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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

Since 02:28 local time, a new seismic crisis has been recorded on the instruments of the Volcanological Observatory of Piton de la Fournaise. This seismic crisis is accompanied by rapid deformation.

This indicates that the magma is leaving the magma reservoir and is spreading towards the surface. An eruption is likely shortly within the next few minutes or hours.

Piton de La Fournaise - new seismic crisis 07.12.2020 / 02h28 - Doc. OVPF / IPGP

Piton de La Fournaise - new seismic crisis 07.12.2020 / 02h28 - Doc. OVPF / IPGP

The volcanic tremor synonymous with the arrival of magma near the surface has been recorded since approximately 4:40 a.m. local time.

Analysis of the data and observations from our cameras show that the eruptive fissure (s) have opened on the western flank of the volcano and that the first lava poured out around 04.55-05.00 local time.

Given the presence of hot and incandescent gases, and the emission of lava in progress, the Prefect decided to implement the alert phase 2-2 "eruption in progress in the enclosure" of the specific device ORSEC volcano this Monday December 7 at 5:30 am.

Public access to the Fouqué enclosure, from the Pas de Bellecombe trail or from any other trail, as well as landing aircraft in the volcano area, are prohibited until further notice.

Piton de La Fournaise - location on the OSO side, from the Piton de Bert camera, and OVPF map - one click to enlargePiton de La Fournaise - location on the OSO side, from the Piton de Bert camera, and OVPF map - one click to enlarge

Piton de La Fournaise - location on the OSO side, from the Piton de Bert camera, and OVPF map - one click to enlarge

Following an overflight of the eruptive site carried out with the assistance of the SAG and the PGHM, the cracks could be located with precision. Three cracks opened on the west southwest flank of the volcano, at an altitude of between 2300 and 2190 m and over a total distance of about 700 m.
During the overflight, between 7 a.m. and 7:30 a.m. local time, the three cracks were active, projecting lava fountains of about fifteen meters in height, accompanied by a significant degassing above the enclosure and much further towards the interior of the island. The flow front was spreading very slowly and was located at an altitude of about 2120 meters.

 

Source: OVPF / IPGP & Prefecture of Reunion

Piton de la Fournaise - 12/07/2020 - three cracks in echelons opened with strong degassing; fountains of about fifteen meters emanate from it - OVPF photos

Piton de la Fournaise - 12/07/2020 - three cracks in echelons opened with strong degassing; fountains of about fifteen meters emanate from it - OVPF photos

Piton de la Fournaise - 12/07/2020 - three cracks in echelons opened with strong degassing; fountains of about fifteen meters emanate from it - OVPF photos

Piton de la Fournaise - 12/07/2020 - three cracks in echelons opened with strong degassing; fountains of about fifteen meters emanate from it - OVPF photos

Piton de la Fournaise - 07.12.2020 - the cracks on the OSO side of the Dolomieu - photo rb / Imazpress Réunion

Piton de la Fournaise - 07.12.2020 - the cracks on the OSO side of the Dolomieu - photo rb / Imazpress Réunion

Piton de La Fournaise - 07.12.2020 - a lava rampart is built along one of the cracks - Photo OVPF

Piton de La Fournaise - 07.12.2020 - a lava rampart is built along one of the cracks - Photo OVPF

At Semeru, volcanic material deposited in the Kobokan drainage for 6 days is still very hot, and on December 6, there was heavy rains, causing a lahar around 3:30 p.m. WIB over 750 meters.

The BPBD has issued an alert for the community around the village of Sumberwuluh. Indeed, the embankment of the hamlet of Kebondeli has been eroded by previous lahars. If the 10 to 15 meter embankment is completely broken, it will endanger the safety of the inhabitants of the residential areas it protects.

Semeru - 06.12.2020 - descent of a hot lahar - moodyscape photo / via Rizal - Twitter

Semeru - 06.12.2020 - descent of a hot lahar - moodyscape photo / via Rizal - Twitter

Thanks to the seismographic records of December 6, 2020, it was recorded:

- 6 eruption earthquakes, amplitude of 10-18 mm lasting 50-70 sec.

- 26 collapse / avalanche earthquakes

- 3 blast / emission earthquakes

- 8 episode of harmonic tremor.

- 1 deep volcanic earthquake

- 3 distant tectonic earthquakes

- 1 earthquake associated with the hot lahar, with an amplitude of 5 mm, lasting 1200 sec.

 

Sources: PVMBG, Magma Indonesia, BPBD

Semeru - 06.12.2020 - a small gap in the clouds allows images of the activity in progress by Sentinel-2 L1C: summit incandescence and lava flow .- one click to enlargeSemeru - 06.12.2020 - a small gap in the clouds allows images of the activity in progress by Sentinel-2 L1C: summit incandescence and lava flow .- one click to enlarge

Semeru - 06.12.2020 - a small gap in the clouds allows images of the activity in progress by Sentinel-2 L1C: summit incandescence and lava flow .- one click to enlarge

The explosive-effusive eruptive activity continues at Klyuchevskoy in recent days. KVERT reports a gas / vapor / and ash plume on December 6 at 6,000 meters asl, drifting northeast for 60 km.

The measurement of thermal anomalies are disturbed by clouds.

 

Sources: KVERT, Sentinel, Mirova

Klyuchevskoy - image Sentinel-2 Nat. SWIR from 05.12.2020 via Antonio Vecoli

Klyuchevskoy - image Sentinel-2 Nat. SWIR from 05.12.2020 via Antonio Vecoli

Klyuchevskoy - Volcanic ash advisory on 06.12.2020 / 0600Z - Doc. VAAC Tokyo

Klyuchevskoy - Volcanic ash advisory on 06.12.2020 / 0600Z - Doc. VAAC Tokyo

Klyuchevskoy - thermal anomalies at 12.06.2020 / 01.55 a.m.- Doc. Mirova_MODIS_logVRP

Klyuchevskoy - thermal anomalies at 12.06.2020 / 01.55 a.m.- Doc. Mirova_MODIS_logVRP

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