Images

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.

Snow avalanche on the north side of Mt. King George. The debris lobe is 1800 m long and runs up onto the hillside across the valley. Photo courtesy of Yukon Geological Survey. 

Snow avalanches in the valley on the east side of McArthur Peak. 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. 

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. 

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 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. 

Oblique aerial photo of the August 10, 2025 landslide source area captured during a field reconnaissance overflight on August 13, 2025. Look direction is approximately north.​

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

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

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 headscarp. Look direction is to the northwest.​

Oblique aerial photo of the August 10, 2025 landslide across-fiord runup zone and South Sawyer Glacier captured during a field reconnaissance overflight on August 13, 2025. Look direction is to the southeast.​

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 the August 10, 2025 landslide. Look direction is to the south.​

Oblique aerial photo of the August 10, 2025 landslide and South Sawyer Glacier captured during a field reconnaissance overflight on August 13, 2025. Look direction is to the southeast.​

Oblique aerial photo of the August 10, 2025 landslide source area captured during a field reconnaissance overflight on August 13, 2025. Look direction is approximately north.​

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.​