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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 : #Actualités volcaniques
 Piton of La Fournaise - 08.02.2017 / 17h19 TU - webcam OVPF Piton of Bert

Piton of La Fournaise - 08.02.2017 / 17h19 TU - webcam OVPF Piton of Bert

The tropical storm Carlos will not have been right in the eruption of Piton de La Fournaise.
According to the OVPF, the volcanic tremor (surface eruptive intensity indicator) remains at a high level of intensity comparable to that seen at the beginning of the eruption (note that the higher values ​​recorded over the last 24 hours may be Influenced by wind and rain which disrupt the signals).
No seismicity was recorded during the day under the Piton de la Fournaise.
Concerning the long-term deformations, the tendency to a slight recovery of the inflation of the building seems to be clarified. This parameter will be followed and confirmed in the next few days.

Evolution of the RSAM (indicator of the volcanic tremor and intensity of the eruption) between January 31st and February 8th (5pm local time) on the seismic station of Château Fort, located on the southern flank of the volcano. (© OVPF / IPGP)

Evolution of the RSAM (indicator of the volcanic tremor and intensity of the eruption) between January 31st and February 8th (5pm local time) on the seismic station of Château Fort, located on the southern flank of the volcano. (© OVPF / IPGP)

The storm prevented field observations, but the processing of the COSMO-SkyMed radar satellite images (carried out by the OI2 platform - OPGC Clermont Ferrand) made it possible to carry out a mapping of the lava flow as it was at 07 February .
This technology and the applied treatment make it possible to identify the surfaces newly covered by the flows and to get rid of the presence of clouds. On the other hand, the resolution of the rendered contours is less than that of the treatments applied in aerial photographs. The length of the lava flows reached an extension of the order of 2,800 meters in eight days ... or at a relatively slow speed of about 15 meters per hour, and is located in the heights of the "Grandes Pentes". After the Broken of the Great Slopes, the lava should accelerate.
A survey conducted on the morning of February 8 by the air section of the gendarmerie and the PGHM confirms the position of the casting front in this sector.


Source: OVPF

Piton de La Fournaise - Outline of the lava flows at 07.02.2017, inferred from COSMO-SkyMed radar satellites. - Doc. OVPF

Piton de La Fournaise - Outline of the lava flows at 07.02.2017, inferred from COSMO-SkyMed radar satellites. - Doc. OVPF

In Etna, after a few days of strombolian activity animating the saddle between the two southeastern cones, this one evolved towards emissions of ashes, frequent on the morning of February 8th. During this active period, the trajectory of the tremor did not vary significantly.
 
Source: Boris Behncke and INGV Catania

Etna SEC - ashes emissions on 08.02.2017 - photo Boris Behncke

Etna SEC - ashes emissions on 08.02.2017 - photo Boris Behncke

Etna - trace of the tremor on 09.02.2017 / 8.14 - doc. INGV Catania

Etna - trace of the tremor on 09.02.2017 / 8.14 - doc. INGV Catania

In Hawaii, the site Epic Lava offers a compilation of the activity of 61g lava flow in the last six months.
The arrival of lava waterfall at Kamokuna has not changed in recent days, and there have been no signs of reconstruction of the previously existing lava delta.
 
Sources: HVO and EPIC LAVA

Hawaii / Kilauea /  61g lava flow : the lava waterfall is still powered on 08.02.2017 - photo HVO

Hawaii / Kilauea /  61g lava flow : the lava waterfall is still powered on 08.02.2017 - photo HVO

A photo taken by the Earth observing-1 / Advanced Land Imager of Nasa and illustrating the various vegetation stages of Kilimanjaro, allows us a good observation of the summit crater ... but also a confirmation of the drastic reduction of its ice cap in some years.

Kilimanjaro - seized by the satellite EO-1 Ali of the Nasa on 20.01.2017

Kilimanjaro - seized by the satellite EO-1 Ali of the Nasa on 20.01.2017

Removal of ice at the summit of Kilimanjaro - dates indicated on the photos and schemes. - a click to enlargeRemoval of ice at the summit of Kilimanjaro - dates indicated on the photos and schemes. - a click to enlarge

Removal of ice at the summit of Kilimanjaro - dates indicated on the photos and schemes. - a click to enlarge

Kilimanjaro - a spectacle more and more difficult to contemplate - photo Pierre Gondolff 2006

Kilimanjaro - a spectacle more and more difficult to contemplate - photo Pierre Gondolff 2006

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