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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

In Fagradalsfjall, the path leading to the observation point of the active cone, and prohibited from entering by the police, has still not been cut.

Fagradalsfjall - eruption on 06/03/2021 - the observation point is about to be surrounded by lava and transformed into a kipuka. Note: the yellow ribbon prohibiting access - - photo mbl.is / Einar Falur - - one click to enlarge

Fagradalsfjall - eruption on 06/03/2021 - the observation point is about to be surrounded by lava and transformed into a kipuka. Note: the yellow ribbon prohibiting access - - photo mbl.is / Einar Falur - - one click to enlarge

New measurements were taken yesterday, Wednesday June 2, when Garðaflug flew with the Hasselblad camera from the Institute of Natural History, and terrestrial models from Fagradalshraun have now been prepared.

The average lava flow over the period from May 18 to June 2 (15 days) is 12.4 m³ / s. This measure confirms that the increase in lava flows that occurred in early May continued. The lava flow in May was therefore twice as high as the average for the first six weeks.

The lava now measures 54 million cubic meters and the area of ​​2.67 square kilometers.

Current measurements show that there is no sign of slowing down, on the contrary, an increase over time. It is impossible to predict how long how long the rash will last, at this point.

 

Source: Univ. Iceland & al., RUV, mbls

Fagradalsfjall eruption - parameters as of 06/02/2021 / 3:20 p.m. (surface of the lava field, volume of lava emitted, discharge, geochemistry and gas flow) - Doc. Univ. Iceland et al. - one click to enlarge

Fagradalsfjall eruption - parameters as of 06/02/2021 / 3:20 p.m. (surface of the lava field, volume of lava emitted, discharge, geochemistry and gas flow) - Doc. Univ. Iceland et al. - one click to enlarge

In Nyiragongo, seismic data, recorded on June 2, 2021, indicates a continuous decrease in the number and magnitude of earthquakes (most of them are not felt); the direction is south, under the lake.

The GPS network always indicates a decrease in the travel speeds measured at the stations. The physical impossibility of installing seismic or GPS stations in the lake does not allow precise detection of a possible rise of magma under the lake. New satellite data recorded between May 27 and June 1 shows that the ground continues to deform south of the city of Goma, however at a much slower speed than at the start of the eruption. These deformations can still create or extend existing fractures in the soil.

Latest figures for material damage as of June 3:
- 1,267 residential buildings destroyed
- 914 unclassified buildings destroyed
- 4,866 inhabitants affected.

Although the authorities have not yet authorized a return to Goma, a movement of people returning to the city continues to be observed, in particular between Minova and the area of ​​origin of the displaced people.

 

Sources: Africa museum Georiska & OCHA RDC

Nyiragongo - co-eruptive deformation interferogram - doc. Cosmo Skymed via Adriano Nobile / Twitter

Nyiragongo - co-eruptive deformation interferogram - doc. Cosmo Skymed via Adriano Nobile / Twitter

HVO-USGS recorded a magnitude 4.0 earthquake located below the Lō'ihi Seamount, outheast of Big Island Hawaii on Wednesday, June 2 at 6:44 p.m. HST.

The quake was centered about 42 km (26 miles) southeast of Nāʻālehu, under the Lō'ihi Seamount at a depth of 11 km.

The alert level and the aviation code remain: unassigned.

Moderate shaking, with a maximum intensity of V on the modified Mercalli intensity scale, has been reported on the island of Hawaii. At this intensity, significant damage to buildings or structures is not expected.

According to HVO scientist Ken Hon, the earthquake had no apparent effect on Kīlauea or Mauna Loa volcanoes. "We are not seeing any detectable change in activity at the summits or along the Lōʻihi, Kīlauea or Mauna Loa fault zones as a result of this earthquake. Aftershocks are possible and could be felt" .

 

Source: HVO

Lō'ihi seamount - general bathymetry / USGS & summit crater bathymetry / MBARI - one click to enlargeLō'ihi seamount - general bathymetry / USGS & summit crater bathymetry / MBARI - one click to enlarge

Lō'ihi seamount - general bathymetry / USGS & summit crater bathymetry / MBARI - one click to enlarge

The first photos of the flows of the submarine volcano of Mayotte, in the Comoros, have just been published. They were carried out by the "ROV Victor 6000", deployed by the ship "Pourquoi pas", during the GeoFLAMME mission from April 17 to May 25, 2021.

This GeoFLAMME mission is based on the knowledge capitalized on during MAYOBS monitoring missions funded by different Ministries (MTE, MOM and MESRI) and aims to answer more upstream and / or fundamental scientific questions:

- understand the interactions between magmatism, tectonics and fluid emissions at the lithosphere scale on several spatial and temporal scales,

- understand the implications on the physico-chemical properties of the water column and the evolution of ecosystems,

- document the entire chain of interactions between volcanic products, magmatic gases, seawater circulations and the water column.

Images show entangled lava tubes, pillow lavas (fractured and emptied), fractured lava tubes. (photos April 25, 2021)

 

Sources: Ifremer, IPGP, ISTO Orléans, LVM-University of Clermont Auvergne, GEOPS, Paris Sud Orsay, LSCE, GET Toulouse, BRGM

The #Geoflamme mission leader reacts to the first images of the Mayotte volcano! - Ifremer video

Mayotte submarine volcano - shaped, fractured and emptied cushion lava - GeoFLAMME campaign 17.04.-25.05.2021

Mayotte submarine volcano - shaped, fractured and emptied cushion lava - GeoFLAMME campaign 17.04.-25.05.2021

Mayotte submarine volcano - entanglement of lava tubes - GeoFLAMME campaign 17.04.-25.05.2021

Mayotte submarine volcano - entanglement of lava tubes - GeoFLAMME campaign 17.04.-25.05.2021

Mayotte submarine volcano - fractured lava tubes - GeoFLAMME campaign 17.04.-25.05.2021

Mayotte submarine volcano - fractured lava tubes - GeoFLAMME campaign 17.04.-25.05.2021

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