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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
 Kilauea - Halema'uma'u - A cone of cool dark lava splash has built up around the fountain's vent and its turbulent outlet channel to the lava lake. - USGS photo taken by M. Zoeller on 01.12.2021 - One click to enlarge

Kilauea - Halema'uma'u - A cone of cool dark lava splash has built up around the fountain's vent and its turbulent outlet channel to the lava lake. - USGS photo taken by M. Zoeller on 01.12.2021 - One click to enlarge

Lava activity is confined to the Halemaʻumaʻu crater of Kilauea, with lava erupting from vents on the northwest side of the crater. This morning (January 12) the lava lake was about 196m deep below the west vents, while the stagnant eastern half of the lake was about 4m shallower. The eastern part of the lake seemed to have sagged beneath its perched edges. Overall, the size of the active and inactive parts of the lake has remained the same. The lake was still perched at least 1-2m above the inactive crust between the perched lake and the crater wall which was also rising.

On January 11, a low fountain supplied lava to an open channel that flowed into the lava lake.

On January 12, the active western fissure is visible; A dark and cool lava spatter cone has built up around the fountain's vent and its turbulent outlet channel to the lava lake, displaying more incandescence after the resumption of the lava fountain visible during of the weekend. The lava lake itself has a circulating western half, a stagnant half, and several islands; all this is surrounded by a perched dike which is now 1 to 2 meters high.

The declining SO2 emission rates are still high. The most recent measurements of the sulfur dioxide emission rate were 2,500 t / d on Monday January 11. 2021.

 

Source: HVO-USGS

Soufrière de St Vincent - 09.01.2021 - the dome in lateral expansion - UWI- SRC

Soufrière de St Vincent - 09.01.2021 - the dome in lateral expansion - UWI- SRC

At La Soufrière de St Vincent, no direct reconnaissance could be carried out on January 12 due to bad weather conditions.

The adventitious dome, which was put in place from December 27, 2020 against the existing dome, continues to grow; wedged between it and the crater wall, it expands laterally in a westerly direction.

Its shape has changed from round to ellipsoid. The vapors emitted are visible from the Belmont observatory.

The alert level remains orange.

 

Sources: NEMO (Nationam Emergency Management Organization) & UWI

Soufriere de St Vincent - the adventitious dome appears oval (darker) on the Sentinel image of 12.01.2021 / 9:51 am via Mounts. - One click to enlarge

Soufriere de St Vincent - the adventitious dome appears oval (darker) on the Sentinel image of 12.01.2021 / 9:51 am via Mounts. - One click to enlarge

La Soufrière Today: 12th Jan., 2021 UWI-SRC Geologist, Prof. Richard Robertson answers some of the recent questions we received from the public about the current effusive eruption at La Soufrière.

The Geophysical Institute of Peru reports that the eruptive activity of the Sabancaya volcano remained at moderate levels between January 4 and 10, 2021, with the continuous recording of explosions accompanied by plumes of ash and gas up to 3 km altitude above the summit of the volcano and their subsequent dispersion.

The IGP recorded and analyzed the occurrence of 1701 earthquakes of volcanic origin, associated with the circulation of magmatic fluids within the Sabancaya volcano. An average of 375 explosions were recorded daily of low to medium intensity. During this period, Volcano-Tectonic (VT) earthquakes associated with rock fracturing were located mainly in the North-East and South-East of Sabancaya and presented magnitudes between M1.9 and M2.8. The most representative earthquake (M2.8) was recorded on January 04 at 2:36 a.m., 11 km northeast of Sabancaya and 9 km deep.

The monitoring of the deformation of the volcanic structure using GNSS techniques (processed with fast orbits) does not show any significant anomalies. However, in general, inflation was observed in the south-eastern sector of Sabancaya and the northern sector (Hualca Hualca volcano).

Satellite monitoring has identified the presence of 2 thermal anomalies, with values ​​of 3 MW, associated with the presence of a lava dome on the surface of the volcano crater. A second lava dome has been reported, visible in the crater of the volcano.

Therefore, for the following days, no significant change is expected in eruptive activity. The volcanic alert level remains orange, with a prohibited area 12 km in radius around the crater

 

Source: I.G. Peru

Sabancaya - image radar Sentinel 10.01.2021 / 23h15 via Mounts

Sabancaya - image radar Sentinel 10.01.2021 / 23h15 via Mounts

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