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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 eruptive site and the flows 02.04.2020 - image © SAG - PGHM via OVPF

 Piton de La Fournaise - the eruptive site and the flows 02.04.2020 - image © SAG - PGHM via OVPF

Piton de La Fournaise - the eruptive site, its lava fountains and the flows 02.04.2020 - image © SAG - PGHM via OVPF

Piton de La Fournaise - the eruptive site, its lava fountains and the flows 02.04.2020 - image © SAG - PGHM via OVPF

The eruption that started on April 2, 2020 around 12:20 local time at Piton de La Fournaise continues.

Following the seismic crisis, no earthquake had been recorded. As Aline Peltier explains in an interview with LINFO. Re, this particular case of propagation without seismicity is to be related to an environment already weakened by the eruption of February 2020 and those of 2019, which took place on the same flank.

A second particular characteristic: the eruption started very quickly, in less than 2 days from the first warning sign, because very little magma had been emitted on the surface in February, making it available quickly. 

Piton de La Fournaise - Location map of the eruption tremor, 04/02/2020 between 1:15 p.m. and 1:30 p.m. (local time) (© OVPF / IPGP).

Piton de La Fournaise - Location map of the eruption tremor, 04/02/2020 between 1:15 p.m. and 1:30 p.m. (local time) (© OVPF / IPGP).

Piton de La Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) since 02/04/2020 00h on the seismological station DSO located at the top of the volcano. (© OVPF / IPGP).

Piton de La Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) since 02/04/2020 00h on the seismological station DSO located at the top of the volcano. (© OVPF / IPGP).

The intensity of the volcanic tremor (indicator of the intensity of the eruption) after an increase phase at the start of the eruption has been relatively stable over the past two hours. An overview of the SAG and the PGHM confirmed the opening of a crack on the eastern flank of the volcano about 1.7 km from the center of the Dolomieu crater at around 1900 m above sea level. This crack is located slightly below the eruption of February 10-16, 2020. During this overflight, the lava fountains did not seem to exceed 30m in height.

A significant signal of sulfur dioxide, with 31.37 DU, is observed by Tropomi above La Fournaise.

Piton de La Fournaise - 02.04. 2020- SO2 emission 0.32 kt - Sentinel-5 P Tropomi image - Doc. DLR / BIRA / ESA

Piton de La Fournaise - 02.04. 2020- SO2 emission 0.32 kt - Sentinel-5 P Tropomi image - Doc. DLR / BIRA / ESA

The estimated surface flows, from satellite data via the HOTVOLC platform (OPGC - University of Auvergne) are greatly disturbed by the bad weather conditions observed around Piton de la Fournaise. The rare measurements carried out, relate to flows of the order of 4 m³ / s but these are probably underestimated.

The Mirova site reports thermal anomalies on April 2 from 16 MW at 10:35 am, and 156 MW at 9:30 pm, attenuated by the clouds.

Piton de La Fournaise - Thermal anomalies on 02.04.2020 / 9:30 p.m. - Doc. Mirova MODIS_logVRP

Piton de La Fournaise - Thermal anomalies on 02.04.2020 / 9:30 p.m. - Doc. Mirova MODIS_logVRP

The island being in Covid-19 confinement, there are few images of the volcanophiles on the spot, the confirmation of the eruption was carried out by helicopter by the volcanologists thanks to the PGHM and the journalists of Imaz Press / http: // www.ipreunion.com/volcan,5/.

But you can still see some nice pictures on the webcams; to note: a beautiful pyrocumulus develops above the flows, seen from the webcam of Piton de Bert, in the evening.

 

Sources: OVPF / IPGP; Mirova; Sentinel-5 P Tropomi; ImazPress; Linfo.Re

Piton de la Fournaise - activity at 2:20 p.m., 2:46 p.m., 2:50 p.m. and 3:15 p.m. - OVPF webcams of Piton de Bert and Piton Partages - one click to enlargePiton de la Fournaise - activity at 2:20 p.m., 2:46 p.m., 2:50 p.m. and 3:15 p.m. - OVPF webcams of Piton de Bert and Piton Partages - one click to enlarge
Piton de la Fournaise - activity at 2:20 p.m., 2:46 p.m., 2:50 p.m. and 3:15 p.m. - OVPF webcams of Piton de Bert and Piton Partages - one click to enlargePiton de la Fournaise - activity at 2:20 p.m., 2:46 p.m., 2:50 p.m. and 3:15 p.m. - OVPF webcams of Piton de Bert and Piton Partages - one click to enlarge

Piton de la Fournaise - activity at 2:20 p.m., 2:46 p.m., 2:50 p.m. and 3:15 p.m. - OVPF webcams of Piton de Bert and Piton Partages - one click to enlarge

Piton de La Fournaise - incandescence of the eruptive site and formation of a pyro-cumulus - image capture 02.04.2020 / 6:47 pm - HD panoramic camera / copyright: IRT and IPGP-OVPF property

Piton de La Fournaise - incandescence of the eruptive site and formation of a pyro-cumulus - image capture 02.04.2020 / 6:47 pm - HD panoramic camera / copyright: IRT and IPGP-OVPF property

Second day of eruption on Piton de La Fournaise

Piton de La Fournaise - 03.04.2020 / 01h20 TU - OVPF webcam Cascades

Piton de La Fournaise - 03.04.2020 / 01h20 TU - OVPF webcam Cascades

Piton de La Fournaise - pyrocumulus over the lava flows on  03.04.2020 / 02h25 TU - OVPFwebcam Cascades

Piton de La Fournaise - pyrocumulus over the lava flows on 03.04.2020 / 02h25 TU - OVPFwebcam Cascades

In Vanuatu, the VGO signals an increase in the activity of Yasur, on alert 2 / major disorders on 2,3 and 4 April 2020.

Sometimes intense explosions with expulsion of projectiles and volcanic bombs in / and around the summit crater, and the emission of plumes of vapors and gases mark the volcano; the level of risk for visitors entering danger zone A (around the edge of the crater to the parking zone) remains increased.

Areas and villages in the southern part of Tanna can continue to expect ash falls and volcanic gas effects depending on the wind direction (currently northeast direction

 

Source: activity reports of the Vanuatu Geohazards Observatory of April 2 and 3.

Yasur - activity, respectively from April 2 at 8:30 am and 1:45 pm, and from April 3 at 9:15 am - Doc. VGO - one click to enlarge
Yasur - activity, respectively from April 2 at 8:30 am and 1:45 pm, and from April 3 at 9:15 am - Doc. VGO - one click to enlargeYasur - activity, respectively from April 2 at 8:30 am and 1:45 pm, and from April 3 at 9:15 am - Doc. VGO - one click to enlarge

Yasur - activity, respectively from April 2 at 8:30 am and 1:45 pm, and from April 3 at 9:15 am - Doc. VGO - one click to enlarge

The BPPTKG reports an eruption in Merapi / Java on April 2 at 3:10 pm WIB / 8:10 am Z. It was accompanied by a plume of gas and ash observed at about 3,000 meters above the summit, with a drift to the east. Its imprint on the seismogram is of an amplitude of 78 mm and a duration of 345 seconds.

The activity level remains at 2 / waspada, with a 3 km radius danger zone around the summit, and an orange VONA.

 

Sources: BPPTKG, PVMBG, Magma Indonesia

 Merapi - ash plume of 02.04.2020 / 3.10pm WIB - photo BPPTKG

Merapi - ash plume of 02.04.2020 / 3.10pm WIB - photo BPPTKG

Merapi - summary table of the activity of 02.04.2020 / 00h-24h WIB - Doc. PVMBG

Merapi - summary table of the activity of 02.04.2020 / 00h-24h WIB - Doc. PVMBG

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