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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 - 05.23.2021 / 5:49 am WIB - photo PVMBG / Magma Indonesia

 Sinabung - 05.23.2021 / 5:49 am WIB - photo PVMBG / Magma Indonesia

A gray eruptive plume was observed at Sinabung 700-1000 m high from the summit. A hot avalanche occurred with a sliding distance of 2500 m to the east southeast. Avalanches were observed with a sliding distance of 1000 m to the east and south-east.

On May 13, 2021, it was recorded:
- 5 eruption earthquakes
- 14 earthquakes of pyroclastic flows. Between 7:37 p.m. and 9:30 p.m. WIB, 8 earthquakes of max. of 120 mm, lasting 197 to 443 sec. Travel distance could not be observed due to fog. ; and 2 other episodes between 10:17 p.m. and 10:32 p.m. WIB.

 

Sinabung - earthquakes marking unobservable pyroclastic flows - photo Armen Putra


- 148 collapse / avalanche earthquakes
- 11 emission earthquakes
- 2 low frequency earthquakes
- 30 hybrid / multiphase earthquakes
- 1 remote tectonic earthquake
- 2 times the earthquake, flood quakes

Communities and visitors / tourists should not conduct activities in the villages that have been displaced, as well as the location within a radial radius of 3 km from the summit of Mount Sinabung, and a sector radius of 5 km for the south -is sector, and 4 km for the east-north sector.

 

The activity level remains at 3 / siaga, and the Vona is orange, released on May 13, 2021 at 05:59:00 WIB. Volcanic ash was observed at an altitude of 3460 m above sea level or about 1000 m above the summit.

 

Sources: PVMBG & Magma Indonesia

Sinabung - the damage observed to crops - photos Sadrah Peranginangin - one click to enlarge
Sinabung - the damage observed to crops - photos Sadrah Peranginangin - one click to enlarge

Sinabung - the damage observed to crops - photos Sadrah Peranginangin - one click to enlarge

 Sinabung - l'activité se poursuit ce 14.05.2021 / 01h10 - photo Beidar Sinabung

Sinabung - l'activité se poursuit ce 14.05.2021 / 01h10 - photo Beidar Sinabung

Satellite images reveal features in the 2021 crater of La Soufriere volcano that appear to be mostly rubble. The visible pattern (round lines) probably reflects the morphology of the rubble (ie subsidence, depressions and mounds). At this point, scientists can't say for sure that there are no vents, but there are no clear features in these images that definitely look like a dome or a vent. The source of the gas plume remains uncertain. We continue to monitor and investigate.
(Credit: Edna Dualeh University, Leeds. ASI / CEOS Volcano Demonstrator.)

La Soufrière of St. Vincent - top morphology on 11.05.2021 - Doc. Edna Dualeh University of Leeds. ASI-CEOS Volcano Demonstrator. - one click to enlarge

La Soufrière of St. Vincent - top morphology on 11.05.2021 - Doc. Edna Dualeh University of Leeds. ASI-CEOS Volcano Demonstrator. - one click to enlarge

According to the latest UWI report, seismic activity at La Soufrière, St Vincent has remained low since the earthquake linked to the explosion and the ash dump of April 22.
Over the past 24 hours, seismic activity has been limited to a few long-lived earthquakes.
Gas measurements on May 11 gave an average SO2 flow of 252 tonnes per day.
The volcano continues to be in a state of turmoil. Escalation of activity can take place with little or no warning.

 

Sources: UWI-RSC & Leeds Univ.

Piton de La Fournaise - eruptive site on 12.05.2021 / 3:30 p.m. - flyby via © SAG-PGHM

Piton de La Fournaise - eruptive site on 12.05.2021 / 3:30 p.m. - flyby via © SAG-PGHM

At Piton de La Fournaise, the amplitude of the volcanic tremor (indicator of an emission of lava on the surface) continues its slow decrease that began on May 2.

The images of the cameras of the OVPF and the OVPF / IRT of the last 24 hours, as well as the images taken by the SAG and the PGHM during an overflight yesterday around 3:30 p.m. show that: the two cones are still active with strong degassing. The lava level in the two cones is now very low, and the most downstream cone has closed considerably compared to the day of May 11.

The most downstream cone projects lava fountains at 5 minute intervals to a height of 5-6 m above the cone.

the flow of lava at the exit of the eruptive vents is mainly in tunnels up to the upper limit of the large slopes, where lava resurgences are sometimes visible on the surface; the flow front continues its slow progression in the Grandes Pentes, it was yesterday around 3:30 p.m. at an altitude of 920 m

The CO2 fluxes in the soil are always increasing in the far field (Plains region). However, over the last 48 hours, no significant deformation has been recorded.

 

Source: OVPF - press release of 05/13/2021 / 1:15 p.m.

Piton de La Fournaise - the flow front during the overflight of 12.05.2021 - Doc OVPF / SAG / PGHM

Piton de La Fournaise - the flow front during the overflight of 12.05.2021 - Doc OVPF / SAG / PGHM

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