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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

In Guatemala, effusive activity continues on January 2, 2021 at the Mackenney crater of Pacaya.

Lava flows on the western and southwest flanks, for about 400 meters, from the fissure on the side of the volcano.

The PCG and PCG5 seismic stations recorded the tremor associated with the rise of magma and the expulsion of gases.

Strombolian explosions reach a height of 200 meters, accompanied by degassing, and sounds of locomotives.

Source: Insivumeh

Pacaya - 12.30.202 - image Sentinel-2 bands 12.11.5 - Doc. Insivumeh

Pacaya - 12.30.202 - image Sentinel-2 bands 12.11.5 - Doc. Insivumeh

Pacaya - lava effusion - photo © Thierry Sluys 12.31.2020 - one click to enlarge.
Pacaya - lava effusion - photo © Thierry Sluys 12.31.2020 - one click to enlarge.

Pacaya - lava effusion - photo © Thierry Sluys 12.31.2020 - one click to enlarge.

Two eruptive episodes are reported on January 3, 2021 at Sinabung :

The first at 09:34 WIB with a thick plume of gray ash observed at ± 1000 m above the summit (± 3460 m above sea level). The plume disperses to the northwest. This eruption was recorded on a seismograph with a maximum amplitude of 55 mm and a duration of 143 seconds.

The second episode at 12:16 WIB, with no observation of the height of the ash plume. This eruption was recorded on a seismogram with a maximum amplitude of 20 mm and a duration of ± 3 minutes 1 second.

 

Source: PVMBG, Magma Indonesia

Sinabung - 03.01.2021 / 09:38 WIB - webcam PVMBG-Magma Indonesia

Sinabung - 03.01.2021 / 09:38 WIB - webcam PVMBG-Magma Indonesia

An eruptive episode occurred at Ili Lewotolok on Sunday January 3, 2021, at 8:30 a.m. WITA with an ash plume observed at ± 1000 m above the peak (± 2423 m above sea level). We observe that the ash column is white to gray with a thick intensity, dispersed towards the west. This eruption was recorded on a seismograph with a maximum amplitude of 30 mm and a duration of 70 seconds.

 

Source: Magma Indonesia

Lewotolok - 01.02.2021 - photo PVMBG

Lewotolok - 01.02.2021 - photo PVMBG

In Merapi, on Java, seismicity is increasing, with this January 2, 2021, 100 volcanic earthquakes, 467 hybrid earthquakes, 92 collapse earthquakes and 119 blast earthquakes.

The deformation of the dome is 21 cm.

The BPPTKG is reviewing the extent of its risk areas.

 

Source: BPPTKG

Merapi - morphological changes of the dome on 12/30/2020 - photos Sukiman Lintas Merapi
Merapi - morphological changes of the dome on 12/30/2020 - photos Sukiman Lintas Merapi

Merapi - morphological changes of the dome on 12/30/2020 - photos Sukiman Lintas Merapi

Merapi - seismicity and deformation at 02.01.2021 - Doc. BPPTKG

Merapi - seismicity and deformation at 02.01.2021 - Doc. BPPTKG

In Kilauea, the West Vent of Halema’uma’u Crater continues to erupt without significant change in recent days.

An incandescence is visible from the skylights above the vent and occasional splashes are ejected from these skylights. A weak spattering slowly formed a cone at the vents. The lava channel, which crusted several days ago, continues to supply the lake with lava, and the place where the lava is rising is marked by incandescent fine lines at night.

Kilauea, Halema'uma'u Lava Lake - 01/02/2021 1:30 a.m. HST (photo H. Dietterich) and 7:10 a.m. HST (photo) K. Mulliken) - USGS.
Kilauea, Halema'uma'u Lava Lake - 01/02/2021 1:30 a.m. HST (photo H. Dietterich) and 7:10 a.m. HST (photo) K. Mulliken) - USGS.

Kilauea, Halema'uma'u Lava Lake - 01/02/2021 1:30 a.m. HST (photo H. Dietterich) and 7:10 a.m. HST (photo) K. Mulliken) - USGS.

Kilauea - thermal anomalies at 02.01.2021 / 21h20 - Doc. Mirova_MODIS_Latest10NTI

Kilauea - thermal anomalies at 02.01.2021 / 21h20 - Doc. Mirova_MODIS_Latest10NTI

On January 2 at approximately 7:10 a.m. HST, the depth of the lava lake was measured at approximately 189 m, which has not changed significantly since yesterday afternoon. The splash cone, which was built by the now inactive north vent (center), is almost covered by the slowly rising lava lake in Halema'uma'u.

The most recent heat map (December 30) indicated that the dimensions of the lake were 800 by 530 m for a total area of ​​33 ha. The narrow ledge (10-30 m) around the lake was about 1-2 m above the active surface of the lake

Over the last day, the main island of cooler, solidified lava floating in the lava lake drifted west before settling in front of the western lava source around midnight, while a dozen or so other small islands remained relatively stationary around the eastern end of the lake. The main island was approximately 250 m in length, 135 m in width and approximately 3 ha in area according to the heat map of December 30. The surface of the island was about 6 m above the surface of the lake.

 

Source: HVO-USGS

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