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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
Anak Krakatau - 02.01.2019 - photo Planet Labs Inc. via BBC

Anak Krakatau - 02.01.2019 - photo Planet Labs Inc. via BBC

After a brief lull, a strong explosive activity resumed at Anak Krakatau with the beginning of the year.

In a video made by the correspondent of Volcanodiscovery on 1 January 2019, cypressoid explosions are observed, with ejection of ashes, debris, water and steam several hundred meters away, as well as surges totally covering the island of Pajang, which now hides the view of the Krakatau.

Anak Krakatau - surtseyenne activity from 01.01.2019 - video of Doni Janskulo, Volcanodiscovery correspondent.

Anak Krakatau - Volcanic Ash Advisory for January 2nd and 3rd, 2019 - Doc.VAAC Darwin - One Click to EnlargeAnak Krakatau - Volcanic Ash Advisory for January 2nd and 3rd, 2019 - Doc.VAAC Darwin - One Click to Enlarge

Anak Krakatau - Volcanic Ash Advisory for January 2nd and 3rd, 2019 - Doc.VAAC Darwin - One Click to Enlarge

The VAAC Darwin reported on January 2, 2019 an ash plume that reached an altitude of 12,000 meters, and intermittent and regular emissions of ash up to 10,000 meters.

The eruption of Mount Anak Krakatau on 3 January 2019 at 12:03 WIB is characterized by a column of ash observed at ± 1,600 m above the summit (± 1,710 m above sea level), black , thick and leaning to the north and northeast. This eruption is recorded on a seismogram of maximum amplitude of 31 mm and a duration of ± 1 minute 10 seconds.
 
At present, G. Anak Krakatau is at Level III (Alert), with an orange VONA, and recommendations not to approach the crater within 5 km.
 
Sources: PVMBG, Magma Indonesia, Volcanodiscovery, VAAC Darwin

Lewotolo - archive image 07.2013 / Dan Quinn

Lewotolo - archive image 07.2013 / Dan Quinn

On 2 January, the PVMBG reported the level of Lewotolo at 2 / waspada due to an increase in volcanic earthquakes and fumarolic activity.
Since December 29, 2018, the seismic network has recorded 4 seismic swarms, a superficial earthquake and three deep volcanic earthquakes, indicating a possible magmatic intrusion
The Lewotolo is a stratovolcano located on an elongated peninsula, connected to the island of Lembata, in the sea of ​​Flores (small islands of Sunda); his last eruption was in January 2012.
 
Sources: PVMBG, Magma Indonesia

Lewotolo - seismicity on 02.01.2019 - Doc. Magma Indonesia

Lewotolo - seismicity on 02.01.2019 - Doc. Magma Indonesia

The last week of 2018 in Sabancaya / Peru was marked by a moderate eruptive activity, with an average of 23 explosions per day, and plumes of gas and ash reaching a maximum height of 3,300 meters above the crater, before reaching scatter 30 km to the east and west.
The seismicity is marked by LP earthquakes, related to fluid movements, and hybrid earthquakes, associated with the rise of the magma.
Two thermal anomalies were recorded, between 1 and 3 MW.

Source: I.G. Peru - OVI- Ingemmet

Sabancaya - activity from 24 to 30.12.2018 - Doc. I.G. Peru - OVI- Ingemmet

Sabancaya - activity from 24 to 30.12.2018 - Doc. I.G. Peru - OVI- Ingemmet

In Guatemala, prolonged and sporadic passive ash emissions, forming small plumes, are observed at Turrialba on 1 and 2 January 2019. Incandescence is visible at the western crater during the night.

Seismicity is characterized by small volcanic earthquakes and tremor.

Images from the Aura - IMO satellite indicate a substantial reduction in sulfur dioxide flux during the last half of 2018.

A few falls of ashes are reported in the Central Valley.

Poas - a low level lake and two active smokers - webcam Ovsicori 26.12.2018 / 11:38

Poas - a low level lake and two active smokers - webcam Ovsicori 26.12.2018 / 11:38

A small eruption occurred on January 2nd at 10am at Poas, accompanied by a column 50 meters above the crater; it lasted 2 minutes.

Ovsicori reports that these small eruptions of water vapor, magmatic gases and fine sediments are less frequent.

The crater lake, gray in color, has a low water level. Two smokers are active, one under water (mouth a), the other subaerial (mouth b, or sulfur). A general decrease in the emission of magmatic gases is noted in early January.

Source: Ovsicori

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