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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
 Ili Lewotolok - 08.06.2021 / 6:50 p.m. WITA - Doc. PVMBG - KSEDM / Magma Indonesia

Ili Lewotolok - 08.06.2021 / 6:50 p.m. WITA - Doc. PVMBG - KSEDM / Magma Indonesia

Ili Lewotolok - seismicity at 07.06.2021 - Doc. Magma Indonesia

Ili Lewotolok - seismicity at 07.06.2021 - Doc. Magma Indonesia

The eruption of Mount Ili Lewotolok, East Nusa Tenggara continues, with this June 8, 2021 at 6:10 p.m. WITA, an explosion, accompanied by a column of gray and thick ash, observed at ± 500 m above the summit (at ± 1,923 m above sea level).

This eruption was recorded on a seismograph with a maximum amplitude of 4 mm and a duration of 30 seconds.

Communities around Mount Ili Lewotolok as well as visitors / climbers / tourists are recommended not to engage in activities within 3 km of the summit / crater of Mount Ili Lewotolok. The community of Jontona Village should always be aware of the potential threat of weathered material avalanches which may be accompanied by hot clouds originating from the southeastern portion of G. Ili Lewotolok peak / crater.

The activity level is 3 / siaga

 

Sources: PVMBG-KESDM & Magma Indonesia

Gareloi - 05.23.2021, and its persistent fumarole zone on the western edge of the south crater - AVO

Gareloi - 05.23.2021, and its persistent fumarole zone on the western edge of the south crater - AVO

A slight increase in seismic activity was observed at Gareloi volcano in the Aleutians on May 18, and from May 27 there was a sustained increase in the rate and size of small volcanic earthquakes.

Because the level of seismic activity is now higher than the background noise, the AVO increases the Aviation Color Code to YELLOW and the Volcanic Alert Level to ADVISORY. There have been no other noticeable changes to the volcano in satellite data or web camera views. Sulfur dioxide has been detected in satellite images from Gareloi over the past week and matches measurements of recent years. No activity was observed by an AVO field team flying over the summit on May 23.

The Gareloi volcano persistently emits magmatic gases from a field of fumaroles on the southern crater and generally exhibits low-level seismic activity. These observations suggest the presence of shallow magma and a potential interaction with a hydrothermal system. The current increase in seismicity likely reflects a change in the magmatic-hydrothermal system, but it is not clear that the likelihood of a volcanic eruption has increased. AVO will continue to monitor activity to determine if recent changes are related to the influx of new magma or other changes in the magma system.

Gareloi is monitored by a local seismic and infrasound network, satellite data and regional infrasound and lightning detection networks.

 

Source: AVO

Fagradalsfjall - numerous overflows at the active vent - photo this 08.06.2021 / 09.46.20 - new webcam mbls

Fagradalsfjall - numerous overflows at the active vent - photo this 08.06.2021 / 09.46.20 - new webcam mbls

The eruption continues at Fagradalsfjall, with numerous lava overflows at the only active crater, and in the Náttagha valley, smoke emissions at the lava front (wildfires?) Which block the view of the lava flowing down the slope in the valley.

Fagradalsfjall - numerous overflows at the active vent - photo this 06/08/2021 / 1:04 p.m. - new mbls webcam

Fagradalsfjall - numerous overflows at the active vent - photo this 06/08/2021 / 1:04 p.m. - new mbls webcam

Fagradalsfjall eruption, Nattagha Valley - Screen capture of the flow front with smoke masking the flows at the bottom of the valley / the car gives the scale - mbls webcam / screenshot 08.06.2021

Fagradalsfjall eruption, Nattagha Valley - Screen capture of the flow front with smoke masking the flows at the bottom of the valley / the car gives the scale - mbls webcam / screenshot 08.06.2021

Volcanologist Þorvaldur Þórðarson comments on the Fagradalsfjall eruption:

"... All types of basalt lava that existed on earth formed, without the productivity of the eruption changing to any extent.

If you think about the productivity of this rash, it was pretty consistent, only variability and no big changes.

However, we first see big changes in the behavior of the eruption in crater activity. We started off with some pretty weak gas bubbles that burst as they rose to the surface and splashed here and there and maybe tiny jets of magma. Then we switched to continuous magma jet activity for a while, then we switched to higher impulse activity where it happened in cycles, then we got very high magma jets and powerful. So now we are in the Spattering / Splash circle {...}

"We received confirmation of some theories and ideas, as with pyroclastic particles, they changed over time, their outer surface actually became more like glass when the activity of the magma jet was at its strongest. , but at first it was a much duller surface and not as well defined ", explains Þorvaldur. "Many years ago I put forward the idea that such a glazed surface of pyroclastic particles from such eruptions formed because hot gas circulated around the particles so quickly that they melted the shell. external. And that's exactly what they do, so I have confirmation of that. It's one of those funny things. "  -  (extracts from an interview with RUV)

 

Sources: RUV, mbls

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