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Alaska

Two maps of the study region displaying earthquake depth as colored dots.
Posted inEditors' Highlights

Aftershocks Reveal Coseismic Rupture of Megathrust Earthquakes

by Agnes Helmstetter 28 July 202221 July 2022

More accurate aftershock zones reveal that the rupture areas of megathrust Aleutian–Alaska earthquakes are larger than we thought and partly overlap, in contradiction with the seismic gap hypothesis.

Map of Alaska showing the study regions and a bar graph showing wildfire events by year.
Posted inEditors' Highlights

Lightning in Alaskan Tundra Ignites Most Fires

by Valeriy Ivanov 19 July 202211 August 2022

Cloud-to-ground lightning is found to be the most important controller of wildfire occurrence in the Artic tundra of Alaska from 2001 to 2019.

Polygons created by melting permafrost
Posted inNews

More Fires, More Problems

by Danielle Beurteaux 1 February 202221 March 2022

Increasing incidents of wildfires in the Arctic are not only thawing permafrost but changing the entire underlying structure of the region.

A black-and-white photograph of a river.
Posted inNews

What a Gold Mining Mishap Taught Us About Rivers

by Jenessa Duncombe 13 January 202221 March 2022

Miners in Alaska rerouted a river to search for gold. One hundred years later, the new channel is teaching scientists how rivers shape Earth.

Plot showing the latitudinal profile of F-region meridional wind as a function of local time for the day of 4 January 2019.
Posted inEditors' Highlights

Thermospheric Cross-Polar Winds Observed to Unexpectedly Stall

by Michael P. Hickey 7 October 202113 October 2021

Observations of cross-polar cap neutral winds near 240 km altitude stalling over short distances in the midnight sector near Poker Flat, Alaska, challenge the standard view of high-latitude dynamics.

Image of Sean de Guzman of the California Department of Water Resources conducting a snow survey in the Sierra Nevada.
Posted inFeatures

The Changing Climate’s Snowball Effect

by Korena Di Roma Howley 24 September 202112 April 2022

Shrinking snowpack, thawing permafrost, and shifting precipitation patterns have widespread consequences. Can new technologies—and public policies—help communities adapt?

A student takes notes in Arctic Alaska.
Posted inNews

Testing on the Tundra: NASA Snow Program Heads North

by J. Besl 27 July 202111 August 2022

With infrastructure, experience, and a slice of the world’s largest snow biomes, Alaska is an essential research destination for NASA’s multiyear SnowEx campaign.

Sunrise over snow.
Posted inNews

Laser Flashes Shed Light on a Changing Arctic

by Katherine Kornei 18 May 202116 February 2022

An ongoing project in northern Alaska is using pulses of laser light to monitor anthropogenic activity, ice quakes, and marine wildlife.

Aerial view of Taku Glacier’s terminus in Taku Inlet
Posted inScience Updates

The Imminent Calving Retreat of Taku Glacier

by C. McNeil, J. M. Amundson, S. O’Neel, R. J. Motyka, L. Sass, M. Truffer, J. M. Zechmann and S. Campbell 18 February 202129 September 2021

Long an anomaly among glaciers, advancing while most others shrank, Taku Glacier is starting to succumb to climate change, offering an unprecedented look at the onset of tidewater glacier retreat.

View looking out a helicopter cockpit over remote eastern Alaska landscape
Posted inScience Updates

Ancient Rivers and Critical Minerals in Eastern Alaska

by A. Bender, R. Lease, J. V. Jones III and D. Kreiner 29 July 20206 December 2021

Fieldwork is revealing a history of landscape evolution over the past 5 million years that links climate change and river capture to critical mineral resources across the Alaska-Yukon border.

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