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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

At Sinabung, the lava dome, observed from the Kotatonggal River and the S. Laborus Natural Dam in the Sukanaliu River, shows steady growth ... it seems that the dome protrudes more and more towards the east-south opening. is.

The PVMBG reports for January 29:

- 1 eruption earthquake, with an amplitude of 25 mm and an earthquake duration of 147 seconds.

- 82 collapse / avalanche earthquakes, with an amplitude of 2 to 115 mm and a duration of 20 to 383 seconds.

- 15 emission / blast earthquakes

- 2 episodes of non-harmonic tremor

- 11 hybrid / multiphase earthquakes.

 

Sources: PVMBG, Magma Indonesia

Sinabung - the dome on 01.28.2021 - photo Sadrah Peranginangin

Sinabung - the dome on 01.28.2021 - photo Sadrah Peranginangin

Sinabung- Lava Dome on 01.28.2021 - We have been monitoring the situation of the lava dome of the Kotatonggal river and the natural S. Laborus dam in the Sukanaliu river, showing steady growth ... it seems that the dome protrudes more in addition to the east-south-east opening. - Indonesian Volcano Video

In Merapi, the morphological analysis of the summit area based on photos of the southwest sector from January 26 to January 21, 2021 shows that there is a change in the morphology of the peak area due to avalanche activity. and the development of new lava domes. (see photos from yesterday's article)

On January 25, 2021, the measured volume of the 2021 lava dome is 157,000 m³. Then on January 28, 2021, it was reduced to 62,000 m³ mainly due to avalanche activities and pyroclastic flows that occurred on January 26 and 27, 2021.

The deformation of Mount Merapi which was monitored by EDM this week showed a shortening rate of 0.4 cm / day, down from the previous week.

 

Source: BPPTKG

Merapi - control flight over the zone affected by pyroclastic flows, - Doc. BPPTKG 28.01.2021

Merapi - control flight over the zone affected by pyroclastic flows, - Doc. BPPTKG 28.01.2021

Merapi - seismicity at 29.01.2021 - Doc. BPPTKG

Merapi - seismicity at 29.01.2021 - Doc. BPPTKG

Mauna Loa is not erupting and remains at the Advisory Alert level. This alert level does not mean that an eruption is imminent or that progression to the eruption from the current level of unrest is certain.

Last week, around 60 low magnitude earthquakes were recorded below the upper elevations of Mauna Loa; most of them occurred at depths of less than 8 kilometers. The largest recorded earthquake was an M2.6, just southwest of the summit caldera, on January 24 at 10:39 a.m. HST.

Global Positioning System (GPS) measurements show continued slow inflation at the summit, consistent with the supply of magma to the volcano's shallow storage system.

The gas concentration at the sulfur cone monitoring site remains stable (less than 2 ppm SO2). The fumarole temperature was around 90 degrees Celsius. This value is within the normal range.

 

A flight over on Friday morning shows the summit of the volcano covered in snow. (Paradise helicopters / Bruce Omori and Mick Kalber)

Snow in Hawaii! Take a virtual helicopter ride over Mauna Kea's snowy summit! This morning (January 28, 2021) Mick Kalber, Bruce Omori, Matt Mannion, Andrew Hara and Tim Coakley flew over Mauna Kea and took in it's beautiful snowy summit

The Kīlauea volcano is erupting. Its USGS volcano alert level is at WATCH.

Lava activity is confined to Halemaʻumaʻu with lava erupting from a vent on the northwest side of the crater. On January 28 afternoon, lava filled about 209 m of Halema'uma'u crater and only the western part of the lava lake is active.

Sulfur dioxide emission rate measurements taken on January 23 were approximately 2,200 t / d, below the range of lava lake emission rates before 2018.

The summit inclinometers are on an inflationary trend. Seismicity remains high but stable, with high and regular earthquakes and a few minor earthquakes.

 

Source: HVO-USGS

The eruption at the top of Kīlauea continues with the western vent supplying lava to the active western lava lake of Halema'uma'u. Snow from a recent storm can be seen on the summit of Mauna Loa volcano in the upper left corner of the image. - photo M.Patrick - USGS

The eruption at the top of Kīlauea continues with the western vent supplying lava to the active western lava lake of Halema'uma'u. Snow from a recent storm can be seen on the summit of Mauna Loa volcano in the upper left corner of the image. - photo M.Patrick - USGS

Kilauea - Halema'uma'u la ce lava - 01.29.2021 / 9:30 p.m. HST - A north-south trending line of shallow fissures divides the boundary between the active western part (left) and the stagnant eastern part (right) of the lake of Halema'uma'u lava. Lake depth measurements taken on January 28 on both sides of the cracks (near the center) indicate that the eastern part of the lava lake is 4 meters (13 feet) lower than the western part of the lava lake - HVO webcam

Kilauea - Halema'uma'u la ce lava - 01.29.2021 / 9:30 p.m. HST - A north-south trending line of shallow fissures divides the boundary between the active western part (left) and the stagnant eastern part (right) of the lake of Halema'uma'u lava. Lake depth measurements taken on January 28 on both sides of the cracks (near the center) indicate that the eastern part of the lava lake is 4 meters (13 feet) lower than the western part of the lava lake - HVO webcam

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