This United States Coast Guard photograph captures Alaska's Pavlof volcano erupting last week.
The volcano belched an ash cloud that reached as high as 11,000m, triggering aviation warnings.
The active mountain lies near the south-western tip of the Alaskan peninsula, about 1,000km from Anchorage. It rises more than 2,500m and is one of the tallest volcanoes in Alaska, and one of the most active. It last erupted in November 2014.
This latest round of seismic activity has now ended, according to the Alaska Volcano Observatory. But scientists warned that the mountain remained "restless" and could stir again with little or no warning.