Volcanic activity worldwide 21 Apr 2020: Klyuchevskoy volcano, Popocatépetl, Semeru, Dukono, Rincó...

Bardarbunga (Central Iceland): (21 Apr) On 20 April at 03:54 local time an earthquake with magnitude M 4.8 were detected by the seismic network in the Bardarbunga caldera, few small aftershocks followed but no volcanic tremor has been detected.
On January 5th 2020 earthquakes of similar magnitude were detected.
Source: Icelandic Met Office volcano activity update 21 April 2020

Klyuchevskoy (Kamchatka): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Tokyo warned about a volcanic ash plume that rose up to estimated 18000 ft (5500 m) altitude or flight level 180 and is moving at 25 kts in SE direction.
The full report is as follows: VA EMISSIONS CONTINUING OBS VA DTG:21/1120Z to 18000 ft (5500 m)
...21 Apr:
The eruption of the volcano continues, mainly characterized by effusive activity, i.e. the emission of a lava flow from the summit crater onto the SE flank.
The intensity of the eruption is not particularly great, however; the lava flow is advancing only slowly and has made little progress on the steep slopes of the world's tallest stratovolcano. This suggests a rather modest effusion rate.

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Intermittent small to moderate explosions, probably strombolian in type, generate occasional ash plumes that rise a few hundred meters.
As a beautiful greeting to the world, the volcano sent out a large steam ring into the air earlier today - a ring vortex created when a sudden pulse of gas leaves a circular vent:


Aso (central Kyushu, Japan): Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: ACTIVITY CONT. VA AT 20200421/1200Z FL060 EXTD E OBS VA DTG:21/1150Z

Semeru (East Java, Indonesia): (21 Apr) Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: VA OBS TO FL140 MOV N OBS VA DTG:21/0221Z

Dukono (Halmahera): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 7000 ft (2100 m) altitude or flight level 070 and is moving at 5 kts in NW direction.
The full report is as follows: CONTINUOUS VA EMISSION TO FL070 OBS VA DTG:21/1215Z to 7000 ft (2100 m)

Popocatépetl (Central Mexico): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 21000 ft (6400 m) altitude or flight level 210 .
The full report is as follows: OCNL VA EMS OBS IN STLT AND SUMMIT WEB CAM to 21000 ft (6400 m)

Rincón de la Vieja (Costa Rica): (21 Apr) On 19 April at 10:16 local time a strong explosion occurred at the volcano. According to OVSICORI-UNA, it was a phreatic or hydrothermal explosion that generated a steam and ash plume that rose approx. 4,921 ft (1,500 m) above the crater.
It also produced pyroclastic flows that traveled over the upper slopes, as can be seen in the video recorded:
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#RincóndelaVieja 19 abril 20:20 10:16 am pic.twitter.com/cghuybRtcj

— OVSICORI-UNA (@OVSICORI_UNA) April 19, 2020

Sangay (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 20000 ft (6100 m) altitude or flight level 200 .
The full report is as follows: VA CLDS OBS IN STLT IMAGERY AT 1030Z to 20000 ft (6100 m)

Reventador (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 15000 ft (4600 m) altitude or flight level 150 .
The full report is as follows: VA CLDS OBS IN STLT IMAGERY AT 1230Z to 15000 ft (4600 m)

Sabancaya (Peru): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Buenos Aires warned about a volcanic ash plume that rose up to estimated 24000 ft (7300 m) altitude or flight level 240 .
The full report is as follows: SPORADIC PUFFS OF VA to 24000 ft (7300 m)

Nevados de Chillán (Central Chile): Volcanic Ash Advisory Center Buenos Aires (VAAC) issued the following report: ISOLATED PUFF OF VA