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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 - one of the eruptive episodes of 02.11.2022 / at 07:47 WITA - PVMBG Magma Indonesia webcam - one click to enlarge

Ili Lewotolok - one of the eruptive episodes of 02.11.2022 / at 07:47 WITA - PVMBG Magma Indonesia webcam - one click to enlarge

At Ili Lewotolok, on Lembata in Indonesia, the main crater plume is white and gray, about 100-1200 meters from the summit.

Ili Lewotolok - seismicity on 02.11.2022 - Doc. Magma Indonesia - one click to enlarge

Ili Lewotolok - seismicity on 02.11.2022 - Doc. Magma Indonesia - one click to enlarge

Seismicity is characterized by:
- 55 eruption earthquakes, with an amplitude of 17 to 42 mm and an earthquake duration of 26.5 to 163 seconds.
- 76 blast/emission earthquakes, with an amplitude of 5.8 to 17 mm and an earthquake duration of 18 to 86 seconds.
- 18 episodes of harmonic tremor, with an amplitude of 5 to 23 mm and an earthquake duration of 78.5 to 387 seconds.
- 34 episodes of non-harmonic tremor, with an amplitude of 5.9 to 22 mm and an earthquake duration of 52.5 to 295 seconds.
- 4 deep volcanic earthquakes
- 1 local tectonic earthquake and 4 distant tectonic earthquakes
- 4 episodes of continuous tremor with an amplitude of 0.25 to 13.7 mm, dominating 8 mm.

The activity level remains at III (Standby); communities around Mount Ili Lewotolok as well as visitors/climbers/tourists are recommended not to conduct 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 avalanches of weathered material which may be accompanied by hot clouds from the southeastern part of G. Ili Lewotolok peak/crater.

 

Source: Magma Indonesia

Etna SEC - 11.02.2022 / 4:33 p.m. - webcam Emot0331 INGV OE

Etna SEC - 11.02.2022 / 4:33 p.m. - webcam Emot0331 INGV OE

After the end of the paroxysmal activity reported yesterday, a weak and discontinuous intra-crateric explosive activity persists at the south-eastern crater of Etna, which produces a weak emission of ash, dispersed in the atmosphere in the north-eastern sector. west of the volcano.
The lava flow from the southeast crater appears to be depleted and cooling. The front reached an altitude estimated, from ground observations, at around 2,850 m above sea level, west of Monte Frumento Supino.

Etna SEC - 2022.02.11 / 09:50 UTC - cooling lava flows; ashes on the snow (on the left of the image) and deposits of pyroclastic flows and collapse (brownish zone on the right of the flows) - Doc. Copernicus Sentinel-2 - one click to enlarge

Etna SEC - 2022.02.11 / 09:50 UTC - cooling lava flows; ashes on the snow (on the left of the image) and deposits of pyroclastic flows and collapse (brownish zone on the right of the flows) - Doc. Copernicus Sentinel-2 - one click to enlarge

Etna SEC - 11.02.2022 - cooling lava flows; ashes on the snow (on the left of the image, in black on the snow in blue) and deposits of pyroclastic flows and collapse (brownish area on the right of the flows) - image Sentinel-2 SWIR - one click to enlarge

Etna SEC - 11.02.2022 - cooling lava flows; ashes on the snow (on the left of the image, in black on the snow in blue) and deposits of pyroclastic flows and collapse (brownish area on the right of the flows) - image Sentinel-2 SWIR - one click to enlarge

Relapses of pyroclastic material, produced by the paroxysmal activity, have been reported in the inhabited areas of the northwest quadrant of the volcanic edifice (in particular in Maletto) and up to the Tyrrhenian coast of Sicily, in S. Agata di Militello and Capo d'Orlando.
The average amplitude of the volcanic tremor currently shows a fairly stationary trend on average values ​​and sources located in correspondence with the central craters, at an altitude of approximately 2,800 m above sea level.

From 10:25 UTC, a thermal anomaly located at the southeast base of the SE crater at about 3,000 m altitude, at which a modest amount of ash is emitted.

Etna SEC - deep scar on the SE cone, left by the pyroclastic flows of February 10 - photo Boris Behncke 11.02.2022 / via INGV vulcani

Etna SEC - deep scar on the SE cone, left by the pyroclastic flows of February 10 - photo Boris Behncke 11.02.2022 / via INGV vulcani

Pyroclastic flows, clouds of gas and hyper-fast ash, were noticed during this paroxysm and in particular one 1500 meters long towards the south at 10:26 p.m. It was caused by the disembowelment of the southern flank of the Southeast Crater which today has a deep scar at this location! Impressive ! After the fifty paroxysms of 2021, the morphology of the Southeast Crater continues to change rapidly...

An impressive landslide movement affected the southeast crater on the morning of January 11.

The long plume of SO2 emissions from Etna's first 2022 eruption is moving eastward, reaching Greece, as detected on February 11 at 12:33 UTC by Copernicus Sentinel-5P

 

Sources: INGV OE & Sentinel / Copernicus

Etna- strong signal of SO2 at a distance of 792.9 km from Etna with 31.52 DU of SO2 at an altitude of about 10 km. Estimated mass within 300 km 0.5 kton. - image Sentinel- 5P Tropomi from 11.02.2022 / DLR / BIRA / ESA - one click to enlarge

Etna- strong signal of SO2 at a distance of 792.9 km from Etna with 31.52 DU of SO2 at an altitude of about 10 km. Estimated mass within 300 km 0.5 kton. - image Sentinel- 5P Tropomi from 11.02.2022 / DLR / BIRA / ESA - one click to enlarge

Etna SEC - crater and flows cooling on 12.02.2022 / 07:57 - webcam Emot0159 INGV OE

Etna SEC - crater and flows cooling on 12.02.2022 / 07:57 - webcam Emot0159 INGV OE

Etna SEC - eruption of 10.02.2022 - !! at 2'26 - video Michele Mammino

As of 8:00 a.m. HST on February 11, lava continues to erupt from the western vent into Halemaʻumaʻu Crater at the summit of Kīlauea Volcano. All recent lava activity has been confined to the crater, and there is no indication of activity migrating elsewhere on Kīlauea.
Since approximately 6:00 p.m. HST on February 10, outflow to the active lava lake in the western portion of Halemaʻumaʻu Crater has decreased significantly. This drop in activity is associated with a period of continued deflation at the top that began around the same time. The surface of the lava lake has dropped 10 m (33 ft) since the start of this period of deflation.

 

Source: HVO

Kilauea - Halema'uma'u crater on 07.02.2022.02.07, the effusive outlet feeding the active lava pond. - USGS photo by K. Lynn - one click to enlarge

Kilauea - Halema'uma'u crater on 07.02.2022.02.07, the effusive outlet feeding the active lava pond. - USGS photo by K. Lynn - one click to enlarge

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