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Landslide and Avalanche Debris Litter Hubbard Glacier

2026-02-25 05:00




November 26, 2025
December 8, 2025

False-color radar images show more rough terrain (green) in the St. Elias Mountains near Hubbard Glacier after an earthquake on December 6, 2025, indicating landslides and avalanches.
False-color radar images show more rough terrain (green) in the St. Elias Mountains near Hubbard Glacier after an earthquake on December 6, 2025, indicating landslides and avalanches.
NASA Earth Observatory / Lauren Dauphin

False-color radar images show more rough terrain (green) in the St. Elias Mountains near Hubbard Glacier after an earthquake on December 6, 2025, indicating landslides and avalanches.
False-color radar images show more rough terrain (green) in the St. Elias Mountains near Hubbard Glacier after an earthquake on December 6, 2025, indicating landslides and avalanches.
NASA Earth Observatory / Lauren Dauphin

False-color radar images show more rough terrain (green) in the St. Elias Mountains near Hubbard Glacier after an earthquake on December 6, 2025, indicating landslides and avalanches.
False-color radar images show more rough terrain (green) in the St. Elias Mountains near Hubbard Glacier after an earthquake on December 6, 2025, indicating landslides and avalanches.
NASA Earth Observatory / Lauren Dauphin

False-color radar images show more rough terrain (green) in the St. Elias Mountains near Hubbard Glacier after an earthquake on December 6, 2025, indicating landslides and avalanches.
False-color radar images show more rough terrain (green) in the St. Elias Mountains near Hubbard Glacier after an earthquake on December 6, 2025, indicating landslides and avalanches.
NASA Earth Observatory / Lauren Dauphin


November 26, 2025

December 8, 2025


On December 6, 2025, a powerful magnitude 7.0 earthquake struck the remote St. Elias Mountains, a highly glaciated range that spans the Yukon-Alaska border. The quake shook the landscape beneath Hubbard Glacier, sending ice and rock careening down the range’s steep slopes. The NISAR (NASA-ISRO Synthetic Aperture Radar) satellite offered some of the earliest views of the changed landscape.

Geophysicist Eric Fielding and colleagues at NASA’s Jet Propulsion Laboratory (JPL) typically use satellite data to map the displacement of the ground after major earthquakes strike land. But in this region, such maps—known as interferograms—are not possible because the ground lies buried beneath a layer of glacial ice that’s at least 700 meters (2,000 feet) thick. “The cryosphere is covering up the geosphere,” Fielding said.

Instead, clues to the earthquake’s destructive power lay strewn atop the ice surface. The shaking on December 6 unleashed landslides and avalanches that swept debris onto lower, flatter stretches of the glacier. The debris is visible in radar imagery acquired by NISAR on December 8, two days after the quake (right). For comparison, the NISAR image on the left shows the same area on November 26, a week and a half before the quake.

Where the slides have deposited rock, snow, and other debris, surfaces have become rougher, which scatters more energy back toward the sensor and makes those areas appear bright in the December 8 image (the roughest areas are shown in dark green). Areas with smooth surfaces reflect little of the radar’s energy directly back to the satellite sensor, so these parts of the images appear dark (shown in purple). Note that there are some exceptionally rough, green surfaces beyond the new slide areas that remain relatively unchanged between the two images.




November 26, 2025
December 8, 2025

False-color radar images show a detailed view of the area around Mount King George and McArthur Peak, where most of the landslides and avalanches were visible following an earthquake on December 6, 2025.
False-color radar images show a detailed view of the area around Mount King George and McArthur Peak, where most of the landslides and avalanches were visible following an earthquake on December 6, 2025.
NASA Earth Observatory / Lauren Dauphin

False-color radar images show a detailed view of the area around Mount King George and McArthur Peak, where most of the landslides and avalanches were visible following an earthquake on December 6, 2025.
False-color radar images show a detailed view of the area around Mount King George and McArthur Peak, where most of the landslides and avalanches were visible following an earthquake on December 6, 2025.
NASA Earth Observatory / Lauren Dauphin

False-color radar images show a detailed view of the area around Mount King George and McArthur Peak, where most of the landslides and avalanches were visible following an earthquake on December 6, 2025.
False-color radar images show a detailed view of the area around Mount King George and McArthur Peak, where most of the landslides and avalanches were visible following an earthquake on December 6, 2025.
NASA Earth Observatory / Lauren Dauphin

False-color radar images show a detailed view of the area around Mount King George and McArthur Peak, where most of the landslides and avalanches were visible following an earthquake on December 6, 2025.
False-color radar images show a detailed view of the area around Mount King George and McArthur Peak, where most of the landslides and avalanches were visible following an earthquake on December 6, 2025.
NASA Earth Observatory / Lauren Dauphin


November 26, 2025

December 8, 2025


The largest slide in the scene appears to be cascading down the flank of Mount King George, but it’s far from the only one. Numerous others scar the surrounding terrain, including areas to the west along the slopes of Mount Logan, Canada’s tallest mountain.

Alex Gardner, a glaciologist at JPL and member of the NISAR science team, reviewed the images with Fielding. “The sheer number and magnitude of avalanches and landslides is astounding,” Gardner said. “I’ve personally never seen anything like this before.”

A separate preliminary analysis by the U.S. Geological Survey identified more than 700 potential landslides and snow avalanches, with an especially high concentration northwest of the epicenter along the fault rupture. Follow-up flights by the Yukon Geological Survey on December 12 provided a closer look, showing some slopes remained actively unstable, with dust still hanging in the air, and widespread damage to glacial ice.

Much of the debris that settled atop the region’s glacial ice is likely being transported toward the ocean by the glaciers’ ongoing seaward flow, which acts as a natural “conveyor belt.” For example, a tributary glacier of Hubbard north of Mount King George, which had previously moved at a sluggish pace, entered a surging phase in November before the earthquake. It is now moving downslope at what Gardner described as “breakneck speeds” of up to 6,000 meters per year (about 50 feet per day).

Although the region is uninhabited, the slides and damaged ice could pose new hazards for mountaineers and other expeditions, USGS noted in a December 18 update. The town of Yakutat, Alaska, about 90 kilometers (56 miles) south of the epicenter, is a common staging point for people exploring the area.

NISAR observations are expected to provide imagery to support future natural disaster response efforts.

Images by Gustavo Shiroma (JPL) of the NISAR Algorithm Development Team using data from the NISAR GSLC product, and prepared for NASA Earth Observatory by Lauren Dauphin. Story by Kathryn Hansen.

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2026-02-24 21:21

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Curiosity Blog, Sols 4812-4819: Back Into the Hollows

A grayscale landscape photo from the Martian surface shows a dark gray band of sandy terrain in the foreground, filling the bottom quarter of the frame, topped by a jagged, rocky ridge along its right half. Beyond that is a more distant area in very light gray, creating a horizon line from the lower third of the left side of the image, upward toward the center-right edge. This area and the sky above is very hazy, as if clouded by a dust storm.
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NASA/JPL-Caltech

Written by Diana Hayes, Graduate student at York University, Toronto

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This has been a pretty routine week for Curiosity. As was mentioned last week, we’re now in the final phase of the boxwork exploration campaign. We’re currently making our way toward the eastern contact of the boxwork formation with the surrounding geology, which we plan to drive along before turning our attention to the southern contact. That will likely be our last opportunity to directly interrogate the boxwork area before we continue our adventure up the slopes of Mount Sharp.

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A rover sits on the hilly, orange Martian surface beneath a flat grey sky, surrounded by chunks of rock.
NASA’s Curiosity rover at the base of Mount Sharp
NASA/JPL-Caltech/MSSS

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Last Updated

Feb 24, 2026

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On April 8, 2024, volunteers participating in NASA’s Eclipse Megamovie citizen science project all around the United States hurried to photograph the solar eclipse with the latest, greatest equipment, capturing groundbreaking images of the Sun’s corona.

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Black and white photograph of 2024 total solar eclipse. Black circle in the middle surrounded by white sun beams
Photograph taken during the April 8th, 2024, total solar eclipse uploaded by EM2024 volunteer Franz Zabroky G. This picture has been aligned and processed and is available in the new database. https://eclipsemegamovie.org/database.
Franz Zabroky G.

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Last Updated

Feb 24, 2026

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Image credit: ESA/Webb, NASA, CSA, STScI, P. Tiranti, H. Melin, M. Zamani (ESA/Webb)

Technology Originally Developed for Space Missions Now Integral to Everyday Life

2026-02-24 14:29

Groundbreaking “camera-on-a-chip” technology that was originally developed at NASA’s Jet Propulsion Laboratory (JPL) for use in space missions is currently employed in billions of devices like cell phones that are used daily by people worldwide.

A group of people standing in a lab surrounded by technical equipment.
Eric Fossum (in the center of the front row) and the team that invented the CMOS image sensor on site at NASA’s Jet Propulsion Laboratory.
Courtesy NASA/JPL-Caltech

In the 1980s, sensors used to produce high-quality images for space science (including the amazing images from NASA’s Hubble Space Telescope) and other applications employed charge coupled device (CCD) technology. Dr. Eric Fossum was originally hired at JPL in 1990 to advance CCD technology for use in interplanetary space missions, but he ended up advancing another technology called complementary metal-oxide semiconductor (CMOS) technology for that purpose and much more. While at JPL, Fossum took advantage of a technique commonly used for CCDs and applied it to CMOS sensors to develop the first CMOS active pixel image sensor. This development began a chain of events that led to the present use of CMOS technology not only in space science missions, but also in billions of cameras in smartphones, webcams, automobiles, and medical devices used worldwide.

A new technology emerges…

In 1990, CCDs were the primary technology used to generate high-quality images. CCD sensors consist of arrays of pixels that convert light into electric charges. The charge from each pixel is transferred step-by-step to an output amplifier at the corner of the sensor and converted to a voltage that represents the brightness of the light received at the corresponding pixel. The data from all the pixels is then aggregated to generate an image. While CCD cameras can produce very high-quality images that are suitable for scientific use, they require a lot of power and an efficient charge transfer process to be effective.

CMOS sensors, on the other hand, have signal amplifiers within each pixel and signals can be read directly from each pixel instead of being transferred long distances to an amplifier for conversion. CMOS sensors therefore require less voltage to operate than CCDs and issues with the charge transfer process such as radiation susceptibility are greatly reduced. Although CMOS sensors existed in the 1990s, they produced too much noise to produce high-quality images required for science applications.

To reduce the signal noise typical of CMOS sensors at that time, Fossum applied a technique that was often used in CCD devices. This technique—called “intra-pixel charge transfer with correlated double sampling”—enables a double measurement of a pixel’s voltage without and with the light-generated charge. Subtracting the values of these two samples enables noise to be suppressed, improving the signal-to-noise ratio.

The next steps

Soon several companies signed Technology Cooperation Agreements with JPL and partnered with Fossum and his colleagues to develop the promising new technology. In 1995, Fossum and co-worker Dr. Sabrina Kemeny licensed the technology from CalTech and founded a company called Photobit to develop CMOS sensors. In 1996, Fossum left JPL to work at Photobit full time. The Photobit, team further refined the CMOS technology to get it closer to CCD capabilities, reduce power requirements, and make manufacturing cheaper.

Shortly thereafter, CMOS cameras started to be used in webcams, “pill cams” (small, swallowable devices that incorporate a tiny camera to take thousands of high-resolution images of the digestive tract), and other applications. In 2001 Photobit was acquired by Micron Technology, a larger company that devoted even more resources to development of CMOS technology. With the subsequent explosion of the cell phone industry, by 2013 more than a billion CMOS sensors were manufactured each year, and today that number has grown to about seven billion per year.

Where are these sensors now?

The CMOS technology Dr. Fossum originally developed has not only enabled space science, it has been infused into devices we depend on every day, dramatically and positively transforming many aspects of our lives. Virtually all digital still and video cameras, including those on cell phones, employ them. In addition, CMOS technology is used in automotive electronics, webcams, sports cameras, industrial equipment, security cameras including doorbells, and cinematography cameras, and for medical and dental imaging, among many other applications.

Image of solar wind racing out from the Sun’s outer atmosphere, looking like smoke on a black background.
A frame from a video made from images taken by the Wide-Field Imager for Solar Probe (WISPR) instrument (which employs CMOS technology) onboard NASA’s Parker Solar Probe. This image was captured during the mission’s record-breaking flyby of the Sun on Dec. 25, 2024, and shows the solar wind racing out from the Sun’s outer atmosphere, the corona.
Credit: NASA/Johns Hopkins APL/Naval Research Lab

In addition to dominating the commercial and consumer market, CMOS imagers have been used as engineering cameras to enable the entry, descent, and landing of NASA’s Perseverance Mars rover, in the camera onboard the OCO-3 (Orbiting Carbon Observatory-3) mission that monitors the distribution of carbon dioxide on Earth, and as scientific imagers on NASA’s Parker Solar Probe mission that is revolutionizing our understanding of the Sun. CMOS imagers are on their way to Jupiter’s moon, Europa, on the agency’s Europa Clipper mission, and a delta-doped ultraviolet version with tailored response is under development for use on the upcoming UVEX (UltraViolet EXplorer) mission that will provide insight into how galaxies and stars evolve.

CMOS imagers are routinely used in monitoring the launch and deployment of CubeSats and SmallSats. They were recently used to monitor the deployment of Pandora, a small satellite that will characterize exoplanet atmospheres and their host stars; BLACKCAT (the Black Hole Coded Aperture Telescope), a small X-ray telescope; and the SPARCS (Star-Planet Activity Research CubeSat) mission designed to monitor and characterize the stellar flares of low-mass stars in ultraviolet to provide context for the habitability of exoplanets in their system. NASA is also developing descendants of this technology for use in missions that will search for life beyond Earth like its Habitable Worlds Observatory.

In recognition of the impact this CMOS technology has had, the National Academy of Engineering (NAE) has named Dr. Fossum the recipient of the 2026 Charles Stark Draper Prize for Engineering “for innovation, development, and commercialization of the complementary metal-oxide semiconductor (CMOS) active pixel image sensor ‘camera-on-a-chip.’” The NAE bestows this award biennially to honor an engineer “whose accomplishment has significantly impacted society by improving the quality of life, providing the ability to live freely and comfortably, and/or permitting the access to information.”

Sponsoring Organizations: The original efforts at JPL to develop this CMOS technology were funded by JPL and NASA.

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Last Updated

Feb 24, 2026

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