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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 - the new fissure and the lava flows in the slope - 20.02.2019 - photo rb / ipréunion

Piton de la Fournaise - the new fissure and the lava flows in the slope - 20.02.2019 - photo rb / ipréunion

We dropped the eruption of Piton de la Fournaise yesterday in the early evening - see article : http://www.earth-of-fire.com/2019/02/piton-de-la-fournaise-here-we-go-again.html
 

In the morning, the point is made by Nicolas Villeneuve in an interview with Imazpress: a crack opened yesterday at 1800 meters altitude on the east side of the Dolomieu, and an active fountain feeds two lava flows, whose forehead advances at a speed of about 1 km / h. The surface flows estimated from the satellite data, via the MIROVA platform (University of Turin) and HOTVOLC (OPGC - University of Auvergne), remain low and are between 3 and 7 m3 / s.

Piton de La Fournaise - new eruptive fissure  eastern flank of Dolomieu on 20.02.2019 - photo rb / ipréunion
Piton de La Fournaise - new eruptive fissure  eastern flank of Dolomieu on 20.02.2019 - photo rb / ipréunion

Piton de La Fournaise - new eruptive fissure eastern flank of Dolomieu on 20.02.2019 - photo rb / ipréunion

Piton de La Fournaise - 2019.02.20 PdF - Infrared shot of the eruptive site on 20.02.2019 at 06:20 local time. (OVPF-IPGP)

Piton de La Fournaise - 2019.02.20 PdF - Infrared shot of the eruptive site on 20.02.2019 at 06:20 local time. (OVPF-IPGP)

Piton de La Fournaise - part of the trail cut by the crack of the eruption of 18.02.2019, justifying the prohibition to enter the area - photo and notes of the OVPF / Twitter

Piton de La Fournaise - part of the trail cut by the crack of the eruption of 18.02.2019, justifying the prohibition to enter the area - photo and notes of the OVPF / Twitter

The first flow cuts the crater Madoré and stops upstream of the crater Guyana,forming a small lava lake.

The second arm descends the slopes to join the part of the Grand-Brûlé destroyed by the fire of January 2019. It spreads over 1,600 meters, and to continue towards the sea, depends on a sufficient supply upstream.

 

Sources: OVPF & Imazpress

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/)

Imazpress: http://www.ipreunion.com/volcan/reportage/2019/02/20/piton-de-la-fournaise-volcan-c-is-always-the-eruption.98049.html

Popocatépetl - 19.02.2019 - formation of the lava dome no. 82 - photos Cenapred / CNPC / Seguridad
Popocatépetl - 19.02.2019 - formation of the lava dome no. 82 - photos Cenapred / CNPC / Seguridad

Popocatépetl - 19.02.2019 - formation of the lava dome no. 82 - photos Cenapred / CNPC / Seguridad

An overview of Popocatépetl was conducted on 19 February, with the support of the Federal Police. It confirms the formation of a new dome, N° 82, with a diameter of 200 meters.


During the last 24 hours, thanks to the surveillance systems of the Popocatépetl volcano, 23 exhalations were identified accompanied by steam and gas, as well as an explosion at 06:13 h. In addition, six volcano-tectonic earthquakes were presented, the first three recorded yesterday at 12:20, 20:43 and 20:54, the other three today at 1:20, 09:55 and 09:56. , with a calculated magnitude of 1.8, 2.6, 2.1, 1.8, 1.5 and 1.4, respectively.

Similarly, during this period, 1140 minutes of seismic signal associated with low amplitude tremors were recorded with a different frequency spectrum; In addition, 240 minutes of harmonic tremors were detected from 5:00 am.

Source: Cenapred

Karymsky - area covered by ashes emitted by the activity of previous days - image Sentinel 2 nat. colors 19.02.2019

Karymsky - area covered by ashes emitted by the activity of previous days - image Sentinel 2 nat. colors 19.02.2019

 Karymsky - Volcanic ash advisory 19.02.2019 / 11:22 from VAAC Tokyo

 Karymsky - Volcanic ash advisory 19.02.2019 / 11:22 from VAAC Tokyo

In Kamchatka, Karymsky is the seat of moderate  eruptive activity, characterized by ash explosions. On February 18th, the KVERT recorded a plume of ashes between 2,500-3,000 meters asl., Drifting towards the ESE for 117 km.

The aviation code is orange, due to a possible continuation of explosive activity and plumes up to 4 to 6 km in height.

Source: KVERT and VAAC Tokyo

Villarica -the interior of the crater of Villarrica volcano, where a set of infrasonic sensors have been arranged - photo Volcanologia Chile 18.02.2019

Villarica -the interior of the crater of Villarrica volcano, where a set of infrasonic sensors have been arranged - photo Volcanologia Chile 18.02.2019

Researchers at the University of Conception led by volcanologist Jose Luis Palma next to a member of our team, installed inside the crater of Villarrica volcano a set of acoustic sensors capable of detecting infrasound (<20 hz ).

In addition, a topographic survey was carried out using a drone to reconstruct the crater's internal geometry.

Villarica - flying over the crater by drone - photo Volcanologia Chile 18.02.2019

Villarica - flying over the crater by drone - photo Volcanologia Chile 18.02.2019

Villarica - topographic surveys allowing a 3D image of the crater's internal geometry - image Nicolas Luengo / Volcanologia Chile Twitter

Villarica - topographic surveys allowing a 3D image of the crater's internal geometry - image Nicolas Luengo / Volcanologia Chile Twitter

The collection of infrasound acoustic data that is caused by the constant Strombolian activity (explosions of gas bubbles that are expelled from the lava lake) on open-duct volcanoes such as Villarrica has become an important tool for research and monitoring volcanic activity.
The cavity where the lava lake is stored acts in the same way as a wind instrument, where the tones change as the air volume changes. These analyzes, as well as the geometric characteristics of the duct, make it possible to obtain the depth of the lava lake with respect to the crater.

In addition, the magnitude and shape of the signals received provide information to correlate the magnitude of the explosions with the rate of expulsion of the emitted gases.
At this moment the lava lake lies beneath a solid crust that presents a small cone of slag, formed by the accretion and agglutination of lava splashes ejected during Strombolian explosions.

Sources: Volcanologia Chile, Nicolas Luengo.

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