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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

The resumption of activity on February 19th at 7:10 pm at Piton de La Fournaise continues on the 20th. The eruptive tremor is relatively stable since 6am local / 2h UTC.

Piton de la Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) between 09:48 (05:48 UTC) February 18 and 10:30 (06:30 UTC) February 20 on the seismic station of FLR. (© OVPF / IPGP)

Piton de la Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) between 09:48 (05:48 UTC) February 18 and 10:30 (06:30 UTC) February 20 on the seismic station of FLR. (© OVPF / IPGP)

Only one crack is active and the activity has built a cone rampart breached towards the lava flow.

Aline Peltier and Nicolas Villeneuve went on a field trip to collect lava samples, determine the debit and make temperature measurements.

According to volcanologists, the lava is at 1,200 ° C, and the gases are measured up to a temperature of 1,000 ° C. Despite the specific equipment, they were very hot!

As Aline Peltier explains, the absence of rapid deformation suggests a feeding of the activity by the magmatic intrusion of Monday 18. The analysis of the samples will tell us if we are dealing with two distinct eruptions or a same eruption.

Piton de La Fournaise - small cone of slag built around the fissural vent - photo Rando-Volcan / Benoît 20.02.2019

Piton de La Fournaise - small cone of slag built around the fissural vent - photo Rando-Volcan / Benoît 20.02.2019

Piton de La Fournaise - lava sampling on the current lava flow this 20.02.2019 by A.Peltier and N.Villeneuve - photo Imazpress

Piton de La Fournaise - lava sampling on the current lava flow this 20.02.2019 by A.Peltier and N.Villeneuve - photo Imazpress

In the evening, the incandescence is very noticeable on the Cascades webcam; Mirova notes a thermal anomaly of 1,357 Mw at 6:15 pm, a little stronger than that recorded at the beginning of the phase on 19.02 at 19:10, of 1.072MW.

The OVPF has recorded 5 volcano-tectonic earthquakes and inflation, testifying to the pressurization of a superficial source and a distant source, this 20 February.

Sources: OVPF, Objectif Volcans and Rando-Volcan.

Retrouvez l’ensemble des informations relatives à l’activité du Piton de la Fournaise sur les différents médias de l'OVPF-IPGP:
- le site internet (
http://www.ipgp.fr/fr/ovpf/actualites-ovpf),
- le compte Twitter (
https://twitter.com/obsfournaise?lang=fr),
- et le compte facebook (
https://www.facebook.com/ObsVolcanoPitonFournaise/)

Piton of La Fournaise - 20.02.2019 / 15h22 UTC - Cascades webcam / OVPF

Piton of La Fournaise - 20.02.2019 / 15h22 UTC - Cascades webcam / OVPF

Piton de La Fournaise - thermal anomalies on 20.02.2019 / 18h15 - Doc.Mirova - one click to enlargePiton de La Fournaise - thermal anomalies on 20.02.2019 / 18h15 - Doc.Mirova - one click to enlarge

Piton de La Fournaise - thermal anomalies on 20.02.2019 / 18h15 - Doc.Mirova - one click to enlarge

Piton de la Fournaise - field visit on 20.02.2019 - video Imazpress

Back on the eruption of February 18 ... for the pleasure of the eyes !

Eruption of February 18, 2019 (less than 24 hours of eruption). East sector on the outer slopes of the crater Dolomieu. Ben Celui Ci video

At Sheveluch ,on the Kamchatka Peninsula, explosive-extrusive eruption still results in strong fumarolic activity, intermittent explosions, prominent dome glow, and frequent pyroclastic flows accompanying dome block collapses. 

These different characteristics are illustrated by the recent images of Yuri Demyanchuk / Volkstat.

THE KVERT mentions an ash plume on February 21 at 4,500 meters above sea level, drifting westward for 62 km.

The aviation code remains orange.

 

Sources: KVERT & Volkstat - Sentinel 2 via Pierre Markuse / Twitter.

Sheveluch - 16.02.2019 - Y.Demyanchuk / Volkstat photos
Sheveluch - 16.02.2019 - Y.Demyanchuk / Volkstat photos

Sheveluch - 16.02.2019 - Y.Demyanchuk / Volkstat photos

Sheveluch - 19.02.2019 - Y.Demyanchuk / Volkstat photos

Sheveluch - 19.02.2019 - Y.Demyanchuk / Volkstat photos

 Sheveluch - Sentinel Nat colors image with IR highlghts from 19.02.2019 - image Copernicus / via P.Markuse - one click to enlarge

 Sheveluch - Sentinel Nat colors image with IR highlghts from 19.02.2019 - image Copernicus / via P.Markuse - one click to enlarge

At Etna, ash emissions from the northeast crater continue; a large surface of the summit snow is covered with these ashes, and quite distinct on the satellite images.

 Etna from Linguaglossa, with NEC emissions on 19.02.2019 - photo Gio Giusa

 Etna from Linguaglossa, with NEC emissions on 19.02.2019 - photo Gio Giusa

Volcanic ash, vapour, gas and clouds: Mt Etna volcano activity Time Lapse 20 feb 2019 - by Turi Caggegi

Etna in black and white on 20.02.2019 - photo Salvatore Lo Giudice

Etna in black and white on 20.02.2019 - photo Salvatore Lo Giudice

Etna in black and white on the image Sentinel 2 nat. colors on 19.02.2019 (snow, plume and ashes) - one click to enlarge

Etna in black and white on the image Sentinel 2 nat. colors on 19.02.2019 (snow, plume and ashes) - one click to enlarge

As the article by Boris Behncke and Marco Neri on the INGV Vulcani blog states, " the preliminary examination of the ashes fallen to the ground and taken at different times indicates that it is mainly" old "rocky materials, already present in the system of the central channels of the volcano. The fact that at present there does not appear to be any new magma rising to the surface is also confirmed by the amplitude of the relatively weak volcanic tremor, whose source is in a deeper position compared to the preceding weeks. the December eruption ".
 

Etna - emanations of SO2 on the Mediterranean this 19.02.2019 / 12:31 UTC - image Sentinel 5P via Annamaria Luongo

Etna - emanations of SO2 on the Mediterranean this 19.02.2019 / 12:31 UTC - image Sentinel 5P via Annamaria Luongo

Emissions of sulphurous gases, mainly sulfur dioxide, are noted on the move, on February 19, by the Sentinel 5P sensors to a northwestern sector, the Aeolian Islands and the Mediterranean.

Sources: INGV Vulcani, Sentinel 2, and the photographers mentioned

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