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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
 Sinabung - 05.10.2021 / 07:47 - photo Armen Putra

 Sinabung - 05.10.2021 / 07:47 - photo Armen Putra

In Sinabung, on Sumatra, between the eruptions, a plume of white vapor and gas, of fine to medium intensity, is observed about 50-400 meters from the summit.

Seismicity is characterized by:
- 3 eruption earthquakes, with an amplitude of 20 to 50 mm, and the duration of the earthquake was 40 to 214 seconds.
- 196 avalanche / collapse earthquakes, with an amplitude of 2 to 120 mm and a duration of 25 to 243 seconds.
- 8 emisssion earthquakes, with an amplitude of 3 to 13 mm and the earthquake lasted 20 to 70 seconds.
- 4 low frequency earthquakes, with an amplitude of 2 to 9 mm and the earthquake lasted 10 to 25 seconds.
- 1 hybrid / multiphase earthquake
- 1 local tectonic earthquake

 

Sources: PVMBG, Magma Indonesia

Sinabung - 10.05.2021 / 8:05 am - photo Nachelle homestay

Sinabung - 10.05.2021 / 8:05 am - photo Nachelle homestay

The Kanlaon Volcano Monitoring Network recorded 5 volcanic earthquakes during the 24 hour observation period. To 10.05.2021 / 8 a.m. In three days, that increases that count to 11 volcanic earthquakes.

Moderate emission of white vapor-laden plumes was observed rising 300 meters before drifting northwest. Sulfur dioxide (SO2) emissions were measured at an average of 96 tonnes / day on May 8, 2021. Soil deformation data from continuous GPS and electronic tilt measurements record slight inflation of lower slopes and averages since June 2020. These parameters may indicate hydrothermal, tectonic or deep magmatic processes occurring deep beneath the edifice.

DOST-PHIVOLCS would like to remind the public that the Kanlaon volcano is on alert level 1, which means it is in an abnormal state and has entered a period of unrest. Local communities and the public are strongly reminded that entry into the permanent danger zone (PDZ) within a radius of 4 kilometers must be strictly prohibited.

 

Source: Phivolcs

Kanlaon - photo archives Negros traveling

Kanlaon - photo archives Negros traveling

The eruption of Fagradalsfjall continues, with the resumption of lava fountains on May 9.

The images taken by the Landsat 8 satellite in infra-red show that the active lava flow from vent # 5 is heading towards Meradalur.

 

Sources: Dr. Ev. Ilyinskaya and Landsat-8

Geldingadalur - Fountain at the vent 5 - 09.05.2021 / 09:50 - photo Dr. Ev. Ilyinskaya - one click to enlarge

Geldingadalur - Fountain at the vent 5 - 09.05.2021 / 09:50 - photo Dr. Ev. Ilyinskaya - one click to enlarge

Geldingadalur - vent # 5 - 09.05.2021 / 13h00 - webcam_langihryggur N

Geldingadalur - vent # 5 - 09.05.2021 / 13h00 - webcam_langihryggur N

Fagradalsfjall - Active lava flow towards Meradalur  - IR image Landat 8 USGS & Nasa earth observatory 09.05.2021

Fagradalsfjall - Active lava flow towards Meradalur - IR image Landat 8 USGS & Nasa earth observatory 09.05.2021

The eruption at Piton de La Fournaise, which began on 04/09/2021 at 7 p.m. (appearance of the tremor), continues. The amplitude of the volcanic tremor (indicator of a surface lava emission) continues its slow decrease that began on May 2. However, its amplitude remains significant, still reaching 40% of the maximum amplitude observed during this eruption on April 13.

The two cones are still active with a degassing which is always more marked at the level of the most downstream cone.

The flow of the lava at the exit of the eruptive vents, is done mainly in tunnels and this almost to the upper limit of the large slopes, where resurgences of lava are visible on the surface.

The flow front continues its slow progression in the Grandes Pentes and was located yesterday at around 1200 m altitude.

The CO2 fluxes in the soil are still increasing in the far field (Plains region) and decreasing in the near field (Volcano Gîte) suggesting that the deep recharge is continuing. The slight inflation (swelling) of the summit zone continues, which testifies to a pressurization of the surface reservoir in accordance with its recharge by deeper magma.

 

Source - OVPF - press release of 05.09.2021 / 11:15 a.m.

Piton de La Fournaise - the eruptive site on 05.10.2021 / 08:17 - OVPF pano webcam - one click to enlarge

Piton de La Fournaise - the eruptive site on 05.10.2021 / 08:17 - OVPF pano webcam - one click to enlarge

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