This data release contains a radar-based remote sensing product used to detect regions of surface change in southern Yukon Territory, Canada and southeast Alaska, United States between November 28, 2025 and December 9, 2025, based on the availability of Sentinel-1 satellite data. Much of this surface change is interpreted to have been triggered by the M7.0 Hubbard Glacier Earthquake that occurred on December 6, 2025. This dataset was used to map probable landslides based on the increase of surface roughness that occurred between acquisitions (Allstadt and others, 2025).
The co-polarized amplitude difference (vv_diff_dB_20251128_20251209) measures the change in strength of the synthetic aperture radar (SAR) backscatter signal between acquisitions. SAR amplitude data were downloaded from the Sentinel-1 Ground Range Detection product collection from the Copernicus Data Space Ecosystem (available at https://dataspace.copernicus.eu/). The data are from Sentinel-1 satellites' ascending track 50. This collection is provided in the dB scale, multi-looked to 10x10 m/pixel, and geocoded. I selected the co-polarized data for each acquisition and differenced the acquisitions to produce the data product.
The data product shows all surface change between acquisitions and regions of poor data quality have not been masked. Some reasons for surface change in a snowy, mountainous environment include landslides, snow avalanches, new snowfall, changes in surface moisture, glacier movement and more (e.g., Rott and Mätzler, 1987; Lindsay and others, 2025). Reasons for poor data quality might include foreshortening and shadowing due to steep topography and the look angle of the satellite.
