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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 eruption started on August 11, 2019 around 16:20 (local time) at Piton de La Fournaise continues on August 14th. Despite rapid fluctuations, the intensity of the eruptive tremor (witnessing the intensity of the eruption) is relatively constant over the last 18 hours.

Activity of La Fournaise, Karymsky and Stromboli.

Since the beginning of the eruption, 63 volcano-tectonic earthquakes have been recorded:
- 31 August 11 from 17h to 24h.
- 7 August 12 from 00h to 24h.
- 6 August 13 from 00h to 24h.
- 19 August 14 from 00h to 24h.

4th day of eruption at Piton de la Fournaise - Uploaded by IMAZPRESS Réunion on 2019-08-14.

Because of the small inclination of the slopes in the area reached by the lava front on 13/08/2019, its progression is very slow, and the front is still located between 600-650 m altitude, a highly vegetated area ( near the Piton Tremblet), about 2 km from the road

Estimated surface flows from satellite data via HOTVOLC platforms (OPGC - University of Auvergne) and MIROVA (University of Turin) were around 2 m³ / s over the last 24 hours. This flow rate corresponds to a minimum flow, because the bad weather conditions on the volcano since the beginning of the eruption attenuate the satellite signals.

Piton de La Fournaise - Location of the eruptive fissures that opened on the 11/08/2019 and the approximate contours of associated lava flows. (© OVPF-IPGP / OPGC-LMV 14.08.2019).

Piton de La Fournaise - Location of the eruptive fissures that opened on the 11/08/2019 and the approximate contours of associated lava flows. (© OVPF-IPGP / OPGC-LMV 14.08.2019).

As the volcanologist Ludovic Leduc explains: " the most advanced front is no longer active ... the front stopped during the day around 600 m altitude, at the level of Pitons Tremblet (flow of April 2007). It is related to two main factors: the arrival of the lava in a less sloping littoral band, and the decrease of the flow ... when the flow decreases, the lava front ends up being no longer fed. It then solidifies, forcing the flow of lava behind (because there is still lava to arrive, but a little less) to take another path ... This forms a new flow that must start from higher ... A term, this builds what is called a lava field."- by Objectif Volcans

Piton de La Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) on August 15th on the seismic station NTR / Nez du Tremblet - Doc. OVPF

Piton de La Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) on August 15th on the seismic station NTR / Nez du Tremblet - Doc. OVPF

The eruption started on 11/08/2019 at 16:20 local time stopped today, the 15/08/2019 at around 04:20 local time.

The surface eruptive activity is currently stopped, the lava is no longer at the surface and the fountains have dried up ... only one remains degassing at the level of eruptive fissures and glare at the level of the lava flows which are during cooling.

No assumption is discounted as to the evolution of the future situation (final shutdown, resumption of activity on the same site, resumption of activity elsewhere), taking into account the following observables:

- a residual tremor is still recorded on the NTR station, located on the Nez Coupé du Tremblet.

- recording deep earthquakes that indicate that deep magma movements are still present.

So, Stop or resumption ?
 

In any case, La Fournaise will have " thrown more in the eyes "  with this 4th eruption 2019 !

 

Update 8.30am:
Resumption of eruptive activity at Piton de la Fournaise after a little over 4h break. Following the eruption stopped this morning at 4:20 am, the eruptive tremor resumed at 8:30. The activity of lava fountains resumed within the same eruptive cone.

In any case, La Fournaise will have thrown more eyes with this 4th eruption 2019! - photo RB / Imaz Press Reunion

In any case, La Fournaise will have thrown more eyes with this 4th eruption 2019! - photo RB / Imaz Press Reunion

Sources:

- 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/)

- Ludovic Leduc / Objectif Volcans

Karymsky - during an overview on 23.07.2019 - photo Olga Girina / IVS FEB RAS, KVERT

Karymsky - during an overview on 23.07.2019 - photo Olga Girina / IVS FEB RAS, KVERT

In Kamchatka, Karymsky presented on August 14 ash expolosins, accompanied by plume at 4,000-4,500 meters asl., then drifting to the south-west.

Moderate activity continues, and ashes are still observed by the Himawari-8 satellite on August 15 at 03h 00Z

The aviation code is orange.

 

Sources: KVERT, KSCNET & VAAC Tokyo

Karymsky - Volcanic ash advisory 15.08.2019 - Doc. VAAC Tokyo

Karymsky - Volcanic ash advisory 15.08.2019 - Doc. VAAC Tokyo

The activity of Stromboli during the week of August 5th to 11th has just been described in the INGV weekly bulletin.

In short, Strombolian explosive activity is characterized by an average of 19 to 22 hourly explosions (high average) and lava overflow.

It concerns two sectors: the northern sector, where at least 9 vents are active, 3 of which form well-defined slag cones with weak to medium strombolian activity; the south-central sector, which has a large cone of slag that emits explosions rich in ash.

Stromboli - north sector (left) with 9 active vents - south-central sector (right) with a large cone of slag - photo INGV

Stromboli - north sector (left) with 9 active vents - south-central sector (right) with a large cone of slag - photo INGV

The effusive activity by overflow of the south-central crateric terrace remained limited to the upper part of the Sciara del Fuoco.

Seismicity does not show significant variations, and there are no significant variations in deformation.

 

Regular Strombolian activity of ordinary intensity and discontinuous spattering are expected later, without being able to exclude explosions or stronger lava emissions.

 

Source: INGV Weekly Newsletter

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