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
 Peteroa - 22.02.2019 / 11h32 - webcam CNEA-SEGEMAR

Peteroa - 22.02.2019 / 11h32 - webcam CNEA-SEGEMAR

The superficial activity of Peteroa has continued in Chile since the beginning of February. The gray plumes, with a maximum height around 2,000 meters above the crater testify to the presence of ash, and of a volcanic system open in the superficial part of the volcano.

This February 22, plumes, more or less laden with ashes, were observed throughout the day.

As part of the current activity, we could continue to record explosions, possibly more intense, which justifies the maintenance of the amarillo alert level / changes in the behavior of volcanic activity in terms of weeks or months.

Source: Sernageomin and CNEA-Segemar

Peteroa - 22.02.2019 / 14h22 - webcam CNEA-SEGEMAR

Peteroa - 22.02.2019 / 14h22 - webcam CNEA-SEGEMAR

At the Piton de La Fournaise, the observations made during an overflight on the 22nd of February in the morning of the eruption zone, by a member of the OVPF, show that the contour of the flow has slightly changed even if its propagation is slow. The eruptive cone continues to grow and is now occupied by a lava lake from which ejecta escape during the explosion of bubbles arriving at the surface.

Piton de La Fournaise - the active cone and the beginning of the flow - photo Mon Ami / Imazpress

Piton de La Fournaise - the active cone and the beginning of the flow - photo Mon Ami / Imazpress

A well-channeled flow escapes downstream of the cone. After 1 km (and 200 m of negative elevation) it is no longer one but two lava arms that are observable. The separation of the flows is at the level of Guyanin crater.

The longest arm has traveled a distance of 1900 m from the eruptive vent and is still 4.3 km from the road and 5.3 km from the ocean. The different stream fronts are currently in the Great Slopes.

This toponym is related to the inclination of the topography which exceeds 30%. If and / or the lava arms have yet to advance, they will meet in 1.7 km of the lower slopes of between 10 and 20%, and in this case, without increasing flow, their progress should slow down.

Piton de la Fournaise - reverberation on the clouds, with a shooting star as a bonus - photo 974.photography réunion, from the lava road

Piton de la Fournaise - reverberation on the clouds, with a shooting star as a bonus - photo 974.photography réunion, from the lava road

Over the last 36 hours, 22 superficial superficial volcano-tectonic earthquakes (above sea level) have been recorded.

After a deflation of the building related to magma transfer that occurred on 18/02/2019, the deformations of the summit zone do not show any particular signals.

The CO2 concentrations in the near field soil (volcano deposit area) remain high.

Over the last 36 hours, surface flows estimated from satellite data, via the HOTVOLC platform (OPGC - University of Auvergne), were between 2.5 and 15 m³ / s. The amount of lava emitted since the resumption of activity on 19/02/2019 is between 1 and 3 million cubic meters.

Source: OVPF

Find all the information related to the Piton de la Fournaise activity on the different media of the OVPF-IPGP:
- the website (http://www.ipgp.fr/fr/ovpf/actualites-ovpf),
- the Twitter account (https://twitter.com/obsfournaise?lang=en),
- and the facebook account (https://www.facebook.com/ObsVolcanoPitonFournaise/)

Agung - 22.02.2019 / 16h35 - photo Wisara Gunung Agung

Agung - 22.02.2019 / 16h35 - photo Wisara Gunung Agung

The Agung, on the island of Bali, presented yesterday February 22 at 16:31 WITA an eruptive episode: it was accompanied by a gray plume at 300 - 700 meters above the summit, inclined to the East. On the seismogram, it lasted 6 min. 20 sec. with a maximum amplitude of 11 mm.

For the day of 22.02.2019, the PVMBG reports 2 eruption earthquakes, 4 breath earthquakes, and one episode of harmonic tremor.

The activity level remains at 3 / siaga.

Sources: PVMBG & Magma Indonesia

Agung - 22.02.2019 / 17h02 - activity summary of the day - mentioned authors

Agung - 22.02.2019 / 17h02 - activity summary of the day - mentioned authors

Next advanced course: "Monitoring volcanoes and magma movements".

The course will deal with magma movements in volcanoes and how they can be derived from ground and satellite monitoring techniques, including studies of earthquakes, soil deformation, and volcanic gas release. Case studies are presented.

Module 1: Introduction, Volcanic Plumbing Systems and Volcanic Seismology.

Module 2: Volcanic geodesy.

Module 3: Magma, volcanic gas and eruptions.

Module 4: Models of volcanic deformation

Module 5: Case Studies of Volcanic Disorders and Volcanic Eruptions.

Module 6: More case studies and summary.

 

Headed by the University of Iceland, with F.sigmundsson, H.Geirsson, P.Einarsson / all three of the Univ.of Iceland, E. Ilynskaya / Univ.Leeds, M.Poland / YVO - USGS, K.Jonsdottir / IMO

 

The duration of the course: 6 weeks, at a rate of 2-3 hours / week.

Price: FREE - Add a Verified Certificate for $ 50 USD

Further information and registration on: https://www.edx.org/course/monitoring-volcanoes-and-magma-movements

Commenter cet article

Articles récents

Hébergé par Overblog