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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
WI tour operators landing to help 12 minutes after eruption on 09.12.2019 - photo M. Schade

WI tour operators landing to help 12 minutes after eruption on 09.12.2019 - photo M. Schade

A more accurate record of the eruption on White Island was made by the Police:

Out of the 47 people on the island,

- 5 are confirmed dead,

- 31 are still hospitalized, 27 of whom burned on at least 30% of their body and with a vital prognosis for many of them, 3 were able to leave,

- and 8 are missing and presumed dead (including 6 identified bodies).

Since December 10 in the morning, seismic activity has remained low, but we continue to see periodic jets of steam and gas from the active ventilation zone. The volcanic alert level remains at level 3. The aviation color code remains orange.

Over the next 24 hours, we still estimate an equal probability of no eruption or a smaller / similar size eruption that would impact the floor of the main crater, based on our observations and measurements.

 

As for the eruptive mechanism: "The eruption and the resultant vapor, also known as hydrothermal or phreatic eruption, can occur suddenly and with little or no warning. The expansion of the water into steam is at a supersonic speed and the liquid can reach 1,700 times its original volume. This produces catastrophic impacts.

Expansion energy is sufficient to break solid rock, dig craters, and eject rock fragments and ashes hundreds of meters from the vent. We know sites in New Zealand where materials have been blown more than 3 km from the vent by such eruptions. "

 

Source: GeoNet Volcano Newsletter Dec 10 2019 16:20 local - and local media.

Vidéo White island eruption 09.12.2019 - by Michael Schade / RNZ

Back to the rest of the news after this day of 09.12 dramatic ...

 

In Kamchatka, experts from the Kamchatka branch of the Russian Expert Council on Seismic Prediction, Seismic Risk and Risk Assessment (KF RES) concluded that the probability of an Avachinsky eruption during the month next has been increased. The conclusions are based on a set of geophysical and seismological data obtained in the Kamchatka branch of the Geophysical Service of RAS (KF Fitz EGS RAS).

On December 9, nighttime glow was observed on a crack.

The Avachinsky is located about thirty kilometers from Petropavlovsk. Its last eruption was in 2001 (GVP)

 

Source: Kam 24
 

News of White Island, Avachinsky, Sabancaya and Nevados de Chillan.
Sabancaya- plume rising to 4.200 meters on the 08.12.2019 / 11h36 - webcam IGPeru

Sabancaya- plume rising to 4.200 meters on the 08.12.2019 / 11h36 - webcam IGPeru

The eruptive activity of the Sabancaya volcano between 2 and 8 December 2019 remained at moderate levels, with the recording of an average of 22 explosions a day, moderate, and the consequent emission of ashes at a maximum height 4,200 meters.

During this period, 1,255 earthquakes were recorded, as well as 4 thermal anomalies, between 1 and 12 MW.

 

For the following week, the presence of a lava dome inside the crater of Sabancaya volcano leads to present three possible scenarios:

Scenario 1: corresponds to a mild to moderate explosive activity such as that recorded by Sabancaya in recent years, associated, of course, with the slow growth or rise of the lava dome.

Scenario 2: Growth and collapse of the lava dome with generation of low volume pyroclastic flows.

Scenario 3: corresponds to effusive eruptions related to the location of lava flows.

In the event of volcanic explosions with ash emissions, they will disperse on December 9 to the western sector of the volcano with winds that reach 50 km / h. Between December 10th and 16th, the winds would scatter ashes to the southeast sector of the volcano with winds up to 50 km / h.

 

Source: I.G.Peru

Sabancaya - summary of the activity between 2 and 8.12.2019 - Doc. IG Peru

Sabancaya - summary of the activity between 2 and 8.12.2019 - Doc. IG Peru

In Chile, Nevados de Chillan continues its explosive activity, starting from four emission centers in the Nicanor crater, and effusive, without any known advance of the flows. The seismicity of the last 24 hours is moderate, and characterized by volcano-tectonic earthquakes, earthquakes LP (in relation with the explosions) and VLP and tremor.

 

Sources: Sernageomin & Onemi

Nevados de Chillan - map of risk areas updated on 08.12.2019

Nevados de Chillan - map of risk areas updated on 08.12.2019

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