Shishaldin volcano (Aleutian Islands, Alaska): weak tremor, lava in summit crater

Recent unrest (seismic tremor, thermal anomalies) has increased and a new, very minor eruption is underway. AVO field crews observed a small lava lake inside the deep funnel-shaped summit crater, but the activity has been contained within the crater so far. This is similar to the last eruption in 2014-15. The alert level has been raised to ORANGE/WATCH. A more substantial eruption is possible (like that of 1999) but there is no indication of this occurring so far. ... Read all

On 23 July field crews observed minor spattering and surface lava flows in Shishaldin's summit crater during an overflight, prompting AVO to raise the Aviation Color Code to Orange and the Volcano Alert Level to Watch. Elevated surface temperatures were observed in multiple satellite images during 24-30 July, though views were sometimes obscured by weather clouds. Nearly continuous weak seismic tremor was detected, and occasional infrasound signals consistent with small Strombolian explosions were recorded during 26-27 July. ... Read all