Okmok volcano, one of the most active volcanoes in the Aleutian Islands, erupted between 12 July and 19 August 2008 and produced a new tephra cone (Ahmanilix) up to 253 m high. A coeruptive deposit thickness map and the posteruptive elevation change rate map are generated for this phreatomagmatic eruption using the new, high‐resolution (2 m) digital elevation model (DEM) time series provided by ArcticDEM. The total dense rock equivalent (DRE) volume over the proximal deposit field classified from the elevation change map is estimated as 0.147 ± 0.001 km³ DRE (bulk volume of 0.453 ± 0.003 km³). Combined with the distal deposit volume derived from field measurements, the total DRE is 0.25 km³ (bulk volume of 0.76 km³). The estimated erosion rate is up to −15 ± 3 m/year along the flanks of Ahmanilix, and the redeposition rate is about 1 ± 0.3 m/year at the base and 6 ± 1 m/year within the center of Ahmanilix. The surface elevation change also reveals a large ground surface collapse that disrupted the old Cone D lava bench, with a total collapse area of 0.15 km² and a volume of (7.1 ± 0.4) × 10⁻³ km³. We also produce a coeruptive deformation map from satellite interferometric synthetic aperture radar (InSAR) using topography from both ArcticDEM and the Shuttle Radar Topography Mission (SRTM) and compare the results. Finally, based on historical eruption volumes, the magma supply rate at Okmok is estimated as (1.77 ± 0.1) × 10⁻³ km³/year.

中文翻译：

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从ArcticDEM和InSAR进行的Okmok的2008年岩浆喷发的特征：沉积，侵蚀和变形

Okmok火山是阿留申群岛上最活跃的火山之一，于2008年7月12日至8月19日爆发，并产生了一个新的Tephra锥（Ahmanilix），最高可达253 m。使用ArcticDEM提供的新的高分辨率（2 m）数字高程模型（DEM）时间序列，为喷发岩浆喷发生成了沉积物厚度图和后高程变化率图。根据高程变化图分类的近端沉积场上的总致密岩石当量（DRE）体积估计为0.147±0.001 km ³ DRE（散装体积为0.453±0.003 km ³）。结合野外测量得出的远端沉积量，总DRE为0.25 km ³（散装量为0.76 km ³）。沿阿曼尼利克斯（Ammanilix）侧翼的估计侵蚀速率最高为-15±3 m /年，基底部的再沉积速率约为1±0.3 m /年，而在阿曼尼利克斯（Ahmanilix）中心内部的再沉积速率约为6±1 m /年。地表高程变化还显示出大的地表塌陷，破坏了旧的Cone D熔岩台，总塌陷面积为0.15 km ²，体积为（7.1±0.4）×10 ^-3  km ³。我们还使用ArcticDEM和航天飞机雷达地形任务（SRTM）的地形从卫星干涉式合成孔径雷达（InSAR）生成了协同变形图，并比较了结果。最后，根据历史喷发量，估计Okmok的岩浆供应速率为（1.77±0.1）×10 ^-3  km ³/年。