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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
Kilauea, Halema Vent Ouest - 01/14/2021 / 7.15am HST - USGS photo taken by K. Lynn - USGS

Kilauea, Halema Vent Ouest - 01/14/2021 / 7.15am HST - USGS photo taken by K. Lynn - USGS

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

This morning, January 15, the lava lake has a depth of about 199 m and remains stagnant on its eastern half. SO2 emission rates remain high. The low fountain in the west vent feeds a lava channel that drains into the lava lake at Halema'uma'u Crater.

The active western half of the lava lake was about 199m deep on January 15, while the stagnant eastern half of the lake remains several meters below. The entire lava lake - including half of it stagnant - is perched at least 1-2m above the crust between the perched lake and the crater wall. All of the islands have been stationary for the past week as if frozen in the stagnant parts of the eastern lava lake. The dimensions of the main island have remained unchanged with its edges several meters above the surface of the lake.

 

Source: HVO-USGS 01.15.2021 / 18:58 UTC

Kilauea, Halema'uma'u West Vent - Brief (less than 20 minutes) changes in activity near the vent when part of the west vent projection cone collapsed on January 13, 2021. The first photo was taken seconds after the collapse at 5:06 p.m., showing the main lava spillway. Three minutes later, at 5:09 p.m., a second vent to the east (right) sent a new flow of lava to the side of the projection cone. This ephemeral (short-lived) flow remained active until 5:25 p.m. - photo N. Deligne / USGS

Kilauea, Halema'uma'u West Vent - Brief (less than 20 minutes) changes in activity near the vent when part of the west vent projection cone collapsed on January 13, 2021. The first photo was taken seconds after the collapse at 5:06 p.m., showing the main lava spillway. Three minutes later, at 5:09 p.m., a second vent to the east (right) sent a new flow of lava to the side of the projection cone. This ephemeral (short-lived) flow remained active until 5:25 p.m. - photo N. Deligne / USGS

The activity of Merapi between January 8-14, 2021 is reported by the BPPTKG:

Lava blocksls have been observed 128 times with a maximum slide distance of 900 meters southwest over the upper Kali Krasak. There were 2 pyroclastic flows, with a maximum slide distance of 600 m to the southwest (upstream of Kali Krasak).

Morphological analysis of the summit area, based on photos of the southwest sector from January 14 to January 7, 2021 shows a change in the morphology of the peak area due to avalanche activity and the development of new domes of wash. The new lava dome, referred to as "The Lava Change 2021" is located in the southwest sector of Mount Merapi around the 1997 Lava Cliffs.

On January 14, 2021, the measured volume of the lava dome was 46,766 m³ with a growth rate of approximately 8,500 m³ / day.

 The intensity of internal seismicity has decreased significantly this week compared to last week. Meanwhile, RF earthquakes that reflect lava avalanche activity from the eruption tend to be high.

The deformation of Mount Merapi, monitored using the EDM this week, showed a shortening rate of 6 cm / day. Over the past two weeks, the rate of distance shortening has shown a significant decrease.

The volcanic activity of Mount Merapi is still quite high in the form of effusive eruption activity. The activity status is defined at level 3 "siaga".

Current potential dangers in the form of lava avalanches and hot clouds in the South-Southwest sector include the Boyong, Bedog, Krasak, Bebeng and Putih rivers, with a maximum distance of 5 km. During this time, the ejection of volcanic material in the event of an explosive eruption can reach a radius of 3 km from the summit.

 Merapi - the summit and the domes on 01.11.2021 / 07:43 a.m. - photo IG Merapi uncover

Merapi - the summit and the domes on 01.11.2021 / 07:43 a.m. - photo IG Merapi uncover

Merapi - map of potential risks revised on 15.01.2021 - Doc. BPPTKG - one click to enlarge

Merapi - map of potential risks revised on 15.01.2021 - Doc. BPPTKG - one click to enlarge

Seismicity and activity from January 15th / 00:00 – 24:00

  • 104 collapse / avalanche earthquakes, with an amplitude of 3 to 60 mm and an earthquake duration of 15.8 to 78.4 seconds.

  • - 2 blast / emission earthquakes, with an amplitude of 3 to 15 mm, and the earthquake lasted 12 to 34.6 seconds.

  • - 74 hybrid / multiphase earthquakes, with an amplitude of 2-15 mm, S-P 0.3-0.5 seconds and the duration of the earthquake 5.4-9.1 seconds.

  • - 17 shallow volcanic earthquakes, with an amplitude of 30 to 75 mm and the duration of the earthquake was 11.3 to 28.6 seconds.

  • - 3 distant tectonic earthquakes, with an amplitude of 3 to 10 mm, S-P 18.96 seconds and an earthquake duration of 26 to 238 seconds. 

Sources : BPPTKG, PVMBG, Magma Indonesia

Merapi - 01.15.2021 - Incandescence of the dome, falling blocks, and fumaroles - very didactic and aesthetic photo by Øystein Lund Andersen

Merapi - 01.15.2021 - Incandescence of the dome, falling blocks, and fumaroles - very didactic and aesthetic photo by Øystein Lund Andersen

Shikhzekhirli mud volcano has erupted in Gobustan, Azerbaijan.

The Bureau of Earthquake Research reported that the volcanic eruption was characterized by three cycles of activity during the day. It was noted that the first active phase of the rash occurred at 17:48:36 local time and lasted almost three and a half minutes, the second phase started at 17:53:59 and lasted 2 minutes 18 seconds, and the third at 17:58:17 local time and lasted longer than the previous ones (7 minutes).

Due to volcanic activity, 2.5 hectares of land were completely covered with solid waste. A total of 1,700 cubic meters of waste was brought to the surface. The Shikhzekhirli mud volcano is not included in the state nature reserve. Bureau of Earthquake Research director Jeyhun Pashayev said it was the 25th volcanic peak, that is, spasmodic volcanic eruptions since 1810.

Azerbaijan is home to amazing and unique natural wonders. The Land of Fire has the largest number of mud volcanoes in the world, with 365 mud volcanoes. Most of the volcanoes are active and 43 of them are protected by the Azerbaijani Ministry of Ecology and Natural Resources.

 

 

Sources: Azernews and Lagazetteaz Azerbaijan

Azerbaijan - Shikhzekhirli / Gobustan mud volcano - photo Lagazettaz 01.15.2021

Azerbaijan - Shikhzekhirli / Gobustan mud volcano - photo Lagazettaz 01.15.2021

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