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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
La Palma Cumbre Vieja - the eruptive site on 09/28/2021 - photo of the INGV teams as reinforcements.

La Palma Cumbre Vieja - the eruptive site on 09/28/2021 - photo of the INGV teams as reinforcements.

The volcanic tremor of the Cumbre Vieja eruption in La Palma remained constant at a level similar to the early days. This is consistent with the continuous and regular emissions of lava and ash that were observed throughout the day on September 28. They were accompanied by a plume reaching an altitude of 5,000-6,000 meters.

The advancing lava on September 28 caused the emission of poisonous gases when it encountered greenhouses and fertilizer stocks on a farm.

The eruptive plume generated gravity waves in the atmosphere, caused by a strong temperature inversion.

 La Palma / Cumbre Vieja - trémor au 29.09.2021 / 03h45 - Doc. IGNes

La Palma / Cumbre Vieja - trémor au 29.09.2021 / 03h45 - Doc. IGNes

La Palma Cumbre Vieja - 09.28.2021 - Lavas have encountered a banana growing area, with burning of greenhouse plastic and fertilizers, adding to the cloud of pollution. Doc. TVC

La Palma Cumbre Vieja - 09.28.2021 - Lavas have encountered a banana growing area, with burning of greenhouse plastic and fertilizers, adding to the cloud of pollution. Doc. TVC

La Palma - 09.28.2021 - the plume from the Cumbre Vieja eruption generated gravity waves in the atmosphere - photo by INGV)

La Palma - 09.28.2021 - the plume from the Cumbre Vieja eruption generated gravity waves in the atmosphere - photo by INGV)

At around 8 p.m., the vent located at the northwestern base of the cone reactivated, with fountaining reaching a height of about 100 meters, and a parallel increase in lava effusion.

The lava reached the sea around 11 p.m. local, at Los Guirres beach. After falling from the cliff, it formed a pyramidal deposit more than 50 meters high, and the arrival at sea was accompanied by black and white plumes. The population is invited to stay at least 3.5 km from where the lava enters the sea.

La Palma / Cumbre Vieja - 09.28.2021 / 11 p.m. loc. - arrival of lava at sea, view from the oceanographic vessel Ramon Margalef - @IEOoceanografia @CSIC

La Palma / Cumbre Vieja - 09.28.2021 / 11 p.m. loc. - arrival of lava at sea, view from the oceanographic vessel Ramon Margalef - @IEOoceanografia @CSIC

La Palma - arrival of the lava from Cumbre Vieja at sea on 09.28.2021 - photo Agence EFE / Ángel Medina y Miguel Calero

La Palma - arrival of the lava from Cumbre Vieja at sea on 09.28.2021 - photo Agence EFE / Ángel Medina y Miguel Calero

La Palma / Cumbre Vieja - 28.09.2021 - pyramid of lava deposited by the arrival of flows - Doc. Geociencias Marinas (IEO)

La Palma / Cumbre Vieja - 28.09.2021 - pyramid of lava deposited by the arrival of flows - Doc. Geociencias Marinas (IEO)

At the meeting of the lava, with a temperature higher than 1000ºC, with the sea, with a temperature of about 20ºC, a thermal shock occurs which generates plumes of water vapor charged with hydrochloric acid (HCl). These white plumes of water vapor also contain tiny particles of volcanic glass resulting from the reaction between lava and seawater.
These vapor columns, acidic in nature, represent a local danger - well defined - for people who visit or are in the coastal area where this meeting between lava and sea takes place.

In the process, it cut the coastal road from Puerto Naos to Los Llanos; the journey between the two localities, which was about twenty minutes, will drop to 2 hours, because we will have to go around the tip of the island today.

 

Sources: IGNes, RTVC, Copernicus, Volcanes y Ciencia Hoy, INGV

Askja - Sentinel-1 interferogram (July 31 - September 23) shows inflation of 12 cm - Doc. A. Nobile / Twitter 28,09,2021

Askja - Sentinel-1 interferogram (July 31 - September 23) shows inflation of 12 cm - Doc. A. Nobile / Twitter 28,09,2021

In Iceland, according to the Sentinel-1 interferogram (July 31 to September 23), inflation continues in Askja at a constant rate, reaching 12 cm. The bad weather did not allow good measurements the following days.

 

Source: A. Nobile / Twitter

Reykjanes peninsula - seismic swarm of September 28 and 29, 2021 - Doc IMO September 29, 2021 / 07:50
Reykjanes peninsula - seismic swarm of September 28 and 29, 2021 - Doc IMO September 29, 2021 / 07:50
Reykjanes peninsula - seismic swarm of September 28 and 29, 2021 - Doc IMO September 29, 2021 / 07:50

Reykjanes peninsula - seismic swarm of September 28 and 29, 2021 - Doc IMO September 29, 2021 / 07:50

Fagradalsfjall - tremor at 29.09.2021 - Doc. Hraun.vedur.is

Fagradalsfjall - tremor at 29.09.2021 - Doc. Hraun.vedur.is

A small seismic swarm was recorded by IMO in the Reykjanes peninsula on September 28-29. The two largest earthquakes measured 2.5, one last night and the other just before seven this morning. The earthquakes are at a reasonable depth, about 6 to 7 kilometers deep.

At Fagradalsfjall, no significant variations in the tremor. No change in the deformation data or signs of turbulence is observed.

 

Sources: Icelandic Met Office & RUV

The Linda Project - Building Wakanda ForUs By Us

The Linda Project - Building Wakanda ForUs By Us

The LINDA Project for the Goma Volcanic Observatory

 

LINDA means "PROTECT" in Swahili.

The LINDA PROJECT is a community solution providing a sustainable safety net to the Goma Volcano Observatory (OVG) to accomplish its main mission: to monitor Nyiragongo, Nyamuragira and Lake Kivu.

The project is supported by the diaspora, academic, technological and business communities who come together to own the problem and be the solution.

The LINDA PROJECT is based on the idea that solutions rooted in the targeted community are the most resilient. You always win when the key stakeholder takes ownership, invests time, energy and resources to improve the infrastructure that protects their families, friends and businesses.

 

Source: Linda Project https://www.lindaproject.org/?lang=fr / via Charles Balagizi.

LINDA means "PROTECT" in Swahili. LINDA PROJECT is a community-based solution providing a sustainable safety net for the Goma Volcano Observatory (OVG)

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