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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
Revenrador - Emission of gas and ash 16.04.2022 / 05:53 TL - Copeté /IGEPN webcam - one click to enlarge

Revenrador - Emission of gas and ash 16.04.2022 / 05:53 TL - Copeté /IGEPN webcam - one click to enlarge

The Reventador's activity level remains high on the surface and moderate internally.

Seismicity is characterized by 20 explosion earthquakes, 25 LP earthquakes, 13 episodes of emission tremor and 2 of harmonic tremor.

At the end of the afternoon of April 15, the volcano cleared and several emissions of steam, gas and ash could be observed with a maximum height of 800 meters above the level of the crater, heading towards the North-west.

VAAC Washington issued an advisory for 3 ash emissions 988 meters above the summit looking northwest.

This April 16 in the morning, the volcano cleared and ash emissions could be observed in the northeast, later it became cloudy.

 

Source: IGEPN

Sheveluch - volcanic ash advisory at 17.04.2022 / 01h25Z - Doc. VAAC Tokyo

Sheveluch - volcanic ash advisory at 17.04.2022 / 01h25Z - Doc. VAAC Tokyo

The growth of the Sheveluch lava dome continues on April 16 and 17, with strong fumarolic activity, and incandescence of the lava dome, and hot avalanches accompany this process.

On April 16, satellite data from KVERT showed explosions sending ash up to 5 km above sea level, with the ash cloud extending east-southeast of the volcano for 45 km.


KVERT satellite data from April 17 showed series of small explosions sending ash up to 4 km a.s.l., with the ash plume extending southeast from the volcano for 15 km.

The extrusive eruption of the volcano continues. Ash explosions up to 10-15 km (32,800-49,200 ft) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft.

 

Source: KVERT, KSCNET

Gunung Ruang / Sulawesi - Photo Magma Indonesia 14.04.2022 - one click to enlarge

Gunung Ruang / Sulawesi - Photo Magma Indonesia 14.04.2022 - one click to enlarge

Gunung Ruang in the Siau Islands, Sulawesi, was downgraded from level I (normal) to level II (alert), due to an increase in seismic activity. (Editor's note: clearly differentiate it from Gunung Raung, on the island of Java)

The seismicity of April 16 is characterized by:

- 97 deep volcanic earthquakes, with an amplitude of 5-55 mm, S-P 0.6-1.5 seconds and an earthquake duration of 5-25 seconds.
- 4 local tectonic earthquakes, with an amplitude of 45-47 mm, S-P 5-9 seconds and an earthquake duration of 30-45 seconds.
- 8 earthquakes were felt.
- 3 distant tectonic earthquakes, with an amplitude of 10-45 mm, S-P 12-14 seconds and an earthquake duration of 35-50 seconds.

Activity is at 2/waspada since April 16, 2022, with recommendation for communities around G. Ruang and visitors/tourists, who should limit their activities (not for long) and not stay overnight in the active area from the crater, and stay away from the gas vents around the crater to avoid potential toxic gas hazards.

 

Sources: PVMBG, Magma Indonesia

Piton de La Fournaise, summit cone - photo from the Piton de Bert trail / archives © Bernard Duyck

Piton de La Fournaise, summit cone - photo from the Piton de Bert trail / archives © Bernard Duyck

At Piton de La Fournaise, the OVPF has reported numerous rock falls in recent days, linked to bad weather which has weakened the structures. Between fifty events (in recent days) and 105 events (this 16.04) concerning the summit cone have been recorded.

The GPS of the summit zone and in the far field record inflation, witnessing the pressurization of a surface source and a deep source.
SO2 emissions remain below the detection limit
CO2 emissions from the ground are increasing in the distal sector and in the sector of the volcano deposit.

Seismicity remained reasonable.

In the eruption preparation phase, the supply of the magma reservoir continues.

 

Sources: OVPF preliminary activity bulletin as of 04.17.2022 & Réunion1ère

Piton de La Fournaise - Illustration of the deformation over 1 year / as of 15.04.2022. Here are shown baselines (variation of distance between two GPS receivers) crossing the Piton de la Fournaise building, at the top (top), at the base of the terminal cone (in the middle) and in the far field (bottom ) (see location on the associated maps). An increase is synonymous with elongation and therefore swelling of the volcano; conversely a decrease is synonymous with contraction and therefore deflation of the volcano. Any periods colored in light pink correspond to eruptions. - Doc. OVPF

Piton de La Fournaise - Illustration of the deformation over 1 year / as of 15.04.2022. Here are shown baselines (variation of distance between two GPS receivers) crossing the Piton de la Fournaise building, at the top (top), at the base of the terminal cone (in the middle) and in the far field (bottom ) (see location on the associated maps). An increase is synonymous with elongation and therefore swelling of the volcano; conversely a decrease is synonymous with contraction and therefore deflation of the volcano. Any periods colored in light pink correspond to eruptions. - Doc. OVPF

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