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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
  Ili Lewotolok - activity of 02.13.2021 / 8:11 p.m. WITA - photo Jeffry Puget / PVMBG

 Ili Lewotolok - activity of 02.13.2021 / 8:11 p.m. WITA - photo Jeffry Puget / PVMBG

The seismicity of Lewotolok is characterized on February 13 by:

- 10 eruption earthquakes, with an amplitude of 3 to 23 mm and the duration of the earthquake was 16 to 35 seconds.

- 5 blast / emission earthquakes, with an amplitude of 2 to 12 mm and the earthquake lasted 15 to 30 seconds.

- 1 non-harmonic tremor episode with an amplitude of 4 mm and an earthquake duration of 177.5 seconds.

- 4 episodes of continuous tremor, with an amplitude of 0.5-1.5 mm, dominant 0.5 mm.

- 8 low frequency earthquakes

- 5 distant tectonic earthquakes

A white-gray plume is observed 1,000 meters above the summit.

 

The total number of earthquakes has halved from the previous week.

The activity remains at 3 / siaga.

 

Source: PVMBG

Kanlaon - opinion of Phivolcs on 13.02.2021

Kanlaon - opinion of Phivolcs on 13.02.2021

In the Philippines, the Kanlaon Volcano Monitoring Network recorded seven volcanic earthquakes in the past 24 hours.

Moderate emission of vapor-laden white plumes was observed which rose 500 meters before drifting southeast and northwest.

Sulfur dioxide emissions were measured at an average of 1130 tonnes / day on February 13, 2021.

Soil deformation data from continuous GPS and electronic tilt measurements record slight inflation of the lower and middle slopes since June 2020. These parameters may indicate hydrothermal or magmatic processes occurring deep below the edifice.

 

DOST-PHIVOLCS wishes 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 due to other possibilities of sudden and dangerous eruptions caused by steam or phreatic.

 

Source: Phivolcs

Fuego - image Sentinel-2 bands 12,11,5 of 13.02.2021 - Doc. Insivumeh

Fuego - image Sentinel-2 bands 12,11,5 of 13.02.2021 - Doc. Insivumeh

A special Insivumeh bulletin reports an increase in the effusive activity of Fuego from 9 p.m. on February 13, 2021, the incandescent materials are emitted at a height of 200 meters, accompanied by noises due to the decompression of the gases, and feed a new lava flow in the direction of the barranca Seca. Boulder avalanches occur at the lava front of the two flows.

The explosive activity generates an ash plume at 4,500-4,800 m. asl., moving in a west-southwest direction. The ashes could affect La Aurora International Airport.

 

Sources: Insivumeh and VAAC Washington

Fuego - volcanic ash advisory for 13.02.2021 - doc. VAAC Washington / Insivumeh

Fuego - volcanic ash advisory for 13.02.2021 - doc. VAAC Washington / Insivumeh

In Pacaya, the seismic parameters testify to a further increase in activity from 2 p.m. local on February 13.

The Mackenney crater expels incandescent materials at 300-400 m. high, and a plume of ash and gas is observed at 3,000 m. high, drifting north and west for 6 km.

Ash falls are reported on Santa Elena Barillas, and Mesillas, with a possible assignment of the Aurora airport.

Pacaya National Park remains closed, and a precautionary notice has been issued for civil aviation.

 

Source: Insivumeh

Pacaya - image Sentinel2 bands 12,11,5 of 13.02.2021 - Doc. Insivumeh

Pacaya - image Sentinel2 bands 12,11,5 of 13.02.2021 - Doc. Insivumeh

Pacaya - thermal image FLIR 13.02.2021 - Doc. Univ. Bristol via W. Chigna

Pacaya - thermal image FLIR 13.02.2021 - Doc. Univ. Bristol via W. Chigna

The volume of the dome of La Soufrière in St. Vincent is now estimated at 6.83 million m³, for 618 m in length, 232 m in width and 90 m in height, growing.

The most active gas emissions are at the contact areas between the pre-existing 1979 dome and the 2020-2021 dome, as well as at the top of the new dome.

Damage to vegetation, due to acid gases emitted by the growing dome, downstream from the summit, continues to be observed.

Falling blocks on the sides of the new dome are recorded by seismographs, and observed.

New seismic monitoring equipment was provided by the USGS through the Volcano Disaster Program.

 

Source: UWI-SRC & NEMO

Soufriere of St. Vincent - the domes in the crater - photo NEMO 02.12.2021

Soufriere of St. Vincent - the domes in the crater - photo NEMO 02.12.2021

Soufrière de St. Vincent - fumaroles at the new dome - photo 12.02.2021 / Chasford Sandy via NEMO SVG

Soufrière de St. Vincent - fumaroles at the new dome - photo 12.02.2021 / Chasford Sandy via NEMO SVG

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