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Earth of fire

Actualité volcanique, Articles de fond sur étude de volcan, tectonique, récits et photos de voyage

Publié le par Bernard Duyck
Publié dans : #volcanic activity
Popocatépetl - 01.17.2021 - photo © Thierry Sluys (accompanied by Dr. Robin Campion)

Popocatépetl - 01.17.2021 - photo © Thierry Sluys (accompanied by Dr. Robin Campion)

Popocatépetl - 01.17.2021 - photo © Thierry Sluys (accompanied by Dr.Robin Campion)

Popocatépetl - 01.17.2021 - photo © Thierry Sluys (accompanied by Dr.Robin Campion)

Popocatépetl - 01.17.2021 - photo © Thierry Sluys (accompanied by Dr. Robin Campion)

Popocatépetl - 01.17.2021 - photo © Thierry Sluys (accompanied by Dr. Robin Campion)

During the last 24 hours, thanks to the monitoring systems of the Popocatépetl volcano, 16 exhalations and 981 minutes of tremor have been identified, accompanied by emissions of water vapor, volcanic gases and small amounts of ash.

In addition, three minor explosions were recorded, two on January 16 at 12:41 p.m. and 4:51 p.m., and the last one on january 17 at 8:36 a.m. Visibility is partial, but allowed to observe a slight emission of water vapor, gas and a slight quantity of ash, which disperses towards the northeast.

CENAPRED urges not to go closer to the volcano and especially the crater, because of the danger posed by the fall of ballistic fragments and, in the event of heavy rains, to stay away from the bottom of the ravines because of the danger of mudslides and garbage. The Popocatépetl volcanic alert semaphore is Amarillo fase 2 .

 

Sources: Cenapred, webcams from Mexico City, and photos by Thierry Sluys, accompanied by Dr.Robin Campion.

Etna SEC - plume and lava flow towards Valle del Bove - 01.17.2021 / 10:06 am - INGV OE cam. therm. Emot

Etna SEC - plume and lava flow towards Valle del Bove - 01.17.2021 / 10:06 am - INGV OE cam. therm. Emot

 Etna - trémor on 01/18/2021 -Doc. INGV OE

Etna - trémor on 01/18/2021 -Doc. INGV OE

The National Institute of Geophysics and Volcanology, Etna Observatory, communicates that since around 06:40 GMT on January 17, 2021, surveillance cameras show a lava overflow produced by the eastern mouth of the Southeast Crater (SEC ). The overflow extends on the eastern flank of the south-eastern crater in the direction of the Bove Valley and currently the front is located at about 3000 meters at sea level. For the moment, the flow is advancing on the eastern base of the cone. of the Southeast Crater, probably invading one of the open mouths on December 24, 2018 at the start of the flank eruption.

Regarding the explosive activity at the summit craters, we observe a decrease in the frequency of Strombolian explosions by the SEC, while the intracratera activity at the craters of Voragine and Bocca Nuova remains almost unchanged. With regard to the volcanic tremor, its amplitude oscillates on average and high values, the source is located in the SEC area between 2.8 and 3 km above sea level.

The infrasonic activity in recent hours has shown no significant variation and is localized in the region of the SEC and Voragine. No significant change was recorded in the deformation signals acquired by the permanent GPS network.

 

Source: INGV OE and Boris Bencke

The Sinabung from Payung and the summit dome - 17.01.2021 / 17:14 WIB - photos Firdaus Surbakti via Beidar Sinabung
The Sinabung from Payung and the summit dome - 17.01.2021 / 17:14 WIB - photos Firdaus Surbakti via Beidar Sinabung

The Sinabung from Payung and the summit dome - 17.01.2021 / 17:14 WIB - photos Firdaus Surbakti via Beidar Sinabung

At Sinabung, the main crater plume was white and gray, thick, reaching about 50 to 500 meters above the summit.

Thanks to seismographic recordings of January 17, 2021, it was recorded:

- 3 eruption earthquakes, with an amplitude between 2 and 38 mm lasting 120 + 171 sec.

- 40 collapse / avalanche earthquakes

- 20 blast / emission earthquakes

- 4 low frequency earthquakes

- 5 hybrid / multiphase earthquakes

- 2 local tectonic earthquakes and 2 distant tectonic earthquakes.

 

At level 3 / siaga, the community and visitors / tourists are recommended not to carry out activities in the villages that have been moved, as well as within a radial radius of 3 km from the summit of G. Sinabung, and a sector radius of 5 km for the south-east sector and 4 km for the east-north sector.

 

Sources: PVMBG, Magma Indonesia and Beidar Sinabung

Merapi - 01/18/2021 / 5:43 a.m. - pyroclastic flow of collapse - photo PVMBG

Merapi - 01/18/2021 / 5:43 a.m. - pyroclastic flow of collapse - photo PVMBG

A pyroclastic flow of avalanche occurred on January 18, 2021 at 05.43 WIB in Merapi. It was recorded on the seismogram with an amplitude of 22 mm and a duration of 112 seconds. Distance of ± 1000 meters to the southwest (K Krasak) Column height observed at 50 meters above the summit. The wind was blowing from the southeast.

 

Source: BPPTKG

Soufrière de St Vincent - taking temp. at the FLIR thermal cam max ext. 590 °C - Doc. 01.16.2021 Dr. Adam Stinton, UWI Seismic Research Center

Soufrière de St Vincent - taking temp. at the FLIR thermal cam max ext. 590 °C - Doc. 01.16.2021 Dr. Adam Stinton, UWI Seismic Research Center

At La Soufrière in St Vincent, during the field visit on January 16, Dr. Adam Stinton took photos of the dome with a thermal camera: on a growing area, the max. was 590.8 ° C… the internal temperatures must be higher, which justifies a night incandescence. An expanse of burnt vegetation was observed in the western section of the crater floor, extending outward from the dome.

The lava dome continued to spread laterally and increase in height with its top now being marked by a small outgassing circular depression. The most active gas emission areas were reported as the contact areas between the preexisting 1979 dome and the 2020-21 dome, as well as the top of this new dome.

The alert level remains at Orange.

The volcano continues to extrude magma to the surface and the vapor can still be observed from the Belmont Observatory. People living in areas near the volcano should expect strong sulfur smells for several days or weeks, depending on changes in wind direction.

The National Emergency Management Organization reminds the public that no evacuation order or evacuation notice has been issued. NEMO continues to call on the public to refrain from visiting the Soufrière volcano, especially entering the crater, as this is extremely dangerous.

 

Sources: UWI-SRC 1 NEMO

Activity of Popocatépetl, Etna, Sinabung, Merapi and Soufrière SVG
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