Overblog
Editer l'article Suivre ce blog Administration + Créer mon blog

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
Aerial view of active vents at Whakaari / White Island showing the column of dilute ash and the new crater surrounded by dark gray mud. Bright colors are hydrothermal minerals precipitated in the lake and on the ground - video clip 17.02.2022 by GeoNet - one click to enlarge

Aerial view of active vents at Whakaari / White Island showing the column of dilute ash and the new crater surrounded by dark gray mud. Bright colors are hydrothermal minerals precipitated in the lake and on the ground - video clip 17.02.2022 by GeoNet - one click to enlarge

On Thursday the 17th, GNS volcanologists conducted an observation flight over Wahkaari / White island. This confirmed that a small amount of brown ash was entrained in steam and gas venting from the active 2019 vent area. The dilute ash plume did not extend above the main crater wall. This is similar to many sightings this year from flights and web cameras.

The flight also confirmed that the area of ​​geyser activity recently seen on web cameras has turned into a shallow mud-filled crater. Features like this are not unusual and this one has formed where steaming and geyser activity has been noted in the past. Small scale steam explosions ejected mud which formed a small dark gray cone around the crater. A video clip showing the activity can be seen below.

Whakaari / White Island 17 Feb, 2022. video of active vent area.

FLIR thermal infrared data obtained during the flight established that high temperatures continue to be present in the gas and vapor feeding the active vent. A maximum temperature of 435°C was measured during the flight. A temperature of 172°C was recorded from a different vent in the 2019 area. The water level in the lake has dropped slightly over the past few weeks.

Overall, conditions remain similar to those seen in recent months, characterized by intermittent low ash emissions, elevated steam and gas temperatures from active vents, and variable lake levels. When the lake level is high, some vents may be flooded and the style of activity changes.

Volcanic Alert Level remains at 2
Aviation Color Code Remains Yellow

 

Source: GeoNet 23.02.2022

Etna SEC - Lava coulée on 02.22.2022 / 8:46 p.m. - webcam LAVE schiena

Etna SEC - Lava coulée on 02.22.2022 / 8:46 p.m. - webcam LAVE schiena

From 18:00 UTC around 22.02.2022, the improvement in weather conditions made it possible to observe from the surveillance cameras, the resumption of weak Strombolian activity at the level of the South-East crater of Etna, and a lava flow spreading along its eastern flank.

According to the forecast model, the volcanic cloud is dispersing in a southerly direction.
The average amplitude of the volcanic tremor does not show significant changes compared to what is reported in press release n. 549 and remains at medium-low levels. The springs are located in the Bocca Nuova crater area at a depth of about 1.5 km
above sea level. Infrasonic activity is weak, however the number of events could be underestimated due to the strong wind.
No significant change is observed in the deformation data measured by the GNSS network.

 

Source: INGV OE

Map of the summit craters of Etna based on the topographic DEM of 2014 elaborated by the Laboratory of Aerogeofisica - Section Rome 2. Shaded terrain model of the southeast crater and position and contours of the collapse of February 10, 2022 modified on the basis of Skysat satellite image from February 14. - Via INGV bulletin

Map of the summit craters of Etna based on the topographic DEM of 2014 elaborated by the Laboratory of Aerogeofisica - Section Rome 2. Shaded terrain model of the southeast crater and position and contours of the collapse of February 10, 2022 modified on the basis of Skysat satellite image from February 14. - Via INGV bulletin

A strong and constant degassing of the Santiaguito crater is observed, with a white and gray coloration, at a height of 500 meters above the Caliente dome which disperses in a west and southwest direction.

A strong incandescence is observed in the crater of the dome.

Thermal anomalies are indicated by Mirova between VRP 12 and 51 MW in recent days.

From dawn, avalanches are observed on the active lava flow, generating uplifts of fine particles.

The high activity of the volcano presents constant boulder avalanches around the volcanic edifice with the possibility of a slight fall of fine particles.

The high activity of the volcano presents constant boulder avalanches around the volcanic edifice with the possibility of a slight fall of fine ash particles in the villages of Loma Linda, San Marcos Palajunoj and others in this area.

Pyroclastic flows can be generated, so you should not stay near or in riverbeds near the slopes of the volcano.

 

Sources : INSIVUMEH, Mirova

Santiaguito - image Sentinel-2 bands 12,11,05 of 21.02.2022 - Doc. Insivumeh - one click to enlargeSantiaguito - image Sentinel-2 bands 12,11,05 of 21.02.2022 - Doc. Insivumeh - one click to enlarge

Santiaguito - image Sentinel-2 bands 12,11,05 of 21.02.2022 - Doc. Insivumeh - one click to enlarge

SantaMaria / Santiaguito - thermal anomalies as of 02.21.2022 / 4:49 p.m. - Doc. Sentinel-2 bands 12,11,8A & Modis thermal volcanic activity / Mirova

SantaMaria / Santiaguito - thermal anomalies as of 02.21.2022 / 4:49 p.m. - Doc. Sentinel-2 bands 12,11,8A & Modis thermal volcanic activity / Mirova

The GOES-16 satellite images show no anomalies on 2022-02-22 13:20 UTC (TL Galapagos -6HS) at Wolf Volcano / Galapagos.
At the seismic level: only one volcano-tectonic earthquake is mentioned by the IGEPN.
No VAAC alert or ash emission report was recorded.

WORLdVIEW records 171 thermal alerts at Wolf, in the last 12 hours MIROVA records very high thermal alerts, in the last 24 hours
During the night, the thermal anomaly recorded by the satellites was maintained.

 

Source: IGEPN

Galapagos / Wolf volcano - very high thermal anomalies on 02.23.2022 / 04:45 - Doc. Mirova _MODIS_Latest10NTI

Galapagos / Wolf volcano - very high thermal anomalies on 02.23.2022 / 04:45 - Doc. Mirova _MODIS_Latest10NTI

In Iceland, inflation continues on the Reykjanes peninsula in southwestern Iceland, reports Morgunblaðið.

The site of Fagradalsfjall and its lava field stand out well delimited on the snowy surface of the peninsula.

"Inflation originated at a considerable depth," says Benedikt Gunnar Ófeigsson, a deformation specialist at the Icelandic Met Office. Its center is somewhere in the area under the Fagradalsfjall mountain. It is difficult to locate precisely. What this probably indicates is that the magma is accumulating at a depth of about 12-16 km.

The Fagradalsfjall lava field is marked on the seasonal snow cover, indicating its residual heat - one click to enlarge
The Fagradalsfjall lava field is marked on the seasonal snow cover, indicating its residual heat - one click to enlarge

The Fagradalsfjall lava field is marked on the seasonal snow cover, indicating its residual heat - one click to enlarge

Icelandic Met Office scientists also continue to closely monitor inflation in other parts of the country, including the Askja volcano, north of the Vatnajökull glacier, and the Grímsvön volcanic system, below the Vatnajökull glacier ice cap. Inflation is an indication of volcano activity.

The M4.9 Bárðarbunga caldera earthquake on February 22 shows the same MT solution as previous post-eruption earthquakes. The joint interpretation of seismic and GPS data suggests that the volcano has been inflating since the spring of 2015. These periods of inflation can vary for decades without an eruption

 

Sources: Iceland Monitor & Kristín Jónsdóttir

Bárðarbunga - seismicity as of 02.22.2022 / 15:07 UTC - Doc. IMO via Kristin Jonsdottir - one click to enlarge

Bárðarbunga - seismicity as of 02.22.2022 / 15:07 UTC - Doc. IMO via Kristin Jonsdottir - one click to enlarge

Commenter cet article

Archives

Articles récents

Hébergé par Overblog