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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
Villarica - 06.11.2020 / 07:57 loc. - photo @AngaritaV via Volcanologia Chile

Villarica - 06.11.2020 / 07:57 loc. - photo @AngaritaV via Volcanologia Chile

New explosions were recorded this 06.11 to 7.57 local time in the crater of the Villarrica volcano. This time, a pulsatile emission of pyroclastic material was reported, which lasted about 10 minutes, and which could be observed by residents of the sectors surrounding the volcano. The height of the plume was 350 meters max., With north-west dispersion. In addition, the SERNAGEOMIN reports that there was no seismic signal associated with the event and maintains the technical alert level in yellow.

A new ejection of particulate materials was reported at 14:12 local time, with no associated seismic signal. The height reached by the plume is about 250 meters.

Villarica - 06.11.2020 - Hot gases and glowing material from the morning explosion spread over the route usually taken to climb to the crater - Doc. POVI

Villarica - 06.11.2020 - Hot gases and glowing material from the morning explosion spread over the route usually taken to climb to the crater - Doc. POVI

Due to the surprise and the dangerousness of these explosions, - the hot gases and incandescent materials of the morning explosion spread on the road usually taken to climb to the crater - it is asked to follow the recommendation of the authorities not to not approach within a radius of 500 m around the crater.

 

The aforementioned explosive activity and the changes in the frequency content of the seismic signal would be linked to a partial clogging of the duct caused by a lower gas content in the magma column, which induces a decrease in its temperature and promotes the formation of a shell that acts as a partial plug. Once again the gas accumulates under the hull, it generates overpressures which cause surface explosions. It is suggested that the system still has the capacity to spontaneously generate activity with ballistic emission around the crater; similarly, larger and untimely climbs could be facilitated at current levels of volcanic activity.

It is pointed out that the state of the open conduit and the behavior of the fluctuating lava lake located near the surface can cause explosions that can affect the vicinity of the crater.

 

Source: SERNAGEOMIN & POVI

Sinabung - 07.11.2020 / 13h24 WIB - pyroclastic flow over 1,500 m. - photo Rizal

Sinabung - 07.11.2020 / 13h24 WIB - pyroclastic flow over 1,500 m. - photo Rizal

In Sinabung, two pyroclastic flows are mentioned for the day of November 7.

- The first at 01:29 WIB traveled 2,000 meters to the east southeast. Its footprint is 120 mm in amplitude, lasting 210 sec.

- The second is signaled at 13:24 WIB, with a sliding distance of 1,500 meters in an east-south-east direction. Its amplitude is 100 mm for 158 sec.

The activity level remains at 3 / siaga

 

Sources: PVMBG, Magma indonesia and BNPB

 Sabancaya volcano celebrates 4 years of continuous eruptive process with the recording of more than 37,000 explosions - one click to enlarge thumbnails Sabancaya volcano celebrates 4 years of continuous eruptive process with the recording of more than 37,000 explosions - one click to enlarge thumbnails Sabancaya volcano celebrates 4 years of continuous eruptive process with the recording of more than 37,000 explosions - one click to enlarge thumbnails
 Sabancaya volcano celebrates 4 years of continuous eruptive process with the recording of more than 37,000 explosions - one click to enlarge thumbnails Sabancaya volcano celebrates 4 years of continuous eruptive process with the recording of more than 37,000 explosions - one click to enlarge thumbnails

Sabancaya volcano celebrates 4 years of continuous eruptive process with the recording of more than 37,000 explosions - one click to enlarge thumbnails

The Sabancaya volcano celebrates 4 years of continuous eruptive process with the recording of more than 37,000 explosions (current eruptive period: November 6, 2016 - November 6, 2020 ... ongoing)


During these 4 years of eruptive activity, the northwest sector of the Sabancaya volcano has also deformed. This deformation was determined by the IGP by processing the data from the GNSS (Global Navigation Satellite System) stations and by analyzing the radar images. The deformation of the Sabancaya volcano would be associated with the stress generated by the magma during its ascent to the surface. This deformation was quantified at 20 cm, that is to say that the area located 9.5 km northwest of the crater, in these 4 years of eruptive process, rose 20 cm above from its base level.

The Geophysical Institute of Peru (IGP), through the National Volcanological Center (CENVUL), reported during these 4 years the occurrence of 37,338 volcanic explosions, (more than 40,800 for the Ingemmet) which were recorded by the seismometers, infrasound equipment and scientific cameras that make up the geophysical network for permanent real-time monitoring.

The eruptive columns reached a maximum of 5.5 km in height above the crater, causing ash falls, which affected the peoples settled in the Colca Valley. and other towns in Caylloma province within 35 km of the crater. Through the analysis of satellite images and field data, the IGP determined that the ash expelled by the Sabancaya during these 4 years covers an area greater than 1,308 km2, within an approximate radius of 20 km around the volcano crater.

 

Sources: I.G. Peru / Cenvul & Ingemmet-OVI - Press releases

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