Images

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. 

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.​

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

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 headscarp. 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.​

Jason Patton, Rob Anthony (USGS), and Skyler Grulke assemble a seismometer at the Physical Sciences Laboratory in Stoughton, Wisconsin on Aug. 7, 2025. (Photo by Taylor Wolfram / UW–Madison)

USGS Rob Anthony sets up equipment in a freezer to test a Seismometer Interface Module at the Physical Sciences Laboratory in Stoughton, Wisconsin on Aug. 7, 2025. (Photo by Taylor Wolfram / UW–Madison)

USGS Rob Anthony puts in the Seismometer Interface Module while assembling a seismometer at the Physical Sciences Laboratory in Stoughton, Wisconsin on Aug. 7, 2025. (Photo by Taylor Wolfram / UW–Madison)

Nicholas Pelyk, Jason Patton, Rob Anthony, and Skyler Grulke slide a part into the tube while assembling a seismometer at the Physical Sciences Laboratory in Stoughton, Wisconsin on Aug. 7, 2025. (Photo by Taylor Wolfram / UW–Madison)

Map of the United States and its territories showing 2024 International Building Code Seismic Design Categories and Risk Categories.

Map of the United States and its territories showing the distribution of average annualized earthquake losses by region (modified from Jaiswal and others, 2023). Economic losses from earthquakes in these nine regions are estimated to average \$14.7 billion dollars per year.