The Alaska earthquake, March 27, 1964: regional effects

The Alaska earthquake of March 27, 1964, caused widespread geomorphic changes in the Martin-Bering Rivers area-900 square miles of uninhabited mountains, alluvial flatlands, and marshes north of the Gulf of Alaska, and east of the Copper River. This area is at lat 60°30’ N. and long 144°22’ W., 32 miles east of Cordova, and approximately 130 miles...

Tuthill, Samuel J.; Laird, Wilson M.
Geomorphic effects of the earthquake of March 27, 1964, in the Martin-Bering Rivers area, Alaska: Chapter B in The Alaska earthquake, March 27, 1964: regional effects; 1966; PP; 543-B; The Alaska earthquake, March 27, 1964: regional effects (Professional Paper 543); Tuthill, Samuel J.; Laird, Wilson M.

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Year Published: 1966

Gravity survey and regional geology of the Prince William Sound epicentral region, Alaska: Chapter C in The Alaska earthquake, March 27, 1964: regional effects

Sedimentary and volcanic rocks of Mesozoic and early Tertiary age form a roughly arcuate pattern in and around Prince William Sound, the epicentral region of the Alaska earthquake of 1964. These rocks include the Valdez Group, a predominantly slate and graywacke sequence of Jurassic and Cretaceous age, and the Orca Group, a younger sequence of...

Case, J.E.; Barnes, D.F.; Plafker, George; Robbins, S.L.
Gravity survey and regional geology of the Prince William Sound epicentral region, Alaska: Chapter C in The Alaska earthquake, March 27, 1964: regional effects; 1966; PP; 543-C; The Alaska earthquake, March 27, 1964: regional effects (Professional Paper 543); Case, J. E.; Barnes, D. F.; Plafker, George; Robbins, S. L.

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Year Published: 1966

Slide-induced waves, seiching and ground fracturing caused by the earthquake of March 27, 1964 at Kenai Lake, Alaska: Chapter A in The Alaska earthquake, March 27, 1964: regional effects

The March 27, 1964, earthquake dislodged slides from nine deltas in Kenai Lake, south-central Alaska. Sliding removed protruding parts of deltas-often the youngest parts-and steepened delta fronts, increasing the chances of further sliding. Fathograms show that debris from large slides spread widely over the lake floor, some reaching the toe of...

McCulloch, David S.
Slide-induced waves, seiching and ground fracturing caused by the earthquake of March 27, 1964 at Kenai Lake, Alaska: Chapter A in The Alaska earthquake, March 27, 1964: regional effects; 1966; PP; 543-A; The Alaska earthquake, March 27, 1964: regional effects (Professional Paper 543); McCulloch, David S.

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Year Published: 1966

The Alaska earthquake, March 27, 1964: field investigations and reconstruction effort

One of the greatest geotectonic events of our time occurred in southern Alaska late in the afternoon of March 27, 1964. Beneath a leaden sky, the chill of evening was just settling over the Alaskan countryside. Light snow was falling on some communities. It was Good Friday, schools were closed, and the business day was ending. Suddenly without...

Hansen, Wallace R.; Eckel, Edwin B.; Schaem, William E.; Lyle, Robert E.; George, Warren; Chance, Genie
The Alaska earthquake, March 27, 1964: field investigations and reconstruction effort; 1966; PP; 541; Hansen, Wallace R.; Eckel, Edwin B.; Schaem, William E.; Lyle, Robert E.; George, Warren; Chance, Genie

Filter Total Items: 1,083
Vanessa von Biela with cut bank at Canning River
April 25, 2019

Vanessa von Biela with cut bank at Canning River

Supporting the project of winter habitat of juvenile Dolly Varden in the Canning River.

Copper River sonar on a bridge
April 24, 2019

Copper River sonar on a bridge

Copper River sonar on a bridge

Canning River with Brooks Range in the background
April 24, 2019

Canning River with Brooks Range in the background

Supporting the project of winter habitat of juvenile Dolly Varden in the Canning River.

Knik River bridge aerial view
April 22, 2019

Knik River bridge aerial view

Knik River bridge aerial view

Andrew Reeves retrieving samples at Izembek National Wildlife Refuge, Alaska
April 15, 2019

Andrew Reeves retrieving samples at Izembek NWR

Andrew Reeves retrieving samples within Izembek National Wildlife Refuge, Alaska as part of USGS research to investigate the persistence of avian influenza viruses in North American wetlands.  USGS scientists and colleagues found that influenza A viruses may remain infectious in surface waters of northern wetlands for more than seven months. 

Sea otter skulls being prepared for archival
March 28, 2019

Sea otter skulls being prepared for archival

Skulls were collected in Spring 2018 & 2019 from coastlines throughout Alaska. It is assumed the animals died of natural causes over the preceding winters. They were collected under Marine Mammal Permit # 067925.

Twentymile River bridge
March 27, 2019

Twentymile River bridge

Twentymile bridge

A photo from the sky of a coastline showing areas of sediment and water as well as land features like roads.
February 26, 2019

Orthophotomosaic image, north coast of Barter Island, July 1, 2014

Aerial photographs were collected from a small, fixed-wing aircraft over the coast of Barter Island, Alaska on July 01 2014, September 07 2014. Precise aircraft position information and structure-from-motion photogrammetric methods were combined to derive a high-resolution orthophotomosaic. This orthophotomosaic contain 3-band, 8-bit, unsigned raster data (red/green/blue;

...
Evidence of turbidity currents in Eklutna Lake triggered by shaking during the 2018 Mw7.1 Anchorage earthquake
February 16, 2019

Evidence of turbidity currents in Eklutna Lake

USGS scientists, working with researchers from the University of Ghent, probed the floor of Eklutna Lake, Anchorage Borough, Alaska, for evidence of turbidity currents triggered by strong shaking during the 2018 Mw7.1 Anchorage earthquake. In this photo, USGS scientist Peter Haeussler points to a dark layer at the top of a sediment core taken from the floor of Eklutna Lake

...
USGS researcher Erich Peitzsch holds a tree cross section to look for irregular rings.
December 31, 2018

Tree ring research in Alaska

USGS researcher Erich Peitzsch holds a tree cross section to look for irregular rings.

UAS undergraduate student Mckenzie Wilson examines a cross section.
December 31, 2018

Tree ring research in Alaska

UAS undergraduate student Mckenzie Wilson examines a cross section.

Map of AK showing probability of change occurrence
December 31, 2018

Map of AK showing probability of change occurrence

Map of Alaska showing probability (%) of change occurrence. Insets show fire boundaries from the Bureau of Land Management (BLM) Large Fire Database and Landsat 8 imagery (bottom right; 2016) north of Fairbanks, Alaska.

Filter Total Items: 279
USGS
July 24, 2014

Alaska — Due to climate change, some communities in rural Alaska and the Yukon Territory of Canada may face a future with fewer caribou according to new research published by the U.S. Geological Survey and the University of Alaska, Fairbanks in the recent issue of PLoS ONE.

USGS
July 9, 2014

Monitoring wildlife in the Arctic is difficult. Study areas are cold, barren and often inaccessible. For decades scientists have struggled to study animals, like polar bears, which live in these remote areas. Now researchers at the U.S. Geological Survey have begun testing a new, yet counterintuitive solution – rather then get close to the animals, monitor them from afar. 

USGS science for a changing world logo
July 3, 2014

As part of a continuing earthquake hazard study in the Seattle urban area, the U. S. Geological Survey will be conducting a series of seismic-reflection surveys starting July 10 on Mercer Island and the city of Seattle, Washington. The studies will conclude on or around July 19.

USGS science for a changing world logo
July 3, 2014

Starting on July 5 (weather permitting), U.S. Geological Survey scientists will conduct a high-resolution airborne survey over the next 30 days to study the distribution of minerals exposed at the surface in various parts of Alaska.

USGS science for a changing world logo
July 3, 2014

Starting on July 5 (weather permitting), U.S. Geological Survey scientists will conduct a high-resolution airborne survey over the next 30 days to study the distribution of minerals exposed at the surface in various parts of Alaska.

USGS
June 6, 2014

The first "point of view" video from a polar bear on Arctic sea ice has just become available courtesy of the U.S. Geological Survey. 

USGS science for a changing world logo
May 28, 2014

The U.S. Geological Survey is reducing its footprint on the Alaska Pacific University campus by closing the Map Store @ USGS to lower rent costs. The store will remain open through Oct. 31, 2014.

2014 US Topo map of the Keedysville, Maryland area.
May 22, 2014

US Topo maps now have a crisper, cleaner design - enhancing readability of maps for online and printed use. Map symbols are easier to read over the digital aerial photograph layer whether the imagery is turned on or off.

Lidar image showing the upper parts of the landslide that occurred in northwest Washington on March 22, 2014.
May 14, 2014

Want to know how elevation will benefit your state? The USGS National Geospatial Program is advancing the 3D Elevation Program, known as 3DEP, in response to the growing need for high-quality three-dimensional representations of the Nation’s natural and constructed features.

USGS science for a changing world logo
April 30, 2014

The coastal geology of Simeonof Island, the southeastern-most island in the Shumagin archipelago of the Aleutian Islands, suggests the region has not experienced a great megathrust earthquake in at least the past 3,400 years.

US Topo map of the Cass, West Virginia quadrangle, March 2014.
April 24, 2014

US Topo maps now have a crisper, cleaner design - enhancing readability of maps for online and printed use. Map symbols are easier to read over the digital aerial photograph layer whether the imagery is turned on or off. Improvements to symbol definitions (color, line thickness, line symbols, area fills), layer order, and annotation fonts are additional features of this supplemental release.