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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
 Raung - 23.01.2021 / 17:21 WIB - webcam PVMBG Magma Indonesia

 Raung - 23.01.2021 / 17:21 WIB - webcam PVMBG Magma Indonesia

Raung - seismicity at 23.01.2021 - Doc. Magma Indonrsia

Raung - seismicity at 23.01.2021 - Doc. Magma Indonrsia

Since January 21, 2021, the activity level of G. Raung has been raised to level II (Waspada).

The main plume was observed to be gray with a height of about 200-600 meters above the peak.

The seismographic records of January 23, 2021 are characterized by:

• 27 blast / emission earthquakes

• 295 non-harmonic tremor episodes

• 2 distant tectonic earthquakes

People / visitors / tourists should not carry out activities within a radius of 2 km from the summit crater.

The last VONA sent with the color code ORANGE, published on January 23, 2021 at 4:20:00 PM WIB. The eruption is reported by an observer on the ground.

Andi Volcano at Raung

 

Sources: PVMBG, Magma Indonesia & VAAC Darwin


to see: Eruption Type of Raung Volcano, East Java - Indonesia - video Andi Volcano -

https: // youtube / ySRulDL6Suo

At Stromboli, the INGV notes a slow decrease in effusive activity fueled by the lava overflow in the area of ​​the north crater. At the moment, the casting is no longer supplied and is being cooled.

Also in the area of ​​the North crater, a spattering activity is observed. There are also no particular variations in the explosive strombolian activity of the north and central south crater areas.

On the morning of January 23, 2021, the amplitude of the tremor slowly decreases.

The amplitude of explosive events remains low and the frequency is also similar to the previous period, with an event every 5-10 minutes.

Stromboli returned to its normal activity patrameters on January 23 at 4:24 p.m. UTC.

 

Source: INGV OE

The erupting Stromboli seen aboard an Italian Air Force helicopter - video via Salvatore Sarpi 23.01.2021

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

Low-level fountaining from the west vent feeds a lava channel that drains into the lava lake in Halema'uma'u Crater.

The active western half of the lava lake was around 205m deep as of January 23, while the stagnant eastern half of the lake remains several meters below. The entire lava lake - including half that is stagnant - is perched / elevated at least 1-2m above the crust between the perched lake and the crater wall.

All of the islands have remained stationary for the past week, frozen in the stagnant eastern part of the lava lake. The dimensions of the main island have remained unchanged with its edges several meters above the surface of the lake.

The most recent measurements of sulfur dioxide emission rates from January 16 are around 2,500 t / d, lower than the pre-2018 lava lake emission rates (3,000 to 6,500 t / day). 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 / 23,01,2021 / 17:56 UTC

Kilauea - Halema'uma'u West vent - photo Bruce Omori / Extreme exposire / Paradise helicopters 17.01.2021

Kilauea - Halema'uma'u West vent - photo Bruce Omori / Extreme exposire / Paradise helicopters 17.01.2021

The Mayon volcano monitoring network recorded twenty-seven (27) volcanic earthquakes from 01.22 to 01.23 / 8 a.m. Moderate emission of steam-laden white plumes were observed that crept up the slope before drifting northeast.

The Mayon volcano monitoring network recorded seven (7) volcanic earthquakes during the 24 hour observation period, from 23.01 to 24.01 / 8am.

Sulfur dioxide emissions were last measured at an average of 676 tonnes / day on December 29, 2020.

Soil deformation data from the Precise Leveling surveys from November 28 to December 3, 2020 indicated a slight deflation of the building compared to October 2020. Electronic tilt data also showed short-term deflation of mean slopes since July 2020 after a period of irregular inflation from the end of 2019 to mid-2020. However, continuous GPS has recorded long-term inflation of lower to average slopes since July 2019. Overall, the Mayon Building is still inflated from baseline settings.

 

DOST-PHIVOLCS wishes to remind the public that the Mayon volcano is on alert level 1, which means it is in an abnormal state. While this means that currently no magmatic eruption is imminent, the public is strongly advised to refrain from entering the 6 kilometer radius Permanent Danger Zone (PDZ) due to the perpetual dangers threatening the life of rockfall, landslides / avalanches in the middle of upper slope, flashes of ash and steam or phreatic eruptions from the summit. Active stream / river channels and those identified as perpetually lahar-prone areas over all sectors of the volcano should also be avoided, especially in extreme weather conditions with heavy and prolonged rains.

 

Source: DOST-PHIVOLCS

Mayon - steam plume - photo archives © Thierry SLUYS / 02.2018

Mayon - steam plume - photo archives © Thierry SLUYS / 02.2018

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