Overflight structure-from-motion digital elevation model and orthophotos of Shishaldin Volcano, Alaska, 2024

The Alaska Volcano Observatory conducted overflights of Shishaldin Volcano, Alaska, in July–August 2024 to characterize the morphological changes to the summit area following the 2023 and 2019–2020 eruptions. Oblique airphotos were taken during helicopter overflights on July 30 and August 1. The photos were processed with structure-from-motion (SfM) photogrammetric methods to derive a digital elevation model (DEM) and orthoimagery. A combined mosaicked DEM from both surveys and two orthoimages, one for each date, are provided with this data release. Comparison of this DEM with pre-eruptive data from 2018 shows extensive morphological changes associated with these eruptions. The 2023 eruption resulted in development of an east-northeast to west-southwest oriented trough that bisected the summit cone of the volcano. Compared to the pre-eruption DEM, the western trough had up to 113-meters of elevation loss, and the eastern trough up to 84-meters of elevation loss. The northern and southern intact rims of the summit crater have increased elevation with the apparent summit of the volcano increasing to 2877-meters from 2856-meters in the 2018 survey, and shifting to the northeast onto new cone material built up during these two recent eruptions.