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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

A VONA Orange was issued by magma Indonesia for the Bromo / Tengger caldera, this December 28 at 2:17 Z, following a gas emission with volcanic ash produced during an eruptive episode at 5:50 local time. An observer on the ground estimates the height of the ash cloud at about 2,820 meters asl.

Ash falls are reported in the Ngadirejo region, about 5 km northeast of the crater.

Seismic activity is characterized by a continuous tremor. Activity level is at 2 / waspada

 

Sources: Magma Indonesia and VAAC Darwin

Bromo - 12/27/2020 / 07:06 AM WIB - PVMBG Magma Indonesia webcam

Bromo - 12/27/2020 / 07:06 AM WIB - PVMBG Magma Indonesia webcam

The last eruption of Sinabung occurred on December 13, 2020. The observed plume is white, rising about 100 to 500 meters from the summit.

Thanks to seismographic recordings of December 27, 2020, it was recorded:

- 80 earthquakes of collapse

- 9 blast / emission earthquakes

- 22 low frequency earthquakes

- 19 hybrid / multiphase earthquakes

- 2 local tectonic earthquakes

- 1 distant tectonic earthquake

It is recommended that the community and visitors / tourists not carry out activities in the villages that have been displaced, as well as within a radial radius of 3 km from the summit of G. Sinabung, and a sector radius of 5 km for the south-eastern sector and 4 km for the east-north sector

 

Source: PVMBG

Sinabung - the summit dome on 12/27/2020 / 5:22 a.m. - photo Nachelle Homestay

Sinabung - the summit dome on 12/27/2020 / 5:22 a.m. - photo Nachelle Homestay

The lava lake in the Halemaʻumaʻu crater of Kilauea has changed little over the past day and was about 177 m (581 feet) deep and about 408 m (1340 feet) below the southern edge of Halemaʻumaʻu this morning ( December 27).

The volume of the lake remained around 21 million cubic meters (27 million cubic yards or 4.8 billion gallons). The most recent heat map indicated that the dimensions of the lake were 790 by 520 m (864 by 569 yds) for a total area of ​​29 ha (72 acres). The narrow ledge (10-30 m or 11-22 yd) around the lake was about 1-2 m (1-2 yds) above the active surface of the lake, suggesting that the surface of the lake dropped during of the last 2 days.

Kilauea Halema'uma'u - photo 12/27/2020 / 6:30 a.m. USGS

Kilauea Halema'uma'u - photo 12/27/2020 / 6:30 a.m. USGS

A preliminary analysis of the sulfur dioxide emission rates measured on the afternoon of December 26 shows that the rates are at around 5,000 tonnes / day around 40,000 t / d (December 21-23) and around 20,000 t / d ( December 25th).

Summit tiltmeters continued to record a weak inflationary tilt.

Seismicity remained high but stable, with regular high earthquakes and a few minor earthquakes.

 

During the last day, the cooler, solidified lava island floating in the lava lake slowly drifted west into the lake and remained stable in size - approximately 260m in length and 115m in width based on the heat map of December 23. This morning's measurements suggest that the island has risen 1 to 2 m since yesterday afternoon.

Kilauea Halema'uma'u lava lake - 12/27/2020 / 7:30 a.m. HST - photo M.Patrick USGS

Kilauea Halema'uma'u lava lake - 12/27/2020 / 7:30 a.m. HST - photo M.Patrick USGS

Kilauea Halema'uma'u - thermal anomalies at 12/27/2020 / 12:25 am - Doc. Mirova_MODIS_Latest10NTI

Kilauea Halema'uma'u - thermal anomalies at 12/27/2020 / 12:25 am - Doc. Mirova_MODIS_Latest10NTI

Kīlauea summit eruption reference map showing the location of current lake activity - HVO-USGS map 12/27/2020

Kīlauea summit eruption reference map showing the location of current lake activity - HVO-USGS map 12/27/2020

Geodetic monitors also indicate that the upper part of the East Rift Zone contracted as the summit deflated. This was associated with the removal of magma to feed the vents at the top.

A map shows the current state of the lava lake, and by superimposition, that of the acid water lake before the erption, and that of the previous lava lake (2008-2018) and suggests the contours of a possible overflow. of the current lava lake depending on the topography of the caldera.

 

Source: HVO-USGS

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