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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

After a first seismic crisis recorded on September 7, but which lasted only 2 hours, a new seismic crisis has been recorded since 06:23 local time on 09.19.2022 at Piton de La Fournaise. This indicates that magma is leaving the magma reservoir and spreading to the surface.

Piton de La Fournaise - seismic crises on 09.19.2022 from 06:23 local time - Doc. OVPF - one click to enlarge

Piton de La Fournaise - seismic crises on 09.19.2022 from 06:23 local time - Doc. OVPF - one click to enlarge

The volcanic tremor synonymous with the arrival of magma on the surface has been recorded since 07:48 this day. The source of this tremor is located on the south-southwest flank, in the sector of the Rivals crater (located around 2200 m above sea level).

The eruption in the Enclosure poses no particular threat to the safety of persons, property or the environment.

Piton de La Fournaise - probable site of the eruption of 09.19.2022 - Doc.OVPF

Piton de La Fournaise - probable site of the eruption of 09.19.2022 - Doc.OVPF

Piton de La Fournaise / Fouqué enclosure - the Rivals crater (on the left, in the shape of a fortified castle) from near the Caubet crater - photo Dunog - one click to enlarge

Piton de La Fournaise / Fouqué enclosure - the Rivals crater (on the left, in the shape of a fortified castle) from near the Caubet crater - photo Dunog - one click to enlarge

Under these conditions, the prefect decided to trigger the 2-1 eruption alert phase in the Enclosure without any particular threat to the safety of people, property or the environment.

As a result, public access to the entire Piton de la Fournaise enclosure, whether from the Pas de Bellecombe trail or from any other trail, remains prohibited until further notice.

It is recalled that the landing of aircraft in the volcano area is regulated and subject to authorization from the Prefecture.

RN 2 remains open to traffic.

Piton de La Fournaise - Alert 2-1 - doc. Reunion Prefecture

No visual confirmation of a start of eruption could be made for the moment on the webcams due to bad weather conditions and we cannot confirm the arrival of the lava on the surface. Nevertheless the presence of a tremor shows the emission of hot and incandescent gases on the surface, and the possibility of lava emission in the short term.

 

Sources: OVPF and Reunion Prefecture

Find all the information relating to the activity of Piton de la Fournaise on the various OVPF-IPGP media: - the website: ipgp.fr/fr/ovpf/actualites-ovpf - the Twitter account: twitter. com/obsfournaise - the Facebook account: facebook.com/ObsVolcanoPitonFournaise

Sangay - Strombolian activity from 18.09.2022 / 00:59 ECU 911 IGEPN webcam - one click to enlarge

Sangay - Strombolian activity from 18.09.2022 / 00:59 ECU 911 IGEPN webcam - one click to enlarge

Sangay - image Sentinel-2 bands 12,11,8A from 18.09.2022 / 3:36 p.m. - via Mounts project

Sangay - image Sentinel-2 bands 12,11,8A from 18.09.2022 / 3:36 p.m. - via Mounts project

The surface and internal activity levels of the Sangay remain high and unchanged.

Seismicity is characterized by 817 explosion earthquakes, 2 LP earthquakes and 80 episodes of emission tremor.

In the past 24 hours, the Washington VAAC has published 3 reports of ash emissions reaching a height of up to 1470 meters above crater level and heading west.
The MOUNTS system returned 534.6. tons of SO2, measured on 09/17/2022 at 2:18 p.m. TL.

The FIRMS system records 13 thermal anomalies and the MIROVA system reports 3 anomalies, respectively moderate and high (509 MW and 441 MW on 18.09, and 1,030 MW on 19.09).


Thanks to images shared by ECU-911-MACAS, the volcano was clear overnight and early in the morning; an incandescence could be observed in the crater, associated with Strombolian activity of the volcano. Today's morning rose clearly observing a continuous emission of steam, gas and low ash content with heights up to 1500 meters above the summit drifting to the west.
Alert level - SNGRE: Yellow

 

Sources: IGEPN, Mirova, Mounts Project

Sangay - thermal anomalies on 19.09.2022 / 03:00 - Doc. Mirova_MODIS_Latest10NTI

Sangay - thermal anomalies on 19.09.2022 / 03:00 - Doc. Mirova_MODIS_Latest10NTI

Effusive volcanic activity at Home Reef continues, with 11 eruptive episodes in 24 hours as of September 16/1:46 p.m., and 9 episodes in 24 hours. September 17 / 8:21 p.m. UTC, 8th day since the start of the eruption.

They are accompanied by fumarolic activity and steam emitted more than 1,000 meters into the atmosphere.

The island is measured on September 15 at 182m. in the north-south axis and 173 m. in the east-west axis on an image from the WorldView-3 satellite; Its total area is about 6 acres / 24,280 m², and its height is estimated at 10 m. above sea level.

Maritime traffic must respect a 4 km exclusion zone. around Home Reef.

 

Source: Tonga Geological Services / Volcano Watch Team September 18, 2022.

Home Reef - 24 hour activity on 16 and 17.09.2022 - red dots represent vlcanic episodesDoc. VOLCAT - one click to enlarge
Home Reef - 24 hour activity on 16 and 17.09.2022 - red dots represent vlcanic episodesDoc. VOLCAT - one click to enlarge

Home Reef - 24 hour activity on 16 and 17.09.2022 - red dots represent vlcanic episodesDoc. VOLCAT - one click to enlarge

Home Reef - WorldView-3 natural color image from 09.15.2022 / 21:48 UTC - a scale helps to estimate the dimensions of the new USGS Digital Globe island - click to enlarge

Home Reef - WorldView-3 natural color image from 09.15.2022 / 21:48 UTC - a scale helps to estimate the dimensions of the new USGS Digital Globe island - click to enlarge

Home Reef - Risk map, zones 1 & 2 - Doc. TGS 15.09.2022

Home Reef - Risk map, zones 1 & 2 - Doc. TGS 15.09.2022

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