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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
Anak Krakatau - 24.09.2019 / 08h44 - webcam PVMBG

Anak Krakatau - 24.09.2019 / 08h44 - webcam PVMBG

Anak Krakatau was erupted on 24 September 2019 at 08:43 WIB.

The height of the ash column was observed at ± 200 m above the summit (± 357 m above sea level). The column of ash was white to gray, thick and leaning northward. This eruption was recorded on a seismogram with a maximum amplitude of 5 mm and a duration of ± 38 seconds.

Currently, Anak Krakatau is at Level II Status (Alert) with the recommendation that people / tourists are not allowed to approach the crater within 2 km of the crater.

 

Source: PVMBG

Poas - plume of 23.09.2019 / 16h17 - webcam Ovsicori

Poas - plume of 23.09.2019 / 16h17 - webcam Ovsicori

Since 22 September 2019, the Poas volcano has been erupting continuously (see yesterday's article). The plume is 1,000 meters high (3708 m.a.s.l.).

The seismic activity is higher than yesterday.

The volcano experienced a hydrothermal eruption followed by frequent gas pulses at the time of writing this report. A peak of H2S / SO2 was observed before the eruption, but the CO2 / SO2 ratio increased slightly. There is no significant deformation.

 

Source: Ovsicori

 Poas - the crater lake has dried up, and the gas plume remains important - photo 23.09.2019 José Pablo Sibaja Brenes via M. Martinez / Ovsicori

 Poas - the crater lake has dried up, and the gas plume remains important - photo 23.09.2019 José Pablo Sibaja Brenes via M. Martinez / Ovsicori

The Geophysical Institute of Peru (IGP) reports that the eruptive activity of the Sabancaya volcano has remained at moderate levels, characterized by continuous explosions and the subsequent emission of ashes.

The analysis of records obtained from the seismic network of the Sabancaya volcano for the period from 16 to 22 September 2019 has identified the presence of about 2,282 earthquakes of volcanic origin, the highest percentage of which is associated with the movement of magmatic fluids inside the volcano.

During this week, they recorded an average of 24 medium to low intensity daily explosions. The plumes of gas and ash rise up to 2,500 meters above the summit, dispersed towards a south and surd-east sector.

Satellite monitoring identified 10 thermal anomalies with values ​​between 3 MW and 59 MW, associated with the presence of a hot body near the surface of the volcano crater.

The volcanic alert level remains orange, with an exclusion zone of 12 km radius around the crater.

 

Source: IG Peru

Sabancaya - summary of activity between 16 and 22.09.2019 - Doc. I.G.Peru

Sabancaya - summary of activity between 16 and 22.09.2019 - Doc. I.G.Peru

The Ubinas volcano continues its eruptive process. During the period from 16 to 22 September, the IGP recorded and analyzed a total of 4.356 seismic events, with a predominant volcano-tectonic (VT) type seismicity, related to fracking of rocks inside the volcano, with an average value of 567 events per day, all of a magnitude less than M2.5. Seismic signals that would be related to the rise of the magma (hybrid type) are also recorded, at the rate of 119 events per day.

The seismic activity and thermal anomalies that would be associated with the rise and nearness of magma near the surface. Likewise, gas emissions from magmatic sources and water vapor are observed thanks to surveillance cameras.

During this period, no volcanic explosion was recorded. The monitoring of the deformation of the volcanic structure using GNSS data (processed with fast orbits) does not show significant anomalies. MIROVA satellite monitoring recorded 4 thermal anomalies with values ​​ranging from 2 MW to 6 MW.

The level of volcanic alert remains orange, with a 10 km approach ban around the crater.

 

Source: IG Peru

Ubinas - summary of activities between 16 and 22.09.2019 - Doc. I.G.Peru

Ubinas - summary of activities between 16 and 22.09.2019 - Doc. I.G.Peru

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