Volcanic activity worldwide 9 Oct 2023: Stromboli volcano, Semeru, Dukono, Reventador, Mayon, Sangay…

Map of today’s active volcanoes

Stromboli (Eolian Islands, Italy): (9 Oct) The activity at the volcano continues at high levels is still ongoing at the time of this update.
A spattering has been picking up at the North crater area starting at 19:30 UTC yesterday indicating another batch of fresh magma shifting inside the volcano’s feeder pipe. This resulted in a formation of a new lava flow on the upper part of Sciara del Fuoco. The continuous bursting spattering keeps the flow active as hot fluid blebs fall to the ground and coalesce thereby forming the lava flow.
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Intermittent intense strombolian-type explosions continue to take place from both North and Central-South area vents at roughly regular intervals of every 3-to-5 minutes. The activity is being associated with medium gas-steam emissions, so-called degassing.
Prior to the eruption, a typical sharp spike in volcanic tremor was monitored at 19:15 UTC, but later decreased to medium-high levels.

Taal (Luzon, Philippines): (9 Oct) The low-level unrest at the volcano continues.
The Philippine Institute of Volcanology and Seismology’s (PHIVOLCS) webcam provided a time-lapse video of the fumarolic activity from the Main Crater within the caldera between 05:45 and 11:42 local time on 8 October. During this period, gas and steam emissions rose several dozen meters above the crater, but generally, they continue to rise to an estimated 1,500 meters above fumarolic vents.
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Sulfur dioxide (SO2) emissions reached to a 2887 tonnes on 8 October.
The Main Crater Lake’s temperature was measured at about 74.3 C on 3 October.

Mayon (Luzon Island, Philippines): (9 Oct) Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: ERUPTION AT 20231009/0550Z VA CLD UNKNOWN REPORTED OBS VA DTG:09/0550Z
…9 Oct:
The effusive activity of the volcano continues.
Three lava flow branches on the southeastern Bonga, southern Mi-isi flank and eastern Basud remain active, currently 3.4 km, 2.8 km and 1.1 km.
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Collapsing parts of viscous lava flow fronts continue to generate glowing avalanches (167) as they detach from it and roll down to the base of the edifice at about 4 km distance from the summit.
Moreover, block-and-ash flows continue to emanate from the summit lava dome as accumulated viscous lava material from the main conduit makes the dome prone to collapse, ooze out from there and tumble down in the form of dome-block avalanches. Pyroclastic density currents usually form ash plumes – phoenix clouds – towering wall of cloud rising above pyroclastic torrent. Pyroclastic flows are deadly, turbulent hot avalanche of lava rock fragments of all sizes embedded in a mixture of turbulent gas and ash racing down slopes.

Semeru (East Java, Indonesia): (8 Oct) Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 14000 ft (4300 m) altitude or flight level 140 .
The full report is as follows: DISCRETE VA TO FL140 OBS MOV W AT 08/2040Z OBS VA DTG:08/2040Z to 14000 ft (4300 m)

Dukono (Halmahera): (9 Oct) The explosive eruption at the volcano continues.
The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) local observatory reported an eruption from the volcano at 14:27 local time yesterday. A thick grey-to-black ash column rose to an altitude of 6,000 ft (1,829 m) and drifted east.
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In order to mitigate risk, people are advised to avoid the area within a radius of 2 km from the crater.

Sangay (Ecuador): Volcanic Ash Advisory Center Washington (VAAC) issued the following report: VA OBS AT 09/1452Z

Reventador (Ecuador): Volcanic Ash Advisory Center Washington (VAAC) issued the following report: VONA RPT VA EM 09/1848Z

Sabancaya (Peru): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Buenos Aires warned about a volcanic ash plume that rose up to estimated 26000 ft (7900 m) altitude or flight level 260 and is moving at 20 kts in SW direction.
The full report is as follows: CONTINTUOUS EMISSIONS to 26000 ft (7900 m)

Ubinas (Peru): (8 Oct) Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Buenos Aires warned about a volcanic ash plume that rose up to estimated 21000 ft (6400 m) altitude or flight level 210 and is moving at 10 kts in N direction.
The full report is as follows: NO NEW EMISSIONS to 21000 ft (6400 m)

Volcano Activity Summary for 9 Oct 2023:

Another lava flow from the North Crater as seen this morning via thermal camera (image: INGV)