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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 - 18.02.2019 - the high-rise lava fountains and the flows in the steep slope - photo Jérôme Balleydier via Fournaise info

Piton de la Fournaise - 18.02.2019 - the high-rise lava fountains and the flows in the steep slope - photo Jérôme Balleydier via Fournaise info

The eruption started on February 18, 2019 at 9:48 am local time at Piton de La Fournaise continued, with a slight drop in tremor intensity observed since 14:45 local time (10:45 UTC). This drop in tremor may be linked to a drop in activity on one or other of the two cracks.

Surface flows estimated from the satellite data, via the MIROVA platform (University of Turin) and HOTVOLC (OPGC - University of Auvergne), were included at the beginning of eruption between 25 and 40 m3 / s, values ​​classically observed in beginning of eruption at Piton de la Fournaise.

The flows were visible from the Route des Laves, and the webcam of Piton Cascades.

Piton de La Fournaise - Evolution of the RSAM between 09h48 (05h48 UTC) and 16h15 (12h15 UTC) on 18 February on the seismic station of SNE. (© OVPF-IPGP)

Piton de La Fournaise - Evolution of the RSAM between 09h48 (05h48 UTC) and 16h15 (12h15 UTC) on 18 February on the seismic station of SNE. (© OVPF-IPGP)

Piton de La Fournaise - the castings remain visible in the evening of 18.02.2019 from the lave road - photo Dronecopter / J.Payet

Piton de La Fournaise - the castings remain visible in the evening of 18.02.2019 from the lave road - photo Dronecopter / J.Payet

Location of the eruptive site and webcams - the camera Piton Cascades, located on the extreme right, faces the flows - doc. Fournaise info / Google earth

Location of the eruptive site and webcams - the camera Piton Cascades, located on the extreme right, faces the flows - doc. Fournaise info / Google earth

Piton de La Fournaise - the flows seen by the Piton Cascades webcam around 15:39 UT, and after the official eruption stop - one click to enlarge - OVPF webcams
Piton de La Fournaise - the flows seen by the Piton Cascades webcam around 15:39 UT, and after the official eruption stop - one click to enlarge - OVPF webcamsPiton de La Fournaise - the flows seen by the Piton Cascades webcam around 15:39 UT, and after the official eruption stop - one click to enlarge - OVPF webcams

Piton de La Fournaise - the flows seen by the Piton Cascades webcam around 15:39 UT, and after the official eruption stop - one click to enlarge - OVPF webcams

The eruption stopped on 18/02/2019 at 22:00 local time.
Pouring remains nevertheless visible, but these will gradually cool down with the end of their feeding by the eruption.

No assumptions are made about the evolution of the future situation (definitive shutdown, resumption of activity on the same site, resumption of activity further downstream), given the persistence of seismicity.

Under these conditions, the prefect of Reunion has decided to go into the backup phase of the specific ORSEC * device of the Volcano Piton de la Fournaise, starting at 03:30 on Tuesday, February 19, 2019.


Despite the end of activity from the geophysical point of view and the stop of the feeding (end of the tremor, vibration associated with the path of the magma and the gases it contains), flows remain visible and will gradually cool down . As a result, the ban on access to the upper part of the enclosure remains in force until further notice pending the conclusions of the recognitions that will be made in the coming days.

 

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/)

Etna NEC - ash plume from 17.02.2019 - photo Gio Giusa

Etna NEC - ash plume from 17.02.2019 - photo Gio Giusa

Etna NEC - photo 18.02.2019 Gaetano Longo via Etna Like

Etna NEC - photo 18.02.2019 Gaetano Longo via Etna Like

The very favorable weather conditions - excellent visibility and little wind - allow us to see dramatically the ash emissions of the crater Northeast / NEC of Etna.

This is not a new eruption, as Boris Behncke explains, but intermittent ash emissions - almost exclusively old material derived from the central ducts - which have been going on since the beginning of January 2019."

Etna volcano activity: huge ash columns cause problems at Catania airport - by Turi Caggegi

Etna - the ash plume of the NEC seen from the roof of the Etna-Observatory in Catania this morning, February 18, 2019. The wind was pushing it westward, an unusual direction. - photo Boris Behncke

Etna - the ash plume of the NEC seen from the roof of the Etna-Observatory in Catania this morning, February 18, 2019. The wind was pushing it westward, an unusual direction. - photo Boris Behncke

The major problem of these ash emissions is that they put the staff of the Ingv Catania-Etna Observatory at great risk, because they represent a potential danger for the aircraft in flight in the area, so all days, sometimes even every hour, we need to change the state of alert for aeronautics (via the releases "Vona" / Volcano Observatory Notice for Aviation).

Thus, since last Thursday, February 14, we have already gone three times in the opinion of volcanological observatory for the aviation (notice of ash abundant in the atmosphere), to red level, to return every time after a few hours at the orange level.

These ash emissions led to the partial closure of Catania's Fontanarossa airport on 18 February, which carries 10 million passengers a year.

 

Sources: Boris Behncke and the photographers.

Anak Krakatau - photo 13.01.2019 / 12:31 - Rita Rosita / BNPB

Anak Krakatau - photo 13.01.2019 / 12:31 - Rita Rosita / BNPB

 Anak Krakatau - small thermal anomaly / 4MW spotted on 14.02.2019 by Mirova Modis

Anak Krakatau - small thermal anomaly / 4MW spotted on 14.02.2019 by Mirova Modis

In Indonesia, a white to thick gray plume is observed on February 18, about 500 meters above Krakatau; at the seismicity level, the PVMBG reports for the same day an eruption earthquake, three deep volcanic earthquakes and a distant tectonic earthquake.

 

Source: PVMBG

The Tengger caldera, with the cones of Batok and Bromo, with a plume tending toward the stars - photo 07.10.2016 by Kris Bednarzewski

The Tengger caldera, with the cones of Batok and Bromo, with a plume tending toward the stars - photo 07.10.2016 by Kris Bednarzewski

On East Java, the Bromo erupted on February 19, accompanied by a plume of ash rising 600 meters above the summit, according to the CVGHM, difficult to identify by satellites because of clouds; ash emissions continue.

An orange color code was issued by VAAC Darwin at 2:50, while Magma Indonesia mentioned a yellow at 1:10.

 

Sources: CVGHM, Magma Indonesia & VAAC Darwin

Merapi - the dome on 18.02.2019, respectively at 6h57, 8h26 and 14h21 - photos BPPTKG - one click to enlarge
Merapi - the dome on 18.02.2019, respectively at 6h57, 8h26 and 14h21 - photos BPPTKG - one click to enlargeMerapi - the dome on 18.02.2019, respectively at 6h57, 8h26 and 14h21 - photos BPPTKG - one click to enlarge

Merapi - the dome on 18.02.2019, respectively at 6h57, 8h26 and 14h21 - photos BPPTKG - one click to enlarge

At Merapi, still on Java, the avalanches of blocks remain numerous and lead in some cases to small pyroclastic flows, with displacement over 1,000 meters maximum towards the Gendol River.

The population must remain vigilant; for the moment, the level of activity remains at 2, without the need to evacuate.

 

Sources: BPPTKG, BNPB, PVMBG

Merapi - 18.02.2019 / 6:27 am - collapse accompanied by a plume and a small pyroclastic flow - photo BPPTKG

Merapi - 18.02.2019 / 6:27 am - collapse accompanied by a plume and a small pyroclastic flow - photo BPPTKG

Merapi - summary of the seismicity of 18.02.2019 / BPPTKG and seismogram / Magma Indonesia
Merapi - summary of the seismicity of 18.02.2019 / BPPTKG and seismogram / Magma Indonesia

Merapi - summary of the seismicity of 18.02.2019 / BPPTKG and seismogram / Magma Indonesia

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