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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
Piton de La Fournaise - the eruptive cone 04.01.2022 / 02h20 UT - webcam Piton de Bert 2 / OVPF

Piton de La Fournaise - the eruptive cone 04.01.2022 / 02h20 UT - webcam Piton de Bert 2 / OVPF

Piton de La Fournaise - observation of the lava flow - © OVPF-IPGP

Piton de La Fournaise - observation of the lava flow - © OVPF-IPGP

A team from the Volcanological Observatory was able to visit the eruptive site of Piton de la Fournaise on January 4. Observations still show lava fountain activity within the cone that has grown since the start of the eruption. ). The videos from the OVPF-IPGP-IRT webcams last night, as well as the observations made today near the vent, show activity with lava fountains which occasionally exceed the height of the cone. Overall, activity inside the eruptive cone appears to have decreased compared to yesterday. Numerous resurgences of lava flows are still visible at the roof of the lava tunnel that has developed downstream from the cone.

In the first hundred meters downstream of the eruptive cone, the thickness of the flow was estimated at about fifteen meters.

Piton de La Fournaise - eruptive cone and resurgences on lava flows - webcam Bert 04.01.2022 / 01h15 TU / OVPF

Piton de La Fournaise - eruptive cone and resurgences on lava flows - webcam Bert 04.01.2022 / 01h15 TU / OVPF

Piton de La Fournaise -: Evolution of the RSAM (indicator of a surface lava emission) between 12/21/2021 10:00 p.m. local time (6:00 p.m. UT) and 01/04/2022 3:07 p.m. (local time, 11:07 a.m. UT time on the FOR seismological station located at the level of the Château Fort crater (© OVPF / IPGP).

Piton de La Fournaise -: Evolution of the RSAM (indicator of a surface lava emission) between 12/21/2021 10:00 p.m. local time (6:00 p.m. UT) and 01/04/2022 3:07 p.m. (local time, 11:07 a.m. UT time on the FOR seismological station located at the level of the Château Fort crater (© OVPF / IPGP).

Over the last 24 hours the amplitude of the eruptive tremor (indicator of an emission of lava on the surface) still shows fluctuations while remaining generally stable. The average amplitude of the tremor is (over the last few days) about 55% of its initial amplitude.

Over the last 24 hours:

- Three volcano-tectonic earthquakes of low magnitudes (<1.0) were recorded under the summit.

- Surface deformations no longer show significant signals.

- The CO2 concentrations in the soil in the Gîte du volcan sector have become stable again for two days. This parameter will be monitored over the next few days because it may be linked to the arrival of new magma, coming from deeper areas, at the level of the shallow reservoir.

- Lava flows could be estimated by satellite method with the HOTVOLC platform (OPGC - Clermont Auvergne University). They were between 2 and 9 m3 / sec. These variations are explained by the method, which relies on the infrared radiation of the flow, the perception of which by satellites can be greatly influenced by the weather conditions above the flows as well as the surface conditions of the flows.

No precise assessment of the position of the casting front could be made. But given the relief with gently sloping slopes in the area, the lava field continues to extend mainly laterally and by thickening at the level of the network of lava tunnels set up on the plateau downstream of the eruptive cone.

 

Source: OVPF - press release 04.01.2022 / 4 p.m.

Fumaroles in the Fagradalsfjall lava field, where the lava plunges into Nátthaga; they constitute a normal post-eruptive phenomenon taking into account the atmospheric conditions - webcam mbls 04.01.2022

Fumaroles in the Fagradalsfjall lava field, where the lava plunges into Nátthaga; they constitute a normal post-eruptive phenomenon taking into account the atmospheric conditions - webcam mbls 04.01.2022

According to GPS measurements in the area of ​​the earthquake on the Reykjanes Peninsula, almost no changes were measured last week. This means that the magma hasn't moved much during this time.

Hulda Rós Helgadóttir, nature conservation specialist at the Icelandic Meteorological Bureau, says the magma intrusion is now about half as high as it was last spring when the eruption started in Fagradalsfjall. The top of the magmatic intrusion is at a depth of about half a kilometer. There it could solidify, but there is also a chance that it will shatter, and magma will rise to the surface.

Seismic activity has declined significantly in recent days, following strong activity in the first few days after it started on December 21. As the seismic activity had decreased during the days preceding the eruption of Fagradalsfjall, we cannot certify that the chances of leading to an eruption this time have diminished.

 

Source: Óróapúls - Volcanism in Iceland; via IMO & mbls.

Semeru - pyroclastic flow of collapse and ash plume of 05.01.2022 / 08:35 WIB - webcam PVMBG / Magma Indonesia

Semeru - pyroclastic flow of collapse and ash plume of 05.01.2022 / 08:35 WIB - webcam PVMBG / Magma Indonesia

In Semeru, in activity level 3 / siaga, an eruptive episode occurred this Wednesday January 5, 2022 at 08:35 WIB, accompanied by a plume of ash brown ashes observed at ± 1500 m above the summit (± 5176 m above sea level), and a small pyroclastic flow of collapse. This eruption was recorded on a seismograph with a maximum amplitude of 26 mm and a duration of 969 seconds.

 

Source: PVMBG, Magma Indonesia

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