Overblog
Editer l'article Suivre ce blog Administration + Créer mon blog

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 : #Actualités volcaniques

After the collapses in the Pu'u O'o crater and the increase in seismicity in the lower east rift zone, an eruption began on May 3, 2018, shortly before 5 pm local time on the Leilani Estates subdivision of Big Island / Hawaii.

Spatters and lava fountains were observed on the surface, and new fractures appeared at the end of the afternoon in the eastern part of the subdivision, from which white hot steam and bluish gases emanated.

The opening phases of the fissure eruptions are dynamic, and new vents and lava outbreaks can occur at any time, without knowing where they will fall into place.

Hawaii - An eruption blew this May 3 in Leilani Estates Subdivision in the Lower East Rift Zone of Kīlauea - Photo HVO - USGS

Hawaii - An eruption blew this May 3 in Leilani Estates Subdivision in the Lower East Rift Zone of Kīlauea - Photo HVO - USGS

HVO teams are on site and fly over to describe the type of activity and the direction of the lava flow.

The Civil Defense coordinates the necessary actions, including the evacuation of part of the Leilani subdivision. Residents of Puna District must remain alert, prepare and keep abreast of the situation.

Kilauea / Pu'u O'o - At 10:30 am HST on 03.05.2018, an earthquake with a magnitude of 5 is responsible for a pinkish plume at Pu'u O "o - HVO - USGS photo

Kilauea / Pu'u O'o - At 10:30 am HST on 03.05.2018, an earthquake with a magnitude of 5 is responsible for a pinkish plume at Pu'u O "o - HVO - USGS photo

At 10:30 am HST, an earthquake of magnitude 5 south of Pu'u O'o caused rock falls and a possible partial collapse in the crater.

Due to this unstable situation, the National Park management had closed an area of ​​more than 6,000 hectares near Pu'u O'o to the ocean, including the gravel evacuation route.

Update:

The fissure eruption lasted two hours; lava spread only a short distance, less than 10 meters.
Geologists report a strong presence of sulfur dioxide around the crack
At the moment of the state report of the HVO (04,05,2018 / 8:13 UTC), there is no more eruption on the crack. No other crack shows this activity in this rift zone.
Tiltmeters at the top of Kilauea continue to record deflation, and the level of the upper lava lake has dropped 37 meters in the last 24 hours.

Sources: HVO, NPS, local media

Kilauea - Lower Puna district - lava flow intersect a road - photos, above : HVO / under : HawaiiElectricLight /
Kilauea - Lower Puna district - lava flow intersect a road - photos, above : HVO / under : HawaiiElectricLight /

Kilauea - Lower Puna district - lava flow intersect a road - photos, above : HVO / under : HawaiiElectricLight /

Kilauea - after bad weather conditions, a thinning makes it possible to see the crater of Pu'u O'o on 03.05.2018 - photo HVO-USGS

Kilauea - after bad weather conditions, a thinning makes it possible to see the crater of Pu'u O'o on 03.05.2018 - photo HVO-USGS

 Kilauea - Zone closed by the NPS on 03.05.2018 - it will be necessary to add to it the zone of the eruption on the East rift zone - doc. NPS

Kilauea - Zone closed by the NPS on 03.05.2018 - it will be necessary to add to it the zone of the eruption on the East rift zone - doc. NPS

At Piton de La Fournaise, the eruption started on April 27, 2018 at 11:50 pm local time continues. The intensity of the volcanic tremor (indicator of eruptive intensity at the surface) is still relatively stable. The surface flows estimated from the satellite data, via the HOTVOLC platform (OPGC - Clermont Ferrand), recorded today were of the order of 1 m3 / s. It should be noted that these measures are only partial as a result of the bad weather conditions on the Fournaise massif during the last 24 hours.

A very slight deflation of the volcano continues to be recorded on the deformation sensors of the OVPF. This parameter will be followed in the next few days.

No volcano-tectonic earthquakes have been recorded in the past 24 hours under the Piton de la Fournaise building.

Piton de la Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) between 20:00 (16h UTC) on April 27th and 16h00 (12:00 UTC) on May 3rd at the BOR seismic station (located at Mountain peak). (© IPGP / OVPF)

Piton de la Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) between 20:00 (16h UTC) on April 27th and 16h00 (12:00 UTC) on May 3rd at the BOR seismic station (located at Mountain peak). (© IPGP / OVPF)

Field observations made at the beginning of the afternoon showed an evolution of the surface activity compared to the previous days:
* The activity is now focused mainly on the central mouth,
* The most upstream cone shows only sporadic activity,
* The cone around the active (central) mouth is now closed.
The end of the casting was in the clouds, and could not be observed.

The alert level remains: Alert 2-2 - Eruption in the Enclosure

Source: OVPF

Canary Islands archipelago - 03,05,2018 - seismic series between Tenerife and Gran Canaria started on April 29 - map IGN Spain

Canary Islands archipelago - 03,05,2018 - seismic series between Tenerife and Gran Canaria started on April 29 - map IGN Spain

Canary Islands archipelago - 03,05,2018 - seismic series between Tenerife and Gran Canaria started on April 29 - number of daily earthquakes - Doc. IGN Spain

Canary Islands archipelago - 03,05,2018 - seismic series between Tenerife and Gran Canaria started on April 29 - number of daily earthquakes - Doc. IGN Spain

A seismic swarm mark the maritime area between the islands of Tenerife and Gran Canaria, in the Canary Islands since late April.

Its origin is still discussed: magmatic origin at the level of Enmedio volcano, or tectonic origin in the fault separating the two islands, or a mixture of both.

The area was explored in 2015 by the IEO following a seismic crisis.

Sources: IGN Spain, IEO

Bathymetric map of the situation of the Enmedio volcano - doc.IEO

Bathymetric map of the situation of the Enmedio volcano - doc.IEO

3D image of Enmedio seamount - IEO image

3D image of Enmedio seamount - IEO image

Commenter cet article

Articles récents

Hébergé par Overblog