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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
Poas - laguna Caliente on January 8, 2021, with its turbulence - and FLIR thermal image of January 7, 2021 - photos Ovsicori / Maria Martinez
Poas - laguna Caliente on January 8, 2021, with its turbulence - and FLIR thermal image of January 7, 2021 - photos Ovsicori / Maria Martinez

Poas - laguna Caliente on January 8, 2021, with its turbulence - and FLIR thermal image of January 7, 2021 - photos Ovsicori / Maria Martinez

In Poas, the waters of the hyperacid lake, milky green in color, reached 40 ° C. During the day of January 7, the observation of small eruptions in the center of the lake produced the release of water vapor and gas, reaching up to 2 meters in height, through fumarole C, submerged.

The old NE / orange fumarole, outside the lake, becomes active again, at a temperature of 80 ° C, and deposits native sulfur on the ground.

Constant degassing marks the fumarole field on the eastern edge of the lake.

The seismicity on January 9 is stable with less than 150 episodes / day and occasionally a tremor of variable frequency and short duration.

The permanent deformation is stable, with a slight tendency towards inflation.

 

Sources: Ovsicori and Maria Martinez

Pacaya - 09.01.2021 / 11:26 - the volcano is cleared with a lava flow on the southwest flank -photo Conred and thermal image FLIR
Pacaya - 09.01.2021 / 11:26 - the volcano is cleared with a lava flow on the southwest flank -photo Conred and thermal image FLIR

Pacaya - 09.01.2021 / 11:26 - the volcano is cleared with a lava flow on the southwest flank -photo Conred and thermal image FLIR

At the Pacaya, thanks to Sentinel-2 images transmitted by Insivumeh on January 9, 2021, we see a hot spot at the Mackenney summit crater and an incandescent lava flow in a SW direction, about 1,500 meters long.

 

Sources: Insivumeh and Conred

Pacaya - Sentinel-2 bands image 12,11,5 of 09.01.2021 - Doc. Insivumeh

Pacaya - Sentinel-2 bands image 12,11,5 of 09.01.2021 - Doc. Insivumeh

Pacaya - thermal anomalies at 01.10.2021 at 5:00 a.m. - Doc. Mirova_MODIS_logVRP

Pacaya - thermal anomalies at 01.10.2021 at 5:00 a.m. - Doc. Mirova_MODIS_logVRP

At Merapi, in activity level 3 / siaga, the seismicity reveals to us this January 9:

- 1 earthquake, accompanied by a pyroclastic flow over 600 meters towards K. Krasak, and a seismogram trace with an amplitude of 45 mm and an earthquake duration of 120 seconds.

- 157 collapse / avalanche earthquakes, with an amplitude of 3-51 mm and a duration of 8-121 seconds. 26 boulder avalanches over a maximum of 800 meters are listed in the direction of K. Krasak

- 39 blast / emission earthquakes, with an amplitude of 3 to 7 mm and the earthquake lasted 10 to 81 seconds.

- 181 hybrid / multiphase earthquakes.

- 59 shallow volcanic earthquakes

- A distant tectonic earthquake.

 

Sources: BPPTKG and PVMBG / Magma Indonesia

Merapi - summary table of the activity of 09.01.2021 / 00-24h - Doc.BPPTKG

Merapi - summary table of the activity of 09.01.2021 / 00-24h - Doc.BPPTKG

In Kilauea, lava activity is confined to Halemaʻumaʻu Crater, with lava erupting from vents on the northwest side of the crater.

The lava lake was 194 m deep on Friday afternoon (January 8) and had a volume of over 27 million cubic meters; the dimensions of the perched lake were 760 by 470 m for a total area of ​​28 ha. As of Wednesday (January 6), the lake was still perched at least 1 to 2 m above its narrow edges along the western borders, but more of the eastern part of the lake appeared stagnant this morning with scabs of lava being gradually drawn below the surface of the liquid.

Kilauea - Halama'uma'u lava lake - the western vent on January 8, 2021 (spatter cone), with a small dome of fluid lava discharged below the surface. - photo Bruce Omori / Paradise helicopters - and Thermal anomalies at 08.01.2021 - Doc. Mirova
Kilauea - Halama'uma'u lava lake - the western vent on January 8, 2021 (spatter cone), with a small dome of fluid lava discharged below the surface. - photo Bruce Omori / Paradise helicopters - and Thermal anomalies at 08.01.2021 - Doc. Mirova

Kilauea - Halama'uma'u lava lake - the western vent on January 8, 2021 (spatter cone), with a small dome of fluid lava discharged below the surface. - photo Bruce Omori / Paradise helicopters - and Thermal anomalies at 08.01.2021 - Doc. Mirova

Sulfur dioxide emission rate measurements taken on Wednesday January 6 were 3,400 t / d - still in the 3,000 to 6,500 t / d range (the same range of lava lake emission rates from before 2018) since December 27. Summit tiltmeters have recorded a weak deflationary tilt since January 1, with a brief but temporary acceleration of the deflationary trend overnight between January 6 and 7. Seismicity remained high but stable, with regular earthquakes and a few minor earthquakes.

The western vents glow from the top of two small cones taped to the northwest wall of Halema'uma'u crater. During the past 24 hours, lava flowed from the western vents through a channel encrusted in the lake.

The main island of colder, solidified lava floating in the lava lake shifted very slightly eastward while the 11 smaller islands remained stationary at the eastern end of the lake. The dimensions of the main island remained around 250 m in length, 135 m in width and around 3 ha in area (according to the heat map of January 5). Measurements on Friday afternoon (January 1) showed the edges of the island to be about 6m above the lake surface. Friday afternoon (January 8), the western end of the island measured 9 m with the highest point 23 m above the surface of the lake; the island may be going up.

 

Source: HVO-USGS

Kilauea - Halema'uma'u - helicopter flight from 07.01.2021 / 10:30 am - Tribune Herald

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