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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
Kilauea - This view from the southern edge of Halema'uma'u shows the perched lava lake, fed by lava from the West Fissure (upper right part of the photo). The sea wall surrounding the active lava lake is approximately 5 m (16 ft) high. - USGS Photo by Mr. Patrick on April 13, 2021.

Kilauea - This view from the southern edge of Halema'uma'u shows the perched lava lake, fed by lava from the West Fissure (upper right part of the photo). The sea wall surrounding the active lava lake is approximately 5 m (16 ft) high. - USGS Photo by Mr. Patrick on April 13, 2021.

The Kīlauea volcano is erupting.

The lava outflow from the West Vent continues to feed the lava lake in Halema'uma'u Crater. The west vent constantly emits low flow lava through a crusted channel and a submerged inlet into the lake. Lava flow and intermittent crustal sinking continue in the western part of the lava lake, with lava seeping sporadically in areas along the perimeter of the lake. The total depth of the lake is 227 m. this April 14, 2021, measured by a continuous laser rangefinder on the active western part of the lake. Stagnant and solidified lava crust covers the eastern part of the lava lake and slowly grows westward.

The most recent sulfur dioxide emission rate, measured on April 8, was 1000 t / day. This is high compared to the rates for the months before the eruption started on December 20 (less than 100 t / day), but lower than the pre-2018 lava lake emission rates (around 5,000 t / day) .

The summit inclinometers have recorded minor changes over the past 24 hours. Seismicity remains stable, with high tremors.

The volcanic alert remains fixed at Watch, and the aviation code at orange.

 

Source: HVO

Geldingadalur - 04.04.2021 / 05h49 - RUV webcam

Geldingadalur - 04.04.2021 / 05h49 - RUV webcam

Reykjanes peninsula - map of active sites with their vents, trail layout - Doc. Óróapúls - Volcanism in Iceland 04.14.2021

Reykjanes peninsula - map of active sites with their vents, trail layout - Doc. Óróapúls - Volcanism in Iceland 04.14.2021

Experts from the Icelandic Meteorological Office carried out an overflight of the Geldingadalur / Meradalur eruptive site on April 13, revealing that the vents had increased to eight.
The eruptions are all on the same fissure and the fissure is still directly above the magma chamber in communication with the earth's crust since February, so a number of earthquakes have been observed in many parts of the southwestern part of the country.
The lava flow in Geldingadalur is constant, there is now around five to eight cubic meters of lava flowing per second and it has been so for quite some time. The eruptions that formed yesterday had no effect on the lava flow, according to an expert from the meteorological office.

Hiking trails A and B are still open, but soon hiking trail B will be left alone. From the time it started to erupt until midnight Tuesday, 41,923 have been to the eruption sites, according to the Icelandic Tourism Board.

Gases circulated in the greater Reykjavík area throughout the day, at concentrations of 100 to 600 μg / m³. Changing winds will begin to carry the gas westward around 5:00 p.m.

 

Sources: IMO, RUV, mbls, Óróapúls

Piton de La Fournaise - 04/13/2021 / 6:47 p.m. - webcm IRT / OVPF

Piton de La Fournaise - 04/13/2021 / 6:47 p.m. - webcm IRT / OVPF

The eruption that began at Piton de La Fournaise on 04/09/2021 at 7 p.m. (appearance of the tremor) continues. The intensity of the volcanic tremor (indicator of the intensity of the eruption) has increased steadily since yesterday morning to reach a level higher than that observed during the first hours of the eruption.

After five days of eruption, activity is not waning ... unfavorable weather conditions allowed only rare observations of the eruptive site. the explosive activity maintains two eruptive vents, a main one upstream, and one below with two contiguous vents animated by more modest activity. The intensity of the main lava fountain fluctuates, alternating phases of calm (~ 20m high) with more intense phases (80-100m high).

Piton de La Fournaise - 14.04.2021 / 07:40 UT - Piton de Bert camera / OVPF

Piton de La Fournaise - 14.04.2021 / 07:40 UT - Piton de Bert camera / OVPF

Over the last 24 hours, 16 superficial volcano-tectonic earthquakes (between sea level and the surface) have been recorded, all located under the summit craters.

The unfavorable weather conditions allowed only rare observations of the eruptive site. Since April 11, an increase in SO2 flows has been recorded on the NOVAC stations of the OVPFIPGP; the highest values ​​were recorded on April 13 with values ​​corresponding to flow rates> 30m³ / sec for non degassed magmas.

This increase in gas flow observed over the past few days can be explained by the presence at the start of the eruption of a more superficial and therefore more degassed magma. HOTVOLC form (OPGC - Clermont Auvergne University) could not be calculated today following the very bad weather conditions on the eruptive site.

Alert level: Alert 2-2

 

Source: OVPF

Piton de La Fournaise - 04/15/2021 / 02:15 GMT - Piton de Bert camera / OVPF

Piton de La Fournaise - 04/15/2021 / 02:15 GMT - Piton de Bert camera / OVPF

Seismic activity at La Soufrière in St. Vincent continued to follow the pattern established on April 13.
Tremor bands are seen approximately 14 hours apart, separated by swarms of small, long-lived earthquakes (LP).
The last tremor band occurred at around 11:35 a.m. and, as before, was associated with an episode of explosive activity.
The explosions produced were rich in gas, but did not increase as vigorously as the previous explosions.

Soufriere of St. Vincent - seismicity from 04.08 to 14.04.2021- Doc. UWI - one click to enlarge

Soufriere of St. Vincent - seismicity from 04.08 to 14.04.2021- Doc. UWI - one click to enlarge

Soufriere - eruptive plume of 04/14/2021 / 11:32 a.m. - UWI photo

Soufriere - eruptive plume of 04/14/2021 / 11:32 a.m. - UWI photo

The current pattern of explosions appears to be episodic (stop-and-go) with longer periods between explosions and less energy. Explosions and accompanying ash falls of a similar or greater magnitude will likely continue to occur over the next few days, as will possible pyroclastic flows.

This activity remains typical of Soufrière

 

Sources: UWI-SRC, NEMO SVG, Streva

Soufriere - duration of each of the documented eruptions, and their style. - Doc. Streva- one click to enlarge

Soufriere - duration of each of the documented eruptions, and their style. - Doc. Streva- one click to enlarge

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