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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 - phreatic eruption from 07.01.2019 / 14h38 - Ovsicori photos
 Poas - phreatic eruption from 07.01.2019 / 14h38 - Ovsicori photos

Poas - phreatic eruption from 07.01.2019 / 14h38 - Ovsicori photos

In Costa Rica, more or less intense phreatic activity has marked the acid lake of Poas, or what remains of it, since the beginning of January.

On January 7th, at 14:37, an eruption was accompanied by a plume 50 meters above the crater; it was generated by mouth A, located on the site of the ancient dome.

On January 8th, two phreatic episodes were observed at 7h and 9h40. The Ovsicori informs of "frequent phreatic eruptions throughout the morning.

Source: Ovsicori

 Poas - phreatic activity from 03.01.2019 / 7:40 - webcam Ovsicori

 Poas - phreatic activity from 03.01.2019 / 7:40 - webcam Ovsicori

 Poas - phreatic activity from 08.01.2019 / 9:40 - webcam Ovsicori

 Poas - phreatic activity from 08.01.2019 / 9:40 - webcam Ovsicori

At Turrialba, an eruption occurred on January 8, accompanied by a white plume 500 meters above the crater; passive emissions of discontinuous ash were more sustained than the previous days, and ash falls are reported on Heredia

Source: Ovsicori

Turrialba - 08.01.2019 / 10:20 - webcam Ovsicori

Turrialba - 08.01.2019 / 10:20 - webcam Ovsicori

At Anak Krakatau, the day of January 8th saw the Sutseyan eruptions continued, with gray and thick plumes reported by the PVMBG about 1,000 meters above the volcano, with a dispersion to the east.

At the seismic level, 61 eruption earthquakes, 11 blast earthquakes and continuous tremor of dominant amplitude at 4 mm were recorded.

The level of activity remains at 3 / siaga, with a 5 km forbidden zone around the crater, and an orange VONA.

Anak Krakatau - Sentinel image 2 bands 12,11,4 from 08.01.2019

Anak Krakatau - Sentinel image 2 bands 12,11,4 from 08.01.2019

Beautiful photos documenting the sutseyan eruption were shared by Sylvain Chermette / 80 days Travels.

The encounter between the magma and the seawater is reflected by its violent degassing, which fragmentation of magma under the effect of explosions; a chemical quench produces breccias called hyoloclastites. The fragmented lava forms plumes of black ash, called cypressoids plumes, accompanied by microdrops of condensed water vapor forming plumes up to several kilometers in altitude.

Anak Krakatau - Cupressoïde plume - surtseyan activity from 07.01.2019 - shared by  Sylvain Chermette / 80 jours Voyages

Anak Krakatau - Cupressoïde plume - surtseyan activity from 07.01.2019 - shared by Sylvain Chermette / 80 jours Voyages

Anak Krakatau - steam plume and blast - surtseyan activity from 07.01.2019 - shared by Sylvain Chermette / 80 jours Voyages

Anak Krakatau - steam plume and blast - surtseyan activity from 07.01.2019 - shared by Sylvain Chermette / 80 jours Voyages

Anak Krakatau - blast and column of fine ash - surtseyan activity from 07.01.2019 - shared by Sylvain Chermette / 80 jours Voyages

Anak Krakatau - blast and column of fine ash - surtseyan activity from 07.01.2019 - shared by Sylvain Chermette / 80 jours Voyages

Oystein Lund Andersen translated a second testimony about the day of the eruption and tsunami, interviewed by Lampung Tv, and that completes yesterday's one.

Another survivor, Puji, says that " the biggest explosion was not from the summit, but from the side of the volcano, then the summit collapsed.That explosion of the west flank caused the first collapse and the first wave, who smashed my boat; the sea smelled of sulfur and had the color of the coffee.A few moments after this first collapse, another happened on the east flank, and the sea water became hot. "- video link: https://youtu.be/Ampw9lUBOCY

Anak Krakatau - tsunami impact of 22.12.2018, reviewed on 07.01.2019 - Doc. Emergency response coordination Cente

Anak Krakatau - tsunami impact of 22.12.2018, reviewed on 07.01.2019 - Doc. Emergency response coordination Cente

The assessment of the tsunami reviewed on January 7 is 437 killed, 9,061 injured, 10 missing and 16,198 displaced.

Sources: PVMBG, Sylvain Chermette / 80 days trips, Lampung TV / translation by O.L.Andersen.

Karangetang - images Sentinel 2 Swir 07 (top) and 09.01.2019 (below) that show the progress of the lava flow. - one click to enlarge
Karangetang - images Sentinel 2 Swir 07 (top) and 09.01.2019 (below) that show the progress of the lava flow. - one click to enlarge

Karangetang - images Sentinel 2 Swir 07 (top) and 09.01.2019 (below) that show the progress of the lava flow. - one click to enlarge

The activity of the north crater of Karangetang / North sulawesi continues, with a lava flow that has lengthened and a thick plume seen about 100 meters above the crater.

The seismicity of January 8 is characterized by 55 earthquakes of eruption, 55 earthquakes of breath, an episode of harmonic tremor and a continuous tremor of dominant amplitude to 0,5 mm.

The level of activity is 3 / siaga, with a prohibited area of 2.5 km, extended to 3 km NW.

Sources; PVMBG, Mirova and Sentinel 2

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