Images

Snow avalanches in the valley on the east side of McArthur Peak. Photo courtesy of Yukon Geological Survey.

Collapsed snow bridges on crevasse field on the Hubbard Glacier between McArthur Peak and Mt. King George. Photo courtesy of Yukon Geological Survey. 

Collapsed snow bridges on crevasse field on the Hubbard Glacier between McArthur Peak and Mt. King George. Photo courtesy of Yukon Geological Survey. 

Seracs in an icefall on the east side of Mt. Vancouver (4812 m), toppled by shaking. Field of view is approximately 3.5 km wide. Photo courtesy of Yukon Geological Survey. 

Landslides on the west side of Mt. King George. The central debris lobe is 500 m wide. Photo courtesy of Yukon Geological Survey.

Landslides and avalanches on the east side of McArthur Peak. The left-hand debris lobe is 1100 m wide, and the right-hand debris lobe is 1500 m wide. The elevation difference between the peak and the glacier is approximately 1500 m.  Photo courtesy of Yukon Geological Survey.

 Large snow avalanche in valley east of McArthur Peak. Debris lobe is 1500 m wide. Photo courtesy of Yukon Geological Survey. 

Animation of Sentinel-1 radar backscatter satellite imagery from November 28^th and December 9^th, 2025, showing the changes in surface roughness after the M7.0 Hubbard Glacier Earthquake. The lighter regions have rougher surface areas. The colored points correspond to preliminary mapping of potential mass movements.

Overview maps at the same scale showing the epicenter of the M7.0 Hubbard Glacier Earthquake and modeled peak ground acceleration contours. A) shows the probability of landslides triggered by the earthquake and mapped faults, and B) shows the locations of landslides mapped using synthetic aperture radar (SAR) change detection. 

Landsat 9 true color, pan-sharpened satellite image collected on December 10, 2025, showing landslides triggered by the M7.0 Hubbard Glacier Earthquake on the slopes of Mount King George. Landslide points were mapped from SAR change detection.

A) Map of Sentinel-1 radar surface roughness change with photo locations and azimuths. B) Landsat 8 optical imagery from December 11, 2025, with photo locations and azimuths. 

10 Largest Earthquakes Ever Recorded (Updated 2025)

#10. MAGNITUDE 8.6 (1950). Arunachal Pradesh, India - Referred to as the Assam-Tibet earthquake, this quake produced intense shaking, triggered sandblows, ground cracks, and large landslides across the region. All told, 780 people died.

Schematic diagram of model domain and variables comprised of the lower shoreface (dark blue), upper shoreface (light blue), and beach/back barrier (yellow) environments.

Art of Inquiry show hosted at USGS on 22 September, 2025 as part of Flagstaff Festival of Science and in collaboration with Flagstaff Arts and Leadership Academy

Alaska Science Center Data Management staff organize, scan, and digitally archive physical data. Once published as part of a data release, the physical data are organized and placed into banker boxes, labeled with pertinent information, such as the data release DOI, and moved to a secure location.

Overview map and location of the Tracy Arm landslide-generated tsunami event. The imagery is not current, and the South Sawyer Glacier has retreated over a kilometer from what is depicted. 

Comparison of (a) pre- and (b) post-event satellite images showing the source area of the August 10th landslide that impacted Tracy Arm. The dashed line in (a) shows the approximate location of the front of South Sawyer Glacier on August 7th, 2025 (mapped from imagery © 2025 Planet Labs PBC).

Oblique aerial photo of the August 10, 2025 landslide taken from across the fiord during a field reconnaissance overflight on August 13, 2025. Look direction is approximately north.​

Photo of tsunami-inundated shoreline at Williams Cove, near the mouth of Tracy Arm. Look direction is approximately north.​

Oblique aerial photo of the August 10, 2025 landslide, and tsunami trimline, captured during a field reconnaissance overflight on August 13, 2025. Look direction is to the northwest.​

Oblique aerial photo of Sawyer Island captured during a field reconnaissance overflight on August 13, 2025. Look direction is to the southeast.​