Volcanic activity worldwide 27 May 2021: Etna volcano, Kilauea, Nyiragongo, Nevados de Chillán, Great Sitkin

Map of today’s active volcanoes

Etna (Sicily, Italy): Another intense eruptive phase likely with lava fountains occurred this afternoon, but due to cloud cover, it was not possible to observe it very well visually.
Tremor started to rise in the morning, followed by increasing explosions and ash emissions from the New SE crater. It reached high peak values between around 14:40 and 15:15 local time, when the activity likely consisted in sustained lava fountains. Activity dropped sharply afterwards only to pick up again after about 2 hours and is currently again rising, possibly giving way to yet another lava fountain phase in the next hours or so.

Kilauea (Hawai’i): (26 May) Excerpt from the USGS Hawaiian Volcano Observatory’s May 26, 2021 Daily Update:
Activity Summary: Kīlauea Volcano is no longer erupting. Observations indicate that the eruption in Halema‘uma‘u at the summit of Kīlauea Volcano has paused. This morning, May 26, the lava lake is 229 m (751 ft) deep and is stagnant across its surface. Within the past 48 hours, no active lava was observed in webcam images of the Halema‘uma‘u crater lava lake surface. Field crews on May 25 did not observe any signs of lava lake activity, and reported no signs of recently active surface lava. Sulfur dioxide emission rates remain slightly elevated.
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HVO will issue a Volcano Activity Notice (VAN) lowering the Volcano Alert Level for ground based hazards from WATCH to ADVISORY and the Aviation Color Code from ORANGE to YELLOW. HVO continues to monitor Kīlauea Volcano closely for additional signs of changes in activity.
Summit Observations: The most recent sulfur dioxide (SO2) emission rates, measured on May 23, were 100 tonnes per day, continuing a trend of decreased emission rates that began in mid-April. The SO2 emission rates are now nearly at levels associated with the recent non-eruptive period from late 2018 to late 2020 (less than 50 tonnes per day), and are significantly lower than emission rates that averaged over 800 tonnes per day from mid-February to mid-April. Summit tiltmeters recorded slight but continuous deflation over the past 24 hours. Seismicity remains stable, with elevated tremor.

Great Sitkin (United States, Aleutian Islands): After the latest explosive eruption at the volcano yesterday, a seismic activity has decreased gradually although volcanic unrest continues as reported local observatory Alaska Volcano Observatory (AVO).
Surface temperatures continue at elevated levels identified in satellite data.
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No ash emissions are observed from surveillance cameras.
Prognosis for renewed eruptive activity is uncertain. Additional explosive events, effusive eruption, or a return to non-eruptive behaviors are all possible.

Nevados de Chillán (Central Chile): (26 May) Volcanic Ash Advisory Center Buenos Aires (VAAC) issued the following report: UNABLE TO DETECT

Nyiragongo (DRCongo): Authorities are highly concerned about the risk of a second – potentially more destructive if not catastrophic – eruption from the volcano in the near future and have ordered the partial evacuation of Goma, where a mass exodus seems to have started, making the overall situation even more chaotic and difficult.
The reason scientists worry are both a lack in precise monitoring data, the potential of large impact of an eruption, and the continuing earthquakes that rattle the area around Goma and Gyseni, as well as ground cracks in and around Goma, which might indicate that magma is accumulating beneath the area and could well lead to a new eruption.
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More than 200 tremors have been recorded in the past 2 days. According to some unconfirmed posts on social media, some of the new ground cracks expose glow beneath (likely from hot gasses if true).
According to latest findings of researchers, the recent eruption indeed drained the lava lake, but according to some sources, it has already partially refilled (or did not drain entirely).

Current tremor signal showing the peaks of the recent and likely to be soon paroxysms (image: INGV Catania)