Overblog
Editer l'article Suivre ce blog Administration + Créer mon blog

Earth of fire

Actualité volcanique, Articles de fond sur étude de volcan, tectonique, récits et photos de voyage

Publié le par Bernard Duyck
 Sinabung - 04.19.2021 / 10:43 a.m. WIB - photo Sadrah Peranginangin via Beidar Sinabung

Sinabung - 04.19.2021 / 10:43 a.m. WIB - photo Sadrah Peranginangin via Beidar Sinabung

An eruptive episode was observed at Gunung Sinabung, North Sumatra, on April 19, 2021 at 10:43 a.m. with an ash plume at 2,000 m above the summit (± 4,460 m above sea level) leaning towards the South-East. This eruption is recorded by seismogram with a maximum amplitude of 42 mm and a duration of 3 min 50 sec.

Currently G. Sinabung is in Level III / siaga activity, with recommendations for visitors / tourists not to do activities on resettled villages, as well as within a radius of 3 km from the top of G. Sinabung, as well as 5 km of sector radius for the south-eastern sector, and 4 km for the east-north sector.

 

Source: Beidar Sinabung / Sadrah Peranginangin

Soufrière de St. Vincent - seismicity at 04/18/2021 / 04:08 am - Doc. UWI-SRC - one click to enlarge

Soufrière de St. Vincent - seismicity at 04/18/2021 / 04:08 am - Doc. UWI-SRC - one click to enlarge

The swarm of long-lived and hybrid earthquakes continues at La Soufrière in St. Vincent, with no significant change in their frequency of occurrence.
Occasional small volcano-tectonic earthquakes were still recorded. Its pattern of seismic activity over the past few days is typical of the growth and destruction of lava domes.

An explosion generated a high level tremor period starting at 4 p.m. 49 April 18.
The resulting eruption plume rose over 8 km and drifted south and southwest of the island.

An average SO2 flux of 232 and 391 tonnes per day, on April 17 and 18, respectively, was recorded.

 

Explosions accompanied by falling ash,
larger in size, may occur, with little or no warning, affecting St Vincent and neighboring islands.
The volcano remains at the Red alert level.

 

Source: UWI-SRC

Soufrière de St. Vincent - photo St. Vincent and the Grenadines ise online 18.04.2021

Soufrière de St. Vincent - photo St. Vincent and the Grenadines ise online 18.04.2021

Soufrière de St. Vincent - 18.04.2021 - Fieldwork on the leeward side of the red zone. Surge deposit in Richmond from the Wallibou River. The PDCs were located approximately 300 m from where this flow ended. Photo credit: Richard Robertson, UWI-SRC.

Soufrière de St. Vincent - 18.04.2021 - Fieldwork on the leeward side of the red zone. Surge deposit in Richmond from the Wallibou River. The PDCs were located approximately 300 m from where this flow ended. Photo credit: Richard Robertson, UWI-SRC.

The eruption that began on 04/09/2021 at 7 p.m. at Piton de La Fournaise (appearance of the tremor) continues. The intensity of the volcanic tremor (indicator of a surface lava emission) over the past 24 hours has remained relatively stable.

Piton de La Fournaise -: Evolution of the RSAM (volcanic tremor indicator) since 04/09/2021 on the FOR seismological station located at the level of the Château Fort crater (© OVPF-IPGP)

Piton de La Fournaise -: Evolution of the RSAM (volcanic tremor indicator) since 04/09/2021 on the FOR seismological station located at the level of the Château Fort crater (© OVPF-IPGP)

Observations of the eruptive site still show that the activity of lava fountains continues, mainly on the main cone located most upstream, and that the flow activity is focused on the plateau downstream of the eruptive site, with the setting in place of a lava tunnel regime showing numerous resurgences.

Over the last 24 hours, 22 superficial volcano-tectonic earthquakes (between sea level and the surface) have been recorded under the summit craters.

The deflation of the building seems to have stopped and a slight inflation of the top seems to be emerging. This parameter will be monitored over the next few days because it may correspond to the arrival of deep magma, highlighted by the flows of CO2 in the soil for several days, in the superficial magmatic reservoir which feeds the current eruption.

 

Source: OVPF

Piton de La Fournaise - 18.04.2021 / 06:01 local - webcam Piton de Bert / OVPF - IRT - one click to enlarge

Piton de La Fournaise - 18.04.2021 / 06:01 local - webcam Piton de Bert / OVPF - IRT - one click to enlarge

Commenter cet article

Articles récents

Hébergé par Overblog