Volcanic activity worldwide 31 May 2021: Reventador volcano, Semisopochnoi

Map of today’s active volcanoes

Semisopochnoi (United States, Aleutian Islands): After almost 3 weeks, since the volcano observatory lowered Volcanic Alert Level to Yellow, the Alaska Volcano Observatory (AVO) reported that a low-level eruptive activity renewed at 09:45 local time yesterday.
Continuing low-level ash emissions reached 5,000 ft (1,500 m) altitude and were dispersed towards the south over Amchitka Island.
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An elevated volcanic tremor (continuous shaking), that accompanied the event, continues at fluctuating intensity characterized by periods of high and low amplitudes.
A satellite image shows highly elevated surface temperatures in the Mount Cerberus crater.

Reventador (Ecuador): The effusive-explosive eruption of the volcano continues.
Near-frequent explosions of small to moderate size continue to erupt from the summit crater producing ash plumes that reached up to 15,000 ft (4,600 m) altitude. Volcanic ash is dispersed toward the W-NW.
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Incandescence continues to be observed in the summit crater.
Two lava flows continue to be active on the north and south slopes of the volcano that caused glowing rockfalls to detach from it and roll down along the flanks.

Volcano Activity Summary for 31 May 2021:

Elevated surface temperatures in the inner Cerberus crater (image: Sentinel 2)